If you want to reach deep the Stellarvue 13X80mm finder scope is the way to go. Gathering 130 times the amount of light you naked eye does, you will have no problem seeing those dimmer star clusters and nebulae. Weighing only 2.2 pounds, this finderscope is much lighter than other competitive 80mm finderscopes. All optics within this system are fully multicoated enhancing light transmission and contrast.
This finder-scope works with all of our standard 80 mm finderscope ring systems. The 80 mm finder-scope comes in a neutral matte black finish that goes well with any telescope regardless of color.
Included with each finderscope is our standard 23 mm, fully multi-coated cross-hair eyepiece, 1.25" helical focuser, rotating back (requires some finder re-alignment after rotation) and a fully multi-coated correct image erecting prism.
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At outreach events, I use the 80mm Stellarvue RACI mounted on my 8" Dob. 16mm ES 68 eyepiece gives 19x for a nice wide-field view, complements the Dob view for many targets.
I needed a 80 mm to 100mm RACI optical finder for my 28 inch f/4 Newtonian that was light weight and the Stellervue 80mm finder was exactly what I needed.I also got the 80 mm rings, which perfectly fit the 80 mm finder. I've observed two nights under dark skies with it and I'm a happy customer.
I have this mounted piggyback on a 120mm doublet on a CGEM. The standard finder was "okay," but was both inconvenient, ergonomically, as well as having, at best, barely passable views. I have also utilized a "Brand X" 80mm short tube, and it was a bit better. This finder, however, gives much better "views," is more compact, simpler to adjust for various viewing angles, and is a bit lighter, increasing positioning options. The views are good, the contrast is excellent, and mounted in my already-on-hand ADM MDS and rings, is definitely the a better option for me. Oh, yeah, did I mention the workmanship is top-rate and it looks terrific, too? :)