![]() It's by far my most used eyepiece, although I also own a selection of quality fixed focal length eyepieces. This is much more expensive than those above, and not surprisingly outclassed all of them, both in sharpness/contrast and field of view. I therefore returned it without further testing. ![]() ![]() What disqualified it completely though was that it wasn't threaded for filters or screw in Barlows (the astro model is). In fact, none of these 4 zooms are parfocal (no refocusing required when changing power) to my aged eyes, but might be to someone younger. The first thing I noticed was that it was even less parfocal than my Baader. The version I bought was the spotting scope one, so it might be different to the astro model. I need to test it further at night when my binoviewers come back from repair, but will almost certainly keep it for the reasons given. Secondly, it's very small and light, even compared to other Svbony models, so I thought it might therefore be useful in binoviewers. I bought this firstly for outreach rather than risking my Baader zoom. However, trying it on prominences with my Quark it was way behind the Baader, seemingly because of lower contrast. Sharpness fell off somewhat off axis and the field of view was quite a bit smaller. I tested it on a very low down Saturn, and surprisingly found that on my f/6 refractor it was as good as the Baader on axis. Not compatible with a Dioptrx astigmatism corrector. I was planning to try it on the sun with my Quark, but there were no sunny days or clear nights before I passed it on to two of my grandkids to use with the 70mm f/10 I bought them for Xmas. Nor was it as sharp as the Baader in my f/6 refractor. Even though the focal lengths are lower, the actual field of view at 27mm is about the same as the Baader 8-24mm at 24mm. I compared it with my Baader during the day on my shed. Here are some thoughts on the zooms I've used so far:
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