The BF30 looks red when you look through it right?
The back side looks like a heat mirror or and multi coated AR.
There must be at least one piece of red glass inside. The red glass that's on the eyepiece side is there so that you won't be looking at your eye reflecting from the mirror of the blocker.
The front looks like the ITF.
Now if they use a blocker that has all the coating on one surface, then the front would be silver. The back would be red and it would only be one piece.
Mark W.
Hi Mark, the 2" BF30 when pointed at the Sun, no scope in the way(and with the 1.25" diagonal removed), the sun looks bluish. However, when the BF30 is put in the scope, with the Coronado front ERF/Etalon on the scope, the image looks red.
BF30
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Merlin66
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Re: BF30
Mark,
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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astroflyer
- The Sun?
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- Location: Newcastle, NSW, Australia
Re: BF30
I'm still surprised to see the blue reflections from that rear filter. Has anyone seen similar (on a blocking filter)??
I checked my BF10 & BF15 - both have blue front reflection & red rear filter.
All my blocking filters show a red image of the sun.
Same here.
Arek
LEAN BHUR ASHLIG
LEAN BHUR ASHLIG
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markmanner
Re: BF30
Mark,
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
If the weather ever improves, I will test it to confirm it works (without the 1.25" diagonal). As usual, I received the BF30 last Thursday, just in time for the last 4 days of cloud cover from the hurricane. Maybe this afternoon I can give it a proper test. I had about 30 sec of Sun last Friday, and got the scope setup, and saw red in the eyepiece for a few seconds. However, I saw no detail in the brief glimpse I had. Rainer, I assume your new BF30 also looks bluish on the eyepiece side, without the diagonal?
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
If the weather ever improves, I will test it to confirm it works (without the 1.25" diagonal). As usual, I received the BF30 last Thursday, just in time for the last 4 days of cloud cover from the hurricane. Maybe this afternoon I can give it a proper test. I had about 30 sec of Sun last Friday, and got the scope setup, and saw red in the eyepiece for a few seconds. However, I saw no detail in the brief glimpse I had. Rainer, I assume your new BF30 also looks bluish on the eyepiece side, without the diagonal?
-
brianb11213
Re: BF30
Mark,
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
The blocking filter that came with my Solarscope SF-100:
(a) looks like blue/green glass when viewed from the objective side
(b) has a peach coloured reflective coating on the eyepiece side
(c) obviously consists of multiple elements which are tilted, presumably to move reflections out of the field of view
(d) has a total thickness from the front of the first element to the rear of the last element of around one inch
(e) acts as a pale blue filter if looked through on its own. Transmission is quite high, my CdS photo exposure meter says 2.3 stops = approx. 20% over the visual band.
I presume what it is doing is acting as a minus red filter with a transmission spike to accommodate the wanted spike transmitted by the main etalon.
It does not need to block way-out-of-band transmissions because that job is done by the deep red full aperture ERF which is mounted at the very front of the etalon assembly.
I suspect the Coronado BF30 is built pretty much the same way ... though mine was supplied without a diagonal, it looks like a short 2" extension tube. Oh, and there's no sign of rust on mine.
With the etalon hung on the front of the scope but no BF fitted, if you point the scope at the sun and stick my hand in the beam I see a BRIGHT red spot of light which is not noticeably warm to feel. With the BF fitted, the prime focus image of the sun can no longer be seen by scatterring off skin ... so it is obviously removing quite a lot of the radiation transmitted by the etalon assembly. It does seem a little odd that it transmits such a lot of light when averaged over visual wavelengths but it does work.
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
The blocking filter that came with my Solarscope SF-100:
(a) looks like blue/green glass when viewed from the objective side
(b) has a peach coloured reflective coating on the eyepiece side
(c) obviously consists of multiple elements which are tilted, presumably to move reflections out of the field of view
(d) has a total thickness from the front of the first element to the rear of the last element of around one inch
(e) acts as a pale blue filter if looked through on its own. Transmission is quite high, my CdS photo exposure meter says 2.3 stops = approx. 20% over the visual band.
I presume what it is doing is acting as a minus red filter with a transmission spike to accommodate the wanted spike transmitted by the main etalon.
It does not need to block way-out-of-band transmissions because that job is done by the deep red full aperture ERF which is mounted at the very front of the etalon assembly.
I suspect the Coronado BF30 is built pretty much the same way ... though mine was supplied without a diagonal, it looks like a short 2" extension tube. Oh, and there's no sign of rust on mine.
With the etalon hung on the front of the scope but no BF fitted, if you point the scope at the sun and stick my hand in the beam I see a BRIGHT red spot of light which is not noticeably warm to feel. With the BF fitted, the prime focus image of the sun can no longer be seen by scatterring off skin ... so it is obviously removing quite a lot of the radiation transmitted by the etalon assembly. It does seem a little odd that it transmits such a lot of light when averaged over visual wavelengths but it does work.
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rsfoto
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Re: BF30
Mark,
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
Hi,
Well this got confusing now :woohoo:
My Old BF30 shows the Sun red when looking through ( NO additional diagonal anywhere)
My New BF30 shows the Sun bluish when looking through (NO additional diagonal anywhere)
Look at this posting the first 2 images http://solarchat.solarastronomy.org/ind ... s-new-bf30
By the way. At the very beginning I got a BF30 in which the 2 elements were loose and I remember when looking at them there was absolutely no red filter anywhere in there and also none of the 2 bluish filters had a mirrorlike coating anywhere.
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
Hi,
Well this got confusing now :woohoo:
My Old BF30 shows the Sun red when looking through ( NO additional diagonal anywhere)
My New BF30 shows the Sun bluish when looking through (NO additional diagonal anywhere)
Look at this posting the first 2 images http://solarchat.solarastronomy.org/ind ... s-new-bf30
By the way. At the very beginning I got a BF30 in which the 2 elements were loose and I remember when looking at them there was absolutely no red filter anywhere in there and also none of the 2 bluish filters had a mirrorlike coating anywhere.
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
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rsfoto
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Re: BF30
[quote]Mark,
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
If the weather ever improves, I will test it to confirm it works (without the 1.25" diagonal). As usual, I received the BF30 last Thursday, just in time for the last 4 days of cloud cover from the hurricane. Maybe this afternoon I can give it a proper test. I had about 30 sec of Sun last Friday, and got the scope setup, and saw red in the eyepiece for a few seconds. However, I saw no detail in the brief glimpse I had. Rainer, I assume your new BF30 also looks bluish on the eyepiece side, without the diagonal?
Hi Mark,
Yes, both surfaces have a bluish tint.
The really sounds very odd.
The function of the blocking filter is to "block" the etalon "spikes".
To do that effectively, it must be a very narrow band filter (around 6-7A max)centred on Ha wavelength. This results in seeing a red image through the filter.
All my blocking filters show a red image of the sun.
Does it actually work??
Rainer...do you agree??
If the weather ever improves, I will test it to confirm it works (without the 1.25" diagonal). As usual, I received the BF30 last Thursday, just in time for the last 4 days of cloud cover from the hurricane. Maybe this afternoon I can give it a proper test. I had about 30 sec of Sun last Friday, and got the scope setup, and saw red in the eyepiece for a few seconds. However, I saw no detail in the brief glimpse I had. Rainer, I assume your new BF30 also looks bluish on the eyepiece side, without the diagonal?
Hi Mark,
Yes, both surfaces have a bluish tint.
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
-
markmanner
Re: BF30
I just spoke with Meade customer service. The person there said the following:
1. The 1.25" diagonal with the new BF30 is NOT needed for operation. It is included as a convenience. The red filter in it is for contrast, and isn't part of the blocking filter.
2. The coatings on the blocking filter in the 2" BF30 unit itself have been changed, and that is why they look different than the old BF30 blocking filter.
I told the Meade person that the reason this has come up is that the casual view through the BF30 only is no longer reddish, like the old BF30s. He said he understood this, and the coating change explains it. I pressed him very hard on this issue, and on the need or not for the 1.25" diagonal. He was firm and without doubt in his statement that there is no need to use the 1.25" diagonal, unless you prefer the use of a 90degree diagonal rather than straight through.
I will test my unit hopefully this afternoon, sun willing.
Mark
1. The 1.25" diagonal with the new BF30 is NOT needed for operation. It is included as a convenience. The red filter in it is for contrast, and isn't part of the blocking filter.
2. The coatings on the blocking filter in the 2" BF30 unit itself have been changed, and that is why they look different than the old BF30 blocking filter.
I told the Meade person that the reason this has come up is that the casual view through the BF30 only is no longer reddish, like the old BF30s. He said he understood this, and the coating change explains it. I pressed him very hard on this issue, and on the need or not for the 1.25" diagonal. He was firm and without doubt in his statement that there is no need to use the 1.25" diagonal, unless you prefer the use of a 90degree diagonal rather than straight through.
I will test my unit hopefully this afternoon, sun willing.
Mark
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markmanner
Re: BF30
[quote]Mark,
.....The blocking filter that came with my Solarscope SF-100:
(a) looks like blue/green glass when viewed from the objective side
(b) has a peach coloured reflective coating on the eyepiece side
(c) obviously consists of multiple elements which are tilted, presumably to move reflections out of the field of view
(d) has a total thickness from the front of the first element to the rear of the last element of around one inch
(e) acts as a pale blue filter if looked through on its own. Transmission is quite high, my CdS photo exposure meter says 2.3 stops = approx. 20% over the visual band.]
Brian, this is a good description of the BF30--pale blue filter looked through on its own, with pretty high transmission. It seems that Coronado's BF30 is now being made similarly to the Solarscope blocking filter. I had my friend at Vanderbilt pull their Solarscope blocking filter out, and look through it alone, and he reports it looks pale blue as well. So, apparently the BF30 coatings/assembly is different from the BF15/10/5 units that are out there (and the older BF30s).
.....The blocking filter that came with my Solarscope SF-100:
(a) looks like blue/green glass when viewed from the objective side
(b) has a peach coloured reflective coating on the eyepiece side
(c) obviously consists of multiple elements which are tilted, presumably to move reflections out of the field of view
(d) has a total thickness from the front of the first element to the rear of the last element of around one inch
(e) acts as a pale blue filter if looked through on its own. Transmission is quite high, my CdS photo exposure meter says 2.3 stops = approx. 20% over the visual band.]
Brian, this is a good description of the BF30--pale blue filter looked through on its own, with pretty high transmission. It seems that Coronado's BF30 is now being made similarly to the Solarscope blocking filter. I had my friend at Vanderbilt pull their Solarscope blocking filter out, and look through it alone, and he reports it looks pale blue as well. So, apparently the BF30 coatings/assembly is different from the BF15/10/5 units that are out there (and the older BF30s).
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rsfoto
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Re: BF30
I just spoke with Meade customer service. The person there said the following:
1. The 1.25" diagonal with the new BF30 is NOT needed for operation. It is included as a convenience. The red filter in it is for contrast, and isn't part of the blocking filter.
2. The coatings on the blocking filter in the 2" BF30 unit itself have been changed, and that is why they look different than the old BF30 blocking filter.
I told the Meade person that the reason this has come up is that the casual view through the BF30 only is no longer reddish, like the old BF30s. He said he understood this, and the coating change explains it. I pressed him very hard on this issue, and on the need or not for the 1.25" diagonal. He was firm and without doubt in his statement that there is no need to use the 1.25" diagonal, unless you prefer the use of a 90degree diagonal rather than straight through.
I will test my unit hopefully this afternoon, sun willing.
Mark
Hi Mark,
Thanks for your efforts in talking to the MEADE people.
You forgot to ask :whistle: why does the New BF30 need 4x more exposure times then the old one :silly: and more then 5x when adding the red filter of the diagonal ...
Look at my posting http://solarchat.solarastronomy.org/ind ... s-new-bf30
where I depicted some images as well as copies of the Log file produced by Lucam Recorder software.
1. The 1.25" diagonal with the new BF30 is NOT needed for operation. It is included as a convenience. The red filter in it is for contrast, and isn't part of the blocking filter.
2. The coatings on the blocking filter in the 2" BF30 unit itself have been changed, and that is why they look different than the old BF30 blocking filter.
I told the Meade person that the reason this has come up is that the casual view through the BF30 only is no longer reddish, like the old BF30s. He said he understood this, and the coating change explains it. I pressed him very hard on this issue, and on the need or not for the 1.25" diagonal. He was firm and without doubt in his statement that there is no need to use the 1.25" diagonal, unless you prefer the use of a 90degree diagonal rather than straight through.
I will test my unit hopefully this afternoon, sun willing.
Mark
Hi Mark,
Thanks for your efforts in talking to the MEADE people.
You forgot to ask :whistle: why does the New BF30 need 4x more exposure times then the old one :silly: and more then 5x when adding the red filter of the diagonal ...
Look at my posting http://solarchat.solarastronomy.org/ind ... s-new-bf30
where I depicted some images as well as copies of the Log file produced by Lucam Recorder software.
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
-
markmanner
Re: BF30
Mark
Hi Mark,
Thanks for your efforts in talking to the MEADE people.
You forgot to ask :whistle: why does the New BF30 need 4x more exposure times then the old one :silly: and more then 5x when adding the red filter of the diagonal ...
.
Yes, I did! I suspect the answer is the changed coatings they are using. It definitely now seems to be similar to the Solarscope blocking filters, based on Brian's and my friend at Vanderbilt U. today.
Hi Mark,
Thanks for your efforts in talking to the MEADE people.
You forgot to ask :whistle: why does the New BF30 need 4x more exposure times then the old one :silly: and more then 5x when adding the red filter of the diagonal ...
.
Yes, I did! I suspect the answer is the changed coatings they are using. It definitely now seems to be similar to the Solarscope blocking filters, based on Brian's and my friend at Vanderbilt U. today.
-
colinsk
Re: BF30
He said he understood this, and the coating change explains it. I pressed him very hard on this issue, and on the need or not for the 1.25" diagonal. He was firm and without doubt in his statement that there is no need to use the 1.25" diagonal, unless you prefer the use of a 90degree diagonal rather than straight through.
Mark
Mark,
Can you supply your contacts name? I have not been able to find a person at Meade knowledgeable about H-Alpha systems. The last time I tried I was given the email address of an ex-employee that likely could have answered my questions. Not surprisingly he never replied.
Mark
Mark,
Can you supply your contacts name? I have not been able to find a person at Meade knowledgeable about H-Alpha systems. The last time I tried I was given the email address of an ex-employee that likely could have answered my questions. Not surprisingly he never replied.
-
markmanner
Re: BF30
[quote]He said he understood this, and the coating change explains it. I pressed him very hard on this issue, and on the need or not for the 1.25" diagonal. He was firm and without doubt in his statement that there is no need to use the 1.25" diagonal, unless you prefer the use of a 90degree diagonal rather than straight through.
Mark
Mark,
Can you supply your contacts name? I have not been able to find a person at Meade knowledgeable about H-Alpha systems. The last time I tried I was given the email address of an ex-employee that likely could have answered my questions. Not surprisingly he never replied.
Colin, I asked for someone who knew about Ha filters. He did give me his name, but for some reason I neglected to write it down, and I had to go into a meeting right after the call, and by the time I got out, I had forgotten it. Sorry!
Mark
Mark,
Can you supply your contacts name? I have not been able to find a person at Meade knowledgeable about H-Alpha systems. The last time I tried I was given the email address of an ex-employee that likely could have answered my questions. Not surprisingly he never replied.
Colin, I asked for someone who knew about Ha filters. He did give me his name, but for some reason I neglected to write it down, and I had to go into a meeting right after the call, and by the time I got out, I had forgotten it. Sorry!
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Merlin66
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Re: BF30
OK, it seems to work!
Does this mean a shift in technology? Will all the future BF's (Lunt and Coronado) be based on a similar ITF design?
Interesting days..
Rainer, I'd love to see the transmission spectrum of a BF15 v's the new BF30...
Does this mean a shift in technology? Will all the future BF's (Lunt and Coronado) be based on a similar ITF design?
Interesting days..
Rainer, I'd love to see the transmission spectrum of a BF15 v's the new BF30...
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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rsfoto
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Re: BF30
Mark
Hi Mark,
Thanks for your efforts in talking to the MEADE people.
You forgot to ask :whistle: why does the New BF30 need 4x more exposure times then the old one :silly: and more then 5x when adding the red filter of the diagonal ...
.
Yes, I did! I suspect the answer is the changed coatings they are using. It definitely now seems to be similar to the Solarscope blocking filters, based on Brian's and my friend at Vanderbilt U. today.
Hi Mark,
Thanks. Well that is bad as 4x more exposure time is really unacceptable ...
Hi Mark,
Thanks for your efforts in talking to the MEADE people.
You forgot to ask :whistle: why does the New BF30 need 4x more exposure times then the old one :silly: and more then 5x when adding the red filter of the diagonal ...
.
Yes, I did! I suspect the answer is the changed coatings they are using. It definitely now seems to be similar to the Solarscope blocking filters, based on Brian's and my friend at Vanderbilt U. today.
Hi Mark,
Thanks. Well that is bad as 4x more exposure time is really unacceptable ...
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
-
rsfoto
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Re: BF30
OK, it seems to work!
Does this mean a shift in technology? Will all the future BF's (Lunt and Coronado) be based on a similar ITF design?
Interesting days..
Rainer, I'd love to see the transmission spectrum of a BF15 v's the new BF30...
Hi Ken,
As I already wrote before that is bad as 4x longer exposure time is quite unacceptable ...
My tests already showed that the results are the same comparing the Old BF30 with the New BF30 without the red filter and as written the red filter even makes the exposure longer by about 3-4ms additionally.
http://solarchat.solarastronomy.org/ind ... s-new-bf30
I have no BF15 and I am waiting to get back the BF10 I bought for tests in July :whistle:
Does this mean a shift in technology? Will all the future BF's (Lunt and Coronado) be based on a similar ITF design?
Interesting days..
Rainer, I'd love to see the transmission spectrum of a BF15 v's the new BF30...
Hi Ken,
As I already wrote before that is bad as 4x longer exposure time is quite unacceptable ...
My tests already showed that the results are the same comparing the Old BF30 with the New BF30 without the red filter and as written the red filter even makes the exposure longer by about 3-4ms additionally.
http://solarchat.solarastronomy.org/ind ... s-new-bf30
I have no BF15 and I am waiting to get back the BF10 I bought for tests in July :whistle:
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
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rsfoto
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Re: BF30
Rainer, I am sorry, my reply was confusing. I meant that I did forget to ask about exposure time. However, I don't think that I see a 4x difference in exposure time between my BF15 and the BF30. I will test it and confirm it one way or the other.
Hi Mark,
I am not saying that there is a difference of exposure time between a BF15 and a BF30.
I am saying that there IS a 4x exposure time difference between an Old BF30 and a New BF30 (NO red filter added). The New BF30 with red filter added is even worse :blink: 16ms comparded to 12.7ms. Now imagine what that means when I add a 4x barlow and use the New BF30 ... Just unacceptable exposure times.
I have used the Old BF30 with 4x barlow and get exposure times of around 55 to 70ms (still 12frames per second). Now that would mean that with the New BF30 I get exposure times of 220 to 280ms and so ridiculous 3-4 frames per second which for Sun imaging is just unacceptable at all.
Look at the posted message link :woohoo:
Hi Mark,
I am not saying that there is a difference of exposure time between a BF15 and a BF30.
I am saying that there IS a 4x exposure time difference between an Old BF30 and a New BF30 (NO red filter added). The New BF30 with red filter added is even worse :blink: 16ms comparded to 12.7ms. Now imagine what that means when I add a 4x barlow and use the New BF30 ... Just unacceptable exposure times.
I have used the Old BF30 with 4x barlow and get exposure times of around 55 to 70ms (still 12frames per second). Now that would mean that with the New BF30 I get exposure times of 220 to 280ms and so ridiculous 3-4 frames per second which for Sun imaging is just unacceptable at all.
Look at the posted message link :woohoo:
regards Rainer
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°
Observatorio Real de 14
San Luis Potosi Mexico
North 22° West 101°