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Peter,
To work out my focal ratio for planetary imaging I use the following -
Focal Ratio for Lunar and Planetary Imaging
General rule of thumb to determine the “best focal ratio” of your image train for Lunar and Planetary imaging is -
Poor night of seeing 3.5 x pixel size of your camera
Average night of seeing 5 x pixel size of your camera
Good night of seeing 7 x pixel size of your camera
Canon 600D pixel size is 4.3 uM
Poor seeing 4.3 x 3.5 = 15
So focal ratio F15 required
Average seeing 4.3 x 5 = 21.5
So focal ratio F21.5 required
Good seeing 4.3 x 7 = 30.1
So focal ratio F30.1 required
My 6” f6 Bintel scope ( 900mm focal length )I use a 4 x or 5 x Televue Powermate
My 8” f5 Bintel scope ( 1000mm focal length ) 4 x or 5 x Televue Powermate
Seems to work Ok in the past few years
Just remember planetary imaging is more luck than skill
If your focal length is ok , Collimation is spot on and your well focused , the rest is up to how kind the atmosphere is to you and your nights imaging , hence the term “ Lucky Imaging”
Some really good planetary processing software to use is Autostakkert 3 for stacking your video files and Registax 6 for final sharpening , contrast and colour etc... they are very popular and do a great job
Cheers
Martin
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