Following some previous discussion here on the forum, I was thinking how to do aPST md on scope bigger than 180mm (biggest ERF on the market)
The idea was to use several small 2"UV/IR cut filter like an interferometry scope.
Loic (zordotnl) show us thatit looks feasable :
Our last french solar meeting last week was the right moment to try this on a C8 SCT using x3 2" UV/IR cut baader filter on a home made mask :
Previous night, star test surprisingly show us exactly the same expected picture. This tell us that most probably as said, 5 filter would be perfect to get a good enought picture.
We placed a pst body on its back protected by an other UV/IR cut filter (just in case):
Next sunny day, we place the scope on teh mount placing our hand on the focus point in order to make sure that IR cut was good.
1 filter : ok, no burning sensation
2 filters : ok, no burning sensation
3 filters : ok, no burning sensation
Lets place the now the PST black body!
First good news was that we could achieve the focus, but do to only 3 filters, the picture wasn't as good : on top of the expected sweet spot, we had a picture only on the 3 directions like this flower :
Even if weather condition were bad, we could achieve some shot between the clouds :
Next time I really think that it would be really interesting to try this with 5 filters!
PST mod1 on a C8 without ERF
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Re: PST mod1 on a C8 without ERF
Hi Vincent
a good start
a good start
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Re: PST mod1 on a C8 without ERF
Sorry, maybe you get a better result by putting in front to telescope an astrosolar Baader photographic sheet and behind, before the PST, an ERF by two inches?
Antonello
Antonello
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Re: PST mod1 on a C8 without ERF
I doubt : the astrosolar will block to much light!antonello wrote:Sorry, maybe you get a better result by putting in front to telescope an astrosolar Baader photographic sheet and behind, before the PST, an ERF by two inches?
Antonello
Re: PST mod1 on a C8 without ERF
Yes, I think you're right... I had not checked the transmission of a photographic Baader Astrosolar (T = 0.00015) ...
Unfortunately, it is sad to see the noticeable drop in quality with the three filters (but also with 5 filters, I think...) ...
Unfortunately, it is sad to see the noticeable drop in quality with the three filters (but also with 5 filters, I think...) ...
DSobserver wrote: I doubt : the astrosolar will block to much light!
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Re: PST mod1 on a C8 without ERF
I'm desagree with you :
we clearly see the chromosphere on the picture and it means that we have already a definition > 100mm scope!
Remember that the sky condition was a disaster between heavy clouds!
Regarding 5 filters, we know that it will boost the quality :
we clearly see the chromosphere on the picture and it means that we have already a definition > 100mm scope!
Remember that the sky condition was a disaster between heavy clouds!
Regarding 5 filters, we know that it will boost the quality :
Re: PST mod1 on a C8 without ERF
This is exactly what I wanted to say...DSobserver wrote: we have already a definition > 100mm scope!
Having a 200 mm and see as a 100 mm is not (for me) pleasant . (I have also a telescope Tal 100 mm, with internal etalon lunt, and I know exactly what I can do with him).
Naturally, my speech was not for belittle your tests...
Also I look with interest your experiments, useful if one has only a C8 ...
I wait with interest and curiosity to see the results with 5 filters.
Thank you.
Last edited by antonello on Sat May 23, 2015 5:47 am, edited 1 time in total.