Istar 150mm h-alpha project

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Pablito
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Istar 150mm h-alpha project

Post by Pablito » Mon Aug 25, 2014 10:41 am

Hi,

I start making my solar scope :)

I have:
- Istar h-alpha optimized 150mm F10 lens,
- carbon fibre 160mm diameter tube (painted white)
- Lunt LS100 DS II PT etalon
- BelOptic 105mm sub-ERF

I already gave instructions to machine shop to make all the aluminium parts - objective adapter, baffles, etalon/focuser adapter.

Original Istar 150F10 refractors have ca.20cm of back focus. Isn't it too much? Usually refractors have ca.15cm of back focus.
However, Lunt DS II etalon has 40mm ERF and 36mm front collimating lens on etalon. With 20cm back focus, may cause loosing some lightcone baffled by original 40mm ERF. Extending the tube and cutting back focus a little would help but can it cause other problems?
Thanks in advance for your opinions :)
Etalon.jpg
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swisswalter
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Re: Istar 150mm h-alpha project

Post by swisswalter » Tue Aug 26, 2014 4:21 am

Hi Pawel

shortening the tube shouldn't give you terrible problems. Just make sure you have enough extension tubes when needed
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: Istar 150mm h-alpha project

Post by marktownley » Thu Aug 28, 2014 8:01 am

will the focal ratio of the Istar match the focal ratio of that 36mm collimating lens?
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http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Pablito
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Re: Istar 150mm h-alpha project

Post by Pablito » Thu Aug 28, 2014 9:16 am

Who knows ;)

My friend uses the same etalon with F9.5 apo and works great.

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Re: Istar 150mm h-alpha project

Post by marktownley » Thu Aug 28, 2014 9:30 am

Fair play, will be interesting to see how it turns out.
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http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Pablito
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Re: Istar 150mm h-alpha project

Post by Pablito » Tue Oct 07, 2014 8:44 pm

Project completed. Works great!!!

Details with pics soon :)

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swisswalter
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Re: Istar 150mm h-alpha project

Post by swisswalter » Wed Oct 08, 2014 4:43 am

Hi Pawel

congratulations
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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