When I had the chance to use the new Dioptrix attachment in the building at the expo at TSP I was wildly enthusiastic about it. The cloudy weather did not afford the chance to use it at night at TSP. I just received my Dioptrix and have tried it on my 31 Nagler. I am using the Dioptrix with the same level of correction as my glasses prescription has. My results under the night sky are less pleasing than my results looking at an eye chart through a telescope during the daytime. I suspect that the difference has to do with my pupil size being different in the two circumstances. I rather suspect that I have more astigmatism when my pupil is dilated to 6 to 7 mm at night than I do during the day when my pupil is dilated to 3 mm.
It would be lovely if there were a way to try the various diopter levels of correction on one's eyepiece at night in order to pick the one that affords the best correction. I would be interested in hearing whether other people with significant astigmatism have had similar experiences with the Dioptrix.
On a parallel track, I have found that some people who have had corneal refractive surgery and are delighted with the results during the day are disappointed with what they see and don't see at night. I think most of the corneal refractive surgery done corrects the central 3mm of the optical axis but does not correct the outer "ring" of a fully dilated pupil. "Turned down edge" on one's own cornea messes up an image even more than TDE on a mirror or refractor objective, it would seem.
It would be lovely if there were a way to try the various diopter levels of correction on one's eyepiece at night in order to pick the one that affords the best correction. I would be interested in hearing whether other people with significant astigmatism have had similar experiences with the Dioptrix.
On a parallel track, I have found that some people who have had corneal refractive surgery and are delighted with the results during the day are disappointed with what they see and don't see at night. I think most of the corneal refractive surgery done corrects the central 3mm of the optical axis but does not correct the outer "ring" of a fully dilated pupil. "Turned down edge" on one's own cornea messes up an image even more than TDE on a mirror or refractor objective, it would seem.
