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Hi ColHut
I had a peek at Jupiter last night using a #80A blue filter, 7.5mm plossl with a 2x barlow in my 10"/f4.7 dob...this works out to 320x which is right at the limit!!!..I did manage to view a few steady images of the clouds formations though...swap the 7.5mm for a 15mm and the image is smaller of course but allowing the eye to adapt does provide good detail...I too have a...er...sr4mm which I use with the barlow..(600x) at school star nights and ask the kids if they can find the cheese shop on the Moon..I do cop some looks of disbelief though!!!...
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