- diffraction rings
- guide scope
I bought the ***** 80mm, f/11 refractor to be a guide scope for my Nikon, 500mm f/4 lens. The ***** optics were a most pleasant surprise. I notice no chromatic aberration on Jupiter, and just hint of "CA" on Venus and Sirius. Star images show textbook perfect diffraction rings. You can't go wrong with *****, as well as the prompt service you get from OPT.
The scope is just excellent for this price range. The optics are crystal clear compared to a Celestron 90mm I had. Very happy with purchase and happy I chose OPT telescopes. Shipped promptly and the scope in great condition on arrival. it was easy to set up and use the finder to zero in on my targets. The instructions were simple and clear. what more can you ask for? The included eyepieces seem very good quality. I may try to improve even more with accessories but lets' see how a clear moonlit night performs. Using it for astrophotography as its' main use. No CA apparent on daylight scenes. It was apparent with the Celestron.
Some things are really too good to be true and the ***** A80mf is one of them. I bought one and was very pleased with the views of double stars and nebulae. And then I decided to upgrade...not my scope, but the accessories. I went to Orion and bought a dielectric mirror diagonal and an Epic II ED 18mm eyepiece. My first light with this new rig was startling. I split double stars, saw definition in clusters and goodness, just had a ball. Every so often I'd say, Wow.? The Plossol eyepieces that come with the scope are fine, but my old eyes need a wider field of view. And that Orion dielectric diagonal? It made images razor-sharp. All in all, I think this scope, even without the accessories mentioned here, is a great value and I only wonder why ***** insists on saying it is not a kids scope. That put me off at first, but I read the specs and the long focal length made it clear that this would split double stars better than my wide-field reflector. I highly recommend this scope.
I purchased this OTA to use as a guide scope. Size wise it is about equal to my grab-and-go Orion 90mmEq. However, it has superior chroma free images on Jupiter and Luna. I fit it to the 90mm's mount and use it often. The only weak point to some may be the R&P, 1.25 focuser. I find it a pleasant scope to use with optics worth 3x what I paid.
bought as a grab and go scope.. and for public viewing...I do own a 100mm 4 TMB ED APO triplet and 80mm 3.1 Skywatcher ED APO but thought the fit and finish of the ***** 80mm was excellent...first light was Saturn and the moon..was shocked at the incredible sharpness and contrast this level entry scope produced.. almost no colour destortion...rings of Saturn showed incredible detail..lunar views were bright..crisp with so much fine detail..I did change the diagonal to an Orion dialectric...and also used higher end eyepieces... Far exceeded expectations...for the money....you won't go wrong..worth every dime....