[grimsay (Iain)]

Hi guys,

I just picked up a 5mm TMB eyepiece for use in my 8" f6 Dob. With the resulting 240x mag I keenly sought out Jupiter last night and patiently waited for Mars and Saturn to rise.

Seeing wasn't great but the images were reasonably sharpish. However, I found with viewing all 3 planets that there was a large semi-transparent overlay around the planet (see example graphic).

Can anyone shed some light on this for me?

Thanks, Iain