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Alex,
As a trial , I used a 2 x Powermate ( similar to Barlow ) in my 8” Newt down the coast back in 2020 to increase the focal length from 1000mm to 2000mm this making it an f10 focal ratio
I thought this would be a great idea and avoid the need for a bigger scope
Imaged Carina with 20 x 5 min subs on Gain 0
Unfortunately it was a total waist of time
The image had poor dynamic range, I stretched the crap out of it in Startools using both Film Dev and AutoDev and it was still quite dim and lacking fine detail
It proves that super long focal lengths need more Aperture to match to get that focal ratio down to f6 or below
My experiment with making my 8” an f10 Newt was useless for Astrophotography
Just thought I would share my experiences
Cheers
Martin
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