This Barlow lens does not change focus when the eyepiece is attached, which is a great feature. It is of good quality with a metal tube, image sharpness is not bad. For the price, not a bad piece to add to your collection of 2" eyepieces. Buyer Tip: Some Barlow lenses on the market have a lot of focus distortion, which is annoying, especially when inserting the camera after looking at the image in the eyepiece .(The planets may not even appear in the image due to the focus being so far away).
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