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APM 107/700 APO has replaced WO ZS105ED as my primary imaging instrument. The objective diameter is 107mm and focal length 700mm giving an F6.5 system. For imaging I usually use it with Astro-Tech 2" field flattener, which works very well with this telescope and my cameras. This flattener corrects the telescope field curvature, which might be a problem when imaging with cameras with larger chips. When I want wider field (or lower F ratio), I use it with TS 2" 0.79 reducer/corrector instead, which gives F5.135 focal ratio and reduces focal length of the telescope to 553mm. Although much more elaborate (and expensive) reducers/correctors exist for this scope this one gives decent image quality also.
The telescope is very well built, suitable for both imaging and visual use. It is a high quality instrument for a reasonable price. I like its "classic" looks very much. The telescope is delivered with a hard case, tube rings and Vixen style dovetail bar (good thing that I equipped my GM-8 with head that accepts both Vixen and Losmandy dovetails). OTA is well baffled with knife-edge baffles and flat black paint, for high contrast and no reflections.
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