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Tack Sharp Stars: Overcoming Eyesight Astigmatism (1/31/2019)
Phil Ressler's had never seen pinpoint stars before DIOPTRX™. "For people like me, DIOPTRX™ is arguably Tele Vue's most essential product, because it makes all of Al Nagler's original work in eyepieces and refractors unmistakably worthwhile to the astigmatic viewer." He tells us how it works: "just turn the DIOPTRX™ lens slowly until, in an instant, the star is bang-on tight, and the astigmatic elongation is just gone. Impressive!"
Enjoy the following sample comments sorted by astigmatism correction (some correctors mentioned may be discontinued and others added since this was compiled).
|TSP||A.D.||0.25||Slightly better, noticeable.|
|RTMC||B.P.||0.25||Makes a subtle difference.|
|TSP||J.S.||0.25||Noticeable but not huge.|
|RTMC||S.A.||0.5||I like it.|
|TSP||B.C.||0.5||At least as good as glasses.|
|CSSP||G.C.||0.5||An improvement over glasses.|
|TSP||P.C.||0.5||Greater contrast, finer resolution.|
|CSSP||W.C.||0.5||Great, a lot better.|
|CSSP||C.D.||0.5||Wow -- makes a difference.|
|CSSP||B.G.||0.5||About the same as glasses.|
|CSSP||K.G.||0.5||Better than my glasses.|
|CSSP||J.K.||0.5||Holly mackerel, very impressive.|
|TSP||A.M.||0.5||Clearer than without glasses.|
|CSSP||B.P.||0.50||Looks like it's sharper.|
|CSSP||C.S.||0.50||Amazing, like being at doctor's office.|
|RTMC||T.S.||0.50||WOW! Time to get the scope out, wonderful.|
|RTMC||A.B.||0.75||Wow-wee, looks like a champ.|
|TSP||G.M.||0.75||Must have accessory|
|TSP||K.M.||0.75||Don't wear glasses. Much better. Helps tremendously.|
|TSP||M.P.||0.75||Definitely sharper than no glasses. Equal to eyeglasses but more contrast|
|RTMC||J.S.||0.75||Small difference, but better than glasses.|
|CSSP||L.C.||1.00||Definitely better than glasses.|
|CSSP||B.E.||1.00||Wow - amazing.|
|RTMC||B.H.||1.00||Excellent, crystal clear.|
|RTMC||D.K.||1.00||Slightly better than glasses.|
|RTMC||P.L.||1.00||Wow, look at that. I'll be damned.|
|TSP||J.S.||1.00||About equal to eyeglasses.|
|CSSP||M.S.||1.00||Maybe better than glasses.|
|CSSP||J.L.||1.25||Definitely see a difference.|
|TSP||S.P.||1.25||Better than eyeglasses.|
|TSP||G.S.||1.25||Better than glasses.|
|TSP||E.B.||1.50/1.00||O' my word, marvelous.|
|CSSP||S.D.||1.50/2.50||Just as good as glasses.|
|RTMC||D.C.||1.50||Close or equal to eyeglasses.|
|RTMC||E.E.||1.50||Makes a difference.|
|TSP||P.F.||1.50||Not better than glasses.|
|CSSP||D.G.||1.50||Better than with glasses.|
|TSP||J.K.||1.50||Huge improvement, incredible.|
|TSP||G.M.||1.50||Good grief, phenomenal, vastly better than eyeglasses, marvelous.|
|RTMC||K.M.||1.50||O' my god, I'll be darned.|
|CSSP||P.P.||1.50||Better than glasses.|
|TSP||A.S.||1.50||Same or better than glasses.|
|TSP||D.G.||1.75||Very slightly better than glasses.|
|RTMC||L.K.||1.75||Difference is amazing.|
|RTMC||J.P.||1.75||Oh My Gosh.|
|RTMC||H.S.||1.75||A little better.|
|RTMC||D.L.||2.00||Amazing, sharper than my glasses.|
|CSSP||P.L.||2.00||O' my God, that's the best view I've ever had through my left eye. Good Lord, right on, Holy Hannah. That's the real deal, incredible, Wow, I'm amazed.|
|TSP||P.E.||2.25||Better with DIOPTRX™.|
|TSP||D.F.||2.50||A little sharper than eyeglasses.|
|TSP||F.H.||2.50||Much better than prescription.|
Dear Mr. Nagler,
I am writing to praise your DIOPTRX, which has changed my astronomical life. You may recall that I was the first one you assessed at RTMC and I replied, when I looked through the 2.5 diopter version, "Bloody Fantastic!"
I immediately ordered one and I used it this past weekend at 7,500 feet elevation, under beautiful dark skies in northern Arizona (I have a Panoptic 27mm, a Radian 18mm a Radian 12mm and an 8" SCT).
To me the great advantage is the ability to see the entire field of view through an eyepiece. That is simply marvelous. I spent hours this weekend viewing nebulae, star fields, etc., in a manner of enjoyment I have never had. As my wife said, given the odd occasion when she has glanced through my telescope with her glasses on (she does not wear them for viewing normally), she always pitied me and other glasses wearers who had to view with such restricted fields of view, even with the longer eye relief eyepieces.
By coincidence, I had my annual visit to my optometrist yesterday, and we discussed their use. I actually would need a 3.0 diopter for my right eye and 2.75 for my astigmatic left eye, but he suggested I stay with the 2.5, as higher diopters (via stacking) would introduce possible unnecessary aberrations, and the 2.5 works well for me. The net result is that I ordered a second 2.5 DIOPTRX for use with my bino viewer (I have a pair of Radian 18s), which now will get much more use.
A sincere thank you for bringing it to market.
— Jim Fitzpatrick
Dear Mr. Nagler,
The DIOPTRX 1.25 gave me excellent results with my 41 Panoptic, 31 Nagler, 26 Nagler and 18 Radian. I used the DIOPTRX in several different scopes I own (20 inch Starmaster f4.3, AP Traveler f6, and AP 178 f9.) I found improvements in star images and the appearance of Jupiter's moons in every scope/eyepiece combination producing an exit pupil greater than or equal to 3mm. I did not find that I needed more or less correction as the exit pupil became smaller or larger.
It is obvious that you truly care about the amateur astronomer and strive at every opportunity to enhance the experience of visual astronomy.
— Kim D. Colter, MD