Hello,
The seeing was quite poor last night, hovering around 4-5/10, so I thought I’d have a play with my home made Bahtinov Mask, as the detail on Jupiter and even the Moon at prime focus was washed out and watery.
Here is an image of a grossly over exposed Jupiter and 3 of his Galilean moons at the F12 prime focus (2160mm) of the Mewlon 180. With the correct exposure for Jupiter’s disc, there were 3 Jovian discs – the “real” one and a pair fainter facsimiles either side from the mask.
You can just make out the diffraction pattern from Jupiter’s washed out discs (all 3 of them due to the mask!)
Cheers
Dennis