well here it is sun omega bob caH

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well here it is sun omega bob caH

Post by highfnum » Sat Jan 17, 2015 6:27 pm

first and only one for now - see discussion in mod section
I think both Valery and Walter are correct
Ill play some more
cah1.jpg

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Re: well here it is sun omega bob caH

Post by highfnum » Sat Jan 17, 2015 6:28 pm

Oh BTW Unitron 60mm F/15

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Re: well here it is sun omega bob caH

Post by marktownley » Sat Jan 17, 2015 6:28 pm

Good first light, very similar to a Baader K - line.
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Re: well here it is sun omega bob caH

Post by highfnum » Sat Jan 17, 2015 6:36 pm

yes
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

Post by Valery » Sat Jan 17, 2015 8:39 pm

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.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: well here it is sun omega bob caH

Post by highfnum » Sat Jan 17, 2015 9:30 pm

Valery I mailed Bob - to try your idea
are you kind of sure about your Idea?

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Re: well here it is sun omega bob caH

Post by Valery » Sun Jan 18, 2015 5:32 am

highfnum wrote:Valery I mailed Bob - to try your idea
are you kind of sure about your Idea?
I am quite sure in the reason I see what the contrast is so low.

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
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: well here it is sun omega bob caH

Post by swisswalter » Sun Jan 18, 2015 1:27 pm

Hi John

a nice first light. I stick with the CaK
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

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Re: well here it is sun omega bob caH

Post by marktownley » Sun Jan 18, 2015 7:04 pm

swisswalter wrote:Hi John

a nice first light. I stick with the CaK
I agree, CaH is a little muted for me...
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Re: well here it is sun omega bob caH

Post by highfnum » Mon Jan 19, 2015 2:28 pm

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 :bow

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Re: well here it is sun omega bob caH

Post by Montana » Mon Jan 19, 2015 3:16 pm

Oh dear, it looks just like a Baader K line which I already have. I am really starting to regret I ordered this.

Alexandra

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Re: well here it is sun omega bob caH

Post by highfnum » Mon Jan 19, 2015 3:53 pm

Montana
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

Post by highfnum » Sun Jan 25, 2015 6:50 pm

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
cakbobrerf12.jpg

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Re: well here it is sun omega bob caH

Post by highfnum » Sun Jan 25, 2015 6:51 pm

here is what I got with caH
cahf124inch.jpg

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Re: well here it is sun omega bob caH

Post by highfnum » Sun Jan 25, 2015 6:54 pm

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
centercah.jpg

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Re: well here it is sun omega bob caH

Post by highfnum » Sun Jan 25, 2015 6:56 pm

this is from Friday - caH spots near edge
dscaHfinal.jpg
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Re: well here it is sun omega bob caH

Post by highfnum » Sun Jan 25, 2015 7:00 pm

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

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Re: well here it is sun omega bob caH

Post by Valery » Sun Jan 25, 2015 7:30 pm

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.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: well here it is sun omega bob caH

Post by Valery » Sun Jan 25, 2015 7:32 pm

To Stephen R.

Please, move this thread to the "Solar scopes modifications" forum. Then this thread will not sink.

Thanks,

Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: well here it is sun omega bob caH

Post by highfnum » Sun Jan 25, 2015 7:51 pm

Valery thanks
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

Post by highfnum » Sun Jan 25, 2015 7:54 pm

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

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Re: well here it is sun omega bob caH

Post by Valery » Sun Jan 25, 2015 8:56 pm

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
Probably, I will never come to NEAF or even the USA. I live in Ukraine, eastern Europe.

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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"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: well here it is sun omega bob caH

Post by highfnum » Sun Jan 25, 2015 9:31 pm

Hard to tell
I guess second one is cak
cause it has more 'white'

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Re: well here it is sun omega bob caH

Post by Valery » Mon Jan 26, 2015 3:33 am

highfnum wrote:Hard to tell
I guess second one is cak
cause it has more 'white'
Your guess is wrong! The second one (bottom) is the Ca II H.

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.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: well here it is sun omega bob caH

Post by marktownley » Mon Jan 26, 2015 6:41 am

Thanks for all your work with this filter guys. I've moved the thread to the mods section.
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