Orion Nebula M 42

I got my hands on a Kenko MIL TOL 400mm F6.7 ED lens. After testing it on stars visually, I couldn't resist attaching a camera. I had a 0.8x flattener, resulting in a 320mm focal length for APS-C format, with the field overcorrected (tails point toward the center). This is a frame rotated 90 degrees and cropped almost to the edge of the field.

Visually, the lens shows perfect spherical aberration in the out-of-focus region; in focus, it's a blurry spot, and there's also some coma present. I pushed it to 160x magnification. Mars shows a visible disk, and the Trapezium in Orion reveals four stars at 80x. Overall, it's a small, compact visual scope with the ability to take some photos.

What I liked is that I didn't have to rig anything up—I had an M48 to M42 adapter, which was enough to attach an M48/1.25" adapter for viewing and shooting.

The Moon, as usual, is almost full—a real floodlight. Just the right time for experiments.