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
Istar 150mm h-alpha project
- swisswalter
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Re: Istar 150mm h-alpha project
Hi Pawel
shortening the tube shouldn't give you terrible problems. Just make sure you have enough extension tubes when needed
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
will the focal ratio of the Istar match the focal ratio of that 36mm collimating lens?
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!
Re: Istar 150mm h-alpha project
Who knows
My friend uses the same etalon with F9.5 apo and works great.
My friend uses the same etalon with F9.5 apo and works great.
- marktownley
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Re: Istar 150mm h-alpha project
Fair play, will be interesting to see how it turns out.
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!
- swisswalter
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Re: Istar 150mm h-alpha project
Hi Pawel
congratulations
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
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa