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Cheap but optically very good, the SkyWatcher zoom eyepiece is a great "all around" eyepiece that provides very interesting performances especially considering the very low price!
You can gradually adjust the focal length from 7 to 21mm while the apparent field varies from 60° to 40°. This zoom eyepiece has a diameter of 31.8mm and the barrel is threaded to accept 31,8mm filters.
|Apparent field of view||da 40° a 60°|
|Eye Relief (mm)||No|
|Optical Coatings||Fully Multi Coated|
|Focal lenght (mm)||da 7 a 21mm|