
I've owned several of these over the years and use them 90% of the time in place of my 7x50 finderscope (this is for the 5" refractor and 10.2" modified Maksutov). Perks include a wide star jump field and a reticle that shows me a scale in one-degree increments. The zoom viewfinder is still useful when looking for a Messier object that will appear blurry in such a viewfinder. As others have pointed out, it's larger than it should be. If attached to the bottom of the scope in hot climates for an extended period of time, the strap securing the scope to the scope may become loose and the Telrad will fall off. So I use elastic cords around the scope and through the Telrad (above the base) to make sure it stays in place. If you need more of this tape, just get double sided tape from your auto parts store (used for rearview mirrors). Telrad's Achilles heel are the four plastic tabs on the box that fit into the base. Eventually they tire and break. Then you have a choice: buy a whole new Telrad OR buy a plastic ruler (one of the toughest) and use a heat source like a soldering iron to cut out a rectangle of plastic from the ruler (use the remaining tabs). to show the size of the replacement) and place it in place, fusing its edges to the Telrad where the old one was. Back in business.

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