The original viewfinder on our 127eq is difficult to calibrate. flipped the image so that navigation became an obstacle. and because we were so close, we kept banging on the lenses with telescopes and their handles. This scope made the search really important and enjoyable for us. Once you've calibrated it (easy to do with the Left/Right and Up/Down buttons), it locks into place and is set for the future, even if you inevitably start tapping. You keep your head on the end of the scope and simply look straight through the large glass hole and insert your target into the laser hole. don't blink, don't slap your cheekbones, and don't make trouble. That's all. extreme upgrade for us! Very satisfied. The only negative, if you can call it that, is the brightness. would really like to nerf it even more than its current minimum. Read other reviews to find the lens tint that suits your taste. but even that doesn't take away from how much we love the product. Thank you Celestron!
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