The Regal 100 F-ED is quite good. It shines for terrestial viewing. The weak points are the lack of parfocality when zooming and the poor focuser stability. It is an excellent set of optimized optics. For astronomical viewing, a Telrad or other reflex finder is mounted on a thin steel plate parallel to the spotting scope. For best results you need an ultrastable tripod.
You will come to regard this twitchy little scope as your best buddy when viewing animals and landscapes and planets. If you want better performance then pay
$4000.00 for Zeiss optics. For the price here, it is a steal. (Posted on 4/28/12)
My background = 35+ years in optics and owner of some of the finest glass available. Bottom line as a spotting scope: if you can live with the size, suffice it to say that you would have to spend many times the price on Swarovsky to beat this scope. Bottom line as a telescope: compared side by side with Televue Pronto OTA + Zoom Hyperion Eyepiece and the Regal was better in all respects. I swapped eyepieces with the Hyperion and this eyepiece is better. The ability to quickly use any 1-1/4" eyepiece is very handy. The included camera adapter works very well. BEST FEATURE: micro focusing ability allows you to get the best out of this nice glass. THIS IS PERHAPS THE BEST ALL AROUND PERFORMER OUT THERE, VERY WELL THOUGHT OUT. Only negative is that after sales support could be better. (Posted on 12/15/11)
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An award-winning legacy brand for over 50 years, Celestron has grown to become the world’s leading telescope maker, and enjoys brand-name recognition among serious amateur astronomers for superior optics, outstanding design, and innovative technology. Celestron also develops a wide range of exciting products and technologies that enhance the science, outdoor and educational markets. At Celestron, we strive to inspire a sense of wonder, knowledge and fun in our customers and throughout our company.