Camera: 350D modified
Lens: Canon 400F5.6 Wide open
Mount: EM11USD3 manual guide, GA4
Guidescope: FS60C
Exposure: 5min x8
This is a test shot of the 400mm lens. It seems it is up to the job of providing a super lightweight option for digital medium focal length astrophotography. The stars are tight round up to the corners. It is reasonably fast at the price, size, and focal length.
This photo's guiding is off... the stars drifted all the 8 frames without an apparent reason. When I point the mount to another object, the problem was gone. I had to use post-processign to "cheat" the stars back to a round shape.
The image quality is just so-so because of the relatively short exposure time (I prefer at least a 2-hour shot for F5.6) and the misguided stars. The focus seems to be easier to reach compared to the F2 lens (due to the smaller aperture). But next time I still need to check it much more carefully.
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