SVBONYSV191 Zoom Eyepiece for Telescope, 7.2-21.6mm Zoom Lens, Compatible with Telescopes That Accept 1.25 Inches Eyepieces

This Svbony SV191 zoom is well built and has a nice feel to it the views though this zoom is very sharp with good contrast to the edge of field of view with no edge distortion at all zoom setting. I found in my viewing at the 7.2 setting I was getting what seem to be around a 61 deg field of view not a full 64 deg but that's not a deal breaker for me but that's why it did not get a 5 star rating. In conclusion it's a very nice zoom the views of the Moon at 21.6mm to 7.2mm were very sharp with good contrast with lot of detail to be seen.

Very well finished and smooth zoom operation. Quite compact compared to the Baader zoom eyepiece but does not include the Baader's two different diameter nose pieces. Only the Pentax 6.5mm to 19.5mm zoom eyepiece is any smaller physically. Been too cold in Reno in mid winter to try it on the sky for now. Review may be revised once I can try it for astronomy viewing.

I bought this zoom eyepiece both for convenience and cost saving. With a zoom lens you don't have to switch lenses with varied power or buy multiple eyepieces. You get larger or smaller images with the turn of your wrist. The question was whether or not a zoom would provide the image quality of a stand-alone eyepiece. I'm no expert in telescope eyepieces, but I have been very pleased with the image quality of this zoom. The apparent field of view and eye relief are excellent as well.