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Interesting, the camera does block half of the aperture area—is that normal?

For the future, instead of a regular camera, an astro camera—is that okay?

Smirnov Andrey - The less light passes through the surface of the images, the better the quality.

niparon - closer to a physical explanation - Newtonian system, assembly of the optical tube, is not an original assembly of components, made of metal parts, misalignment, bending, etc. During visual observation, this has little effect on quality, but in astrophotography, unfortunately, defects become clearly noticeable. I'm not a theorist; since childhood, I've been used to doing everything on the fly.

You don't have a Newtonian system in stock—lucky you—so I decided to get rid of the secondary mirror and the focuser that was attached to the tin tube, as well as the corrector that causes glare. Time will tell what comes of it. Well, money and energy are always running out anyway.

But why without a focuser? The camera is screwed into the tube—that is the rack-and-pinion focuser, so everything is in its place.