Hello all - Doug here, after a break of roughly a decade I'm back running head-first down the imaging rabbit hole again.
Like athlete's foot, you never really shake the bug (or the itch) do you!?
To make myself useful returning to IIS I thought I'd post a comparison of similar objects imaged with and without the specific 0.7x reducer for the Askar FRA400 f5.6 refractor - a very popular imaging scope these days.
The reducer brings the 400mm FL f5.6 default scope down to 280mm FL f3.9.
Prior to purchasing the reducer I might have found a side by side comparison useful, so I hope this helps someone else's potential decision.
All Ha images taken with the Askar FRA400 f5.6 Quintuplet refractor.
All single 900sec subs hot off the 2600MM, quick 'lick and a promise' with NoiseXterminator then posted below.
Image 1: NGC3576 @ 400mm f5.6
Image 2: NGC3576 @ 280mm f3.9
Image 3: Cat's Paw @ 400mm f5.6
Image 4: Cat's Paw @ 280mm f3.9
Apologies - the 280mm images were taken through incoming clouds
- so those halos around the brighter stars have nothing to do with my lovely Chroma Ha 3nm filter (I hope)
I do like all that extra real estate the reducer affords - just need some good weather to use it.
All the best
Doug