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Stephane,
Lovely M42 , well framed and loads of fine detail
Well done !!
Your Astro imaging is growing at a fast rate, one of the fastest learners I’ve come across on the forum. Keep it going !!
Can’t help you with an f4 , I did warn you last year though , they are a different beast to an f5 !!
Maybe Ryan Jones or other folk can assist you with collimation etc…he’s uses an 8” f4 from memory
I’ll be sticking to f5 and f6 with my Newts. If I want to go wider field in the future when I’m really old , I’ll head down the refractor path
Cheers
Martin
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