Generally, the higher the number for the axis and cylinder on your prescription, the stronger your astigmatism is. The picture below depicts how viewers with severe astigmatism would see. What is a bad astigmatism number? 75 and 2 diopters is considered mild astigmatism. Between 2 and 4 ...
finding a place to put my glasses when looking thru the scope with out glases is a pain, and i'lI definitley need the perscription to just look up at the stars and see any detail. thanks for touching on the performance needs at an observation site. I will probably stick with a progre...
I have one. Respectable on axis views, and $250 eyepieces clean up the off axis portions pretty well. Mine has always held collimation well. Stays in my shed these days as the 4" Apo is clearly superior. I keep it around as it could be a good beater scope for the kids when they ...
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The astigmatism axis indicates the angle of the plane with the lower power. In the example of the planes at 90 and 180°, if the 180° plane has a lower power, then the astigmatism axis is 180. Conversely, if the 90° plane has a lower power, the axis is 90. In this way, a si...
I have an astigmatism in my left eye, and I have a very slight color change in either eye, its unnoticeable unless I really concentrate on the color of something and cover each eye individually, etc. My point is, I think astigmatisms can affect the eyes in many ways, not just blurry ...
The value of a coma corrector depends on the eyepieces one is using. Eyepieces like the T-6 Naglers that free from off-axis astigmatism benefit from using a top notch coma corrector at higher magnifications. The Paracorr 2 + Nagler/Ethos etc is essentially perfect edge to edge. I'm not...
Page 1 of 3 - Whats the point of a Schmidt-Newtonian? - posted in Cats & Casses: Im not trying to start a flamewar; Im trying to get it.So a Newtonian exhibits coma (and astigmatism?) off-axis. Fine. So you add a Schmidt corrector, and it *still* exhibit
Page 1 of 2 - Whats a Chromacorr?? - posted in Refractors : Hi, I just read that theres this thing called a Chromacorr. Can anyone tell me what it is? I searched Yahoo but didnt find alot. It seems to do what an MV filter does but costs as much as some A
This was just a quick glance night: Jupiter - a nice disk & moons but some flaring - wished I had a filter - better near the edge of the fov - user astigmatism?, Saturn just a squished small blob, M31, Cassiopeia, Perseus (lots of stars visible in the binos of course), the P...