The crater Gassendi

A 114 km x 114 km crater in the south west quadrant of the moon that lies on the north edge of Mare Humorum. A sharper view would show lots of interesting formations on the floor of this crater.

Images taken with TEC-140 Telescope mounted on Losmandy G11 mount. Camera used was a Canon EOS20D. The image was taken using a 5x Powermate and eyepiece projection with a 13.8 mm SWA Plossl.

Five 25 second exposures aligned and stacked using ImagesPlus 2.50 beta and sharpened and dust and scratch filtered in Photoshop CS Note, ImagesPlus 2.10A was used for focus.

Due to the long apparent focal length of the imaging chain used here (~f/200), focusing was difficult. The camera also had some dust on the imaging sensor and removal of this also softened the image (note, the dark lines on the far right side show some of these dust lines).