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The tapered recess on the 1.25" barrel of a number of Baader Hyperion eyepieces is too big. This may interfere with your focuser's or diagonal's compression ring where the eyepiece cannot firmly be secured. If you use a setscrew or you use the 2" sleeve, then this does not apply.
If you have a moderately fast Newtonian reflector and feel in need of something in the way of an eyepiece upgrade, but don’t want to wear out the credit card too quickly, consider Orion’s Stratus eyepieces.
My acquaintance with zoom eyepieces dates back in 2001 with the purchase of my Leica 22-7.3mm Zoom for my Leica Apo-Televid 77. In 2003 I got my first astronomical telescope, a 115/805mm TMB/APM apochromat. The Leica Zoom was
I was struck with aperture fever and I sold that scope in order to purchase a mirror blank and material to make my own telescope. But I kept the good eyepieces. A few months later and my 12 inch reflector saw