well here it is sun omega bob caH
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well here it is sun omega bob caH
first and only one for now - see discussion in mod section
I think both Valery and Walter are correct
Ill play some more
I think both Valery and Walter are correct
Ill play some more
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Re: well here it is sun omega bob caH
Good first light, very similar to a Baader K - line.
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Re: well here it is sun omega bob caH
yes
I notice that even Walter's caH was more muted that his other ca shots
I notice that even Walter's caH was more muted that his other ca shots
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Re: well here it is sun omega bob caH
If you put two Bob's Ca H filters, the unwanted transmission will be totally blocked and the base of the transmission curve will
be almost 100% attenuated. The contrast will rise dramatically.
I believe, that Bob can borrow you a second filter for such an experiment.
Valery.
be almost 100% attenuated. The contrast will rise dramatically.
I believe, that Bob can borrow you a second filter for such an experiment.
Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
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Re: well here it is sun omega bob caH
Valery I mailed Bob - to try your idea
are you kind of sure about your Idea?
are you kind of sure about your Idea?
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Re: well here it is sun omega bob caH
I am quite sure in the reason I see what the contrast is so low.highfnum wrote:Valery I mailed Bob - to try your idea
are you kind of sure about your Idea?
I need to note also, that you will need to place your two filters
somewhat apart to exclude reflections, may be some tilts will help too.
Valery
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Re: well here it is sun omega bob caH
Hi John
a nice first light. I stick with the CaK
a nice first light. I stick with the CaK
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Re: well here it is sun omega bob caH
I agree, CaH is a little muted for me...swisswalter wrote:Hi John
a nice first light. I stick with the CaK
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Re: well here it is sun omega bob caH
Valery , Montana, Walter
Bob is send me another caH for DS
so I let you know when I have a chance
I hope Valery your on the money and thanks
Bob is send me another caH for DS
so I let you know when I have a chance
I hope Valery your on the money and thanks
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Re: well here it is sun omega bob caH
Oh dear, it looks just like a Baader K line which I already have. I am really starting to regret I ordered this.
Alexandra
Alexandra
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Re: well here it is sun omega bob caH
Montana
try to DS Kline and cah
I will report on ds asap
dont give hope just yet
try to DS Kline and cah
I will report on ds asap
dont give hope just yet
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Re: well here it is sun omega bob caH
OK Valery , Montana
1) Valery I did DS with caH I got a bit better contrast and some less noise
but it still nothing like a caK
2) Montana - I going to have to agree if you got a K line its basically the same
3) I will first post bob caK 2A filter as a reference - sky conditions were not great - so excuse softness - this is not a pretty picture post but a preliminary test posting
1) Valery I did DS with caH I got a bit better contrast and some less noise
but it still nothing like a caK
2) Montana - I going to have to agree if you got a K line its basically the same
3) I will first post bob caK 2A filter as a reference - sky conditions were not great - so excuse softness - this is not a pretty picture post but a preliminary test posting
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Re: well here it is sun omega bob caH
it appears caH gives a hint of what is to come in caK , if you look closely
have DS did help get better contrast in center area of sun
I found this to be my favorite
have DS did help get better contrast in center area of sun
I found this to be my favorite
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Re: well here it is sun omega bob caH
1) if expectations were for filter to do same as K or what Wah did
well it aint - stay with K
2) I have not seen any caH images with a filter that does what Wah did or what a caK filter does
3) walter's guess on performance was basically correct , Valery tip did correct some noise but not enhance basic image
4) any other tip are welcome
well it aint - stay with K
2) I have not seen any caH images with a filter that does what Wah did or what a caK filter does
3) walter's guess on performance was basically correct , Valery tip did correct some noise but not enhance basic image
4) any other tip are welcome
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Re: well here it is sun omega bob caH
highfnum wrote:1) if expectations were for filter to do same as K or what Wah did
well it aint - stay with K
2) I have not seen any caH images with a filter that does what Wah did or what a caK filter does
3) walter's guess on performance was basically correct , Valery tip did correct some noise but not enhance basic image
4) any other tip are welcome
The image "centercah.jpg" is VERY much like the image which Walter took with his 5A CaK and 6" (or 5" ?) refractor.
Walter's image is much sharper and a bit more contrasty. But the nature of the "surface" or "granulation" is very similar if
not the same. And it is different to what we can see at Ca K.
I think, that it is necessary to take pictures (with DS Ca H) in better conditions (seeing, telescope and camera) and only
then judge about the performance and if it worth to make such a filter to image the Sun at Ca H line.
In any case it is better significantly than K-line.
As for tip. I believe that Omega Bob's Ca K filter, if used as DS will work well. I saw the movie (however through tree's branches)
on Youtube. Contrast is OK and if the scale, seeing, telescope and camera will be appropriate, the results will be worth to look at.
Valery.
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Re: well here it is sun omega bob caH
To Stephen R.
Please, move this thread to the "Solar scopes modifications" forum. Then this thread will not sink.
Thanks,
Valery.
Please, move this thread to the "Solar scopes modifications" forum. Then this thread will not sink.
Thanks,
Valery.
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Re: well here it is sun omega bob caH
Valery thanks
so you think its a bit better than
Kline?
I agree I need more time with filter
so you think its a bit better than
Kline?
I agree I need more time with filter
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Re: well here it is sun omega bob caH
If you ever come to NY area for NEAF
Sent me a note
do you have link to Walters caH shots
Also I think you made few errors in the H K ca types
Sent me a note
do you have link to Walters caH shots
Also I think you made few errors in the H K ca types
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Re: well here it is sun omega bob caH
Probably, I will never come to NEAF or even the USA. I live in Ukraine, eastern Europe.highfnum wrote:If you ever come to NY area for NEAF
Sent me a note
do you have link to Walters caH shots
Also I think you made few errors in the H K ca types
I didn't any mistake concerning Ca H and Ca K.
Are you able (yourself only!!!), distinguish with confidence these two pictures? Which one is Ca K and which one is Ca H ?
Valery.
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Re: well here it is sun omega bob caH
Hard to tell
I guess second one is cak
cause it has more 'white'
I guess second one is cak
cause it has more 'white'
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Re: well here it is sun omega bob caH
Your guess is wrong! The second one (bottom) is the Ca II H.highfnum wrote:Hard to tell
I guess second one is cak
cause it has more 'white'
This simple experiment should tell you, that at a fairly narrow filter there is only a weak difference between the
K and H lines details wise.
So, when Bob will make Ca H filters narrow enough, about real 2A with well supressed base (around the peak itself)
of the transmission curve, then the Ca H filter will be useful in the same extent as the Ca K.
The Ca K seems better made by Bob and have abut 3A FWHM. Stacked as DS, the Ca K will, probably, work same
good as Lunt Ca K. Of course, they need to be more uniformly made.
On a final note - Bob's work seems not a hopeless. I personally hope, that he will reach a level when his filters will be
in use for a good reason.
I can give Bob my advise: make the main narrow filter (very narrow - 2A or even less) very near the 393nm area only
as the part #2 of the filter and the second element as the blocking filter #1 (ahead of the main filter).
The main filter can be as small as 12mm clear aperture, which will help to make them more uniform in transmission
across the aperture.
Valery.
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Re: well here it is sun omega bob caH
Thanks for all your work with this filter guys. I've moved the thread to the mods section.
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Re: well here it is sun omega bob caH
"In any case it is better significantly than K-line."
1) Valery why did you say that ?
I guess Montana and myself are not seeing a great difference from Baader K-Line
2) so your guess is that FWHM some where in 4A-6A area with this filter?(caH)
1) Valery why did you say that ?
I guess Montana and myself are not seeing a great difference from Baader K-Line
2) so your guess is that FWHM some where in 4A-6A area with this filter?(caH)
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Re: well here it is sun omega bob caH
highfnum wrote:"In any case it is better significantly than K-line."
1) Valery why did you say that ?
I guess Montana and myself are not seeing a great difference from Baader K-Line
2) so your guess is that FWHM some where in 4A-6A area with this filter?(caH)
1. Bacause I see much finer details in 5A Ca H line than at images with K-line 80A (!!!) filter.
The image made by Walter with 6" refractor and 5A Ca H is FUUUUUULL of fine details never imaged with K-line filter.
2. I guess it is about 4A FWHM. The problems are:
a) Poor seeing.
b) Equipment.
c) small scale
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Re: well here it is sun omega bob caH
Thanks Valery for always answering
sorry to hit you with so many questions
but I value the responses
And its a learning curve
sorry to hit you with so many questions
but I value the responses
And its a learning curve
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Re: well here it is sun omega bob caH
Don't worry. You are welcome. I learning here too. Wonderful TOS free solar site!highfnum wrote:Thanks Valery for always answering
sorry to hit you with so many questions
but I value the responses
And its a learning curve
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Re: well here it is sun omega bob caH
Hi Mark
thank you very much. We have to extend that discussion and it will take time. Another 12 days gone without having had even the chance to capture the disk very heavy dark side syndroms, I'm suffering
thank you very much. We have to extend that discussion and it will take time. Another 12 days gone without having had even the chance to capture the disk very heavy dark side syndroms, I'm suffering
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Re: well here it is sun omega bob caH
VALERY Would stacking another caH filter
3of them would make band more narrow
or does law of diminishing return
set in ?
3of them would make band more narrow
or does law of diminishing return
set in ?
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Re: well here it is sun omega bob caH
I don't think this is a good idea - to stack three Omega filters. Too expensive! Even two filters are too expensive cause it ishighfnum wrote:VALERY Would stacking another caH filter
3of them would make band more narrow
or does law of diminishing return
set in ?
possible to buy CaK PST or Lunt B600 for comparable or even less money and have CaK with narrow enough bandpass.
Valery
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Re: well here it is sun omega bob caH
well
I took a few tips from Valery to heart
1) CAh with extra element filter that bob sent me
2) increased FL now F30 for more parallel beam
BUT seeing conditions were horrible - sun looked like I was at bottom of a pool
high winds - i was forced to use my 60mm unitron which is pushing that little baby
none the less if you look close thru the mess
it looks like I have potential for a good image - surface looks more caked
I feel silly posting such a mush image but that is what I have now
I took a few tips from Valery to heart
1) CAh with extra element filter that bob sent me
2) increased FL now F30 for more parallel beam
BUT seeing conditions were horrible - sun looked like I was at bottom of a pool
high winds - i was forced to use my 60mm unitron which is pushing that little baby
none the less if you look close thru the mess
it looks like I have potential for a good image - surface looks more caked
I feel silly posting such a mush image but that is what I have now
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Re: well here it is sun omega bob caH
Hi John
bravo you went out despite the horrible seeing conditions. The result however is not convincing me
bravo you went out despite the horrible seeing conditions. The result however is not convincing me
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Re: well here it is sun omega bob caH
Well until weather breaks
I'm taking a break
it is just to fustrating
my answer is I dont know
I'm taking a break
it is just to fustrating
my answer is I dont know
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Re: well here it is sun omega bob caH
I have a question about daystar caH
this is mostly geared towards Walter
but anyone may chime in
why was 5.0A chosen instead of 2.0-3.0A like thier caK??
this is mostly geared towards Walter
but anyone may chime in
why was 5.0A chosen instead of 2.0-3.0A like thier caK??
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Re: well here it is sun omega bob caH
To make it visually usable for those, who can see this light, IMHO.highfnum wrote:I have a question about daystar caH
this is mostly geared towards Walter
but anyone may chime in
why was 5.0A chosen instead of 2.0-3.0A like thier caK??
First thing what you need to improve is the camera.
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Re: well here it is sun omega bob caH
Hi Johnhighfnum wrote:I have a question about daystar caH
this is mostly geared towards Walter
but anyone may chime in
why was 5.0A chosen instead of 2.0-3.0A like thier caK??
as simple as that, it was the only filter available. Soon I will receive Bobs CaH and can double stack
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Re: well here it is sun omega bob caH
Walter thanks for taking risk on this one
but I wanted to know why Daystar chose that bandwidth
but I wanted to know why Daystar chose that bandwidth
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Re: well here it is sun omega bob caH
I repeat for you: To make it visually usable for those, who can see this light. Ca K is worser for visual than Ca H.highfnum wrote:Walter thanks for taking risk on this one
but I wanted to know why Daystar chose that bandwidth
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