Big C11 options....

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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Valery
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Re: Big C11 options....

Post by Valery » Sat Apr 04, 2015 10:59 pm

zorgdotnl wrote:It looks quite good with 5 holes (obstruction is 26%, small diameter is 37% full one), here it is:
It will work such as simulated in the case you place all small filters perfectly parallel. Otherwise there will be no single image
and no correct interference to create such a single image. Or there must be no glass in the holes.


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Re: Big C11 options....

Post by zorgdotnl » Sun Apr 05, 2015 10:26 am

+1 with Valery.
Stuff from the same batch.
I did some biblio. Here are some interesting simulations optimizing the sub apertures diameters, and relative positions (the 4 subs is interesting) I will run the psf on them when clouds come back ;)

I think DSobserver will have some stuff to test on his C11 ;)

http://laurent.mugnier.free.fr/publis/M ... SAA-96.pdf

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Re: Big C11 options....

Post by DSobserver » Thu Apr 09, 2015 11:41 am

Zorg

can you make a last simulation for a 200mm SCT using 5 and 7 2" IR cut filters like baader or astronomik one's?

Anyone against this idea if before eyepiece I place an last KG3 filter from beloptic for security reason?

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Re: Big C11 options....

Post by zorgdotnl » Thu Apr 23, 2015 3:51 pm

Some very interesting references if you want some clues about optimizing positions/sub apertures:
http://www.rop.cnrs.fr/IMG/pdf/F_Cassaing.pdf
https://tel.archives-ouvertes.fr/tel-00140049/document


I did the simulations: The five is still better ;)

Image

Image

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swisswalter
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Re: Big C11 options....

Post by swisswalter » Fri Apr 24, 2015 4:21 am

Hi loic

that looks good
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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from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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Re: Big C11 options....

Post by DSobserver » Tue May 19, 2015 8:28 pm

hello during our last french solar meeting we had the opportunity to try this new mod on a C8 SCT using x3 2" UV/IR cut baader filter on a home made mask :

Image

We placed a pst body on its back protected by an other UV/IR cut filter (just in case):

Image

Previous night, star test show exactly the results mentioned by zorgdotnl (that you can see on previous picture ;) )

Before placing our eyes we check that the 3 UV/IR cut filter were good enough to block IR filters : placing our hands on focus point we couldn't suffer any burning feeling.

The results on the sun were really interesting and we could get the focus.

I'll post some pictures as soon as possible....

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Re: Big C11 options....

Post by swisswalter » Wed May 20, 2015 4:17 am

Hi Vincent

that looks great
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 :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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