Identifying eyepiece aberrations
Posted 28 November 2013 - 03:29 AM
Thanks in advance
Posted 28 November 2013 - 08:43 AM
Also have some Naglers (bought used too) and they are sharp & work very well, depending on the scopes being used.
L-R: Naglers 9mm (T1), 12mm (T2), 5mm (T6)
The Nagler 5mm does not provide sharp-focus with my 8" SCT/f10 because it yields too much power (400x); it's more suitable for other scopes in the stall like the refractors (2.5", 3", 4", 6").
What focal length is your Nagler? Have you used it on any other scopes (like refractors)? Thanks.
Posted 28 November 2013 - 01:09 PM
Posted 20 December 2013 - 02:19 PM
Posted 02 January 2016 - 03:42 PM
May have missed it, but I didn't see reference to the article below. Thought this would be a good place to put it.
A lot of controversial claims in that article. It's interesting to read, but he casually ignores a lot of aberrations in his "favorite" eyepieces, and he makes a number of claims that are unsupported in lab tests, such as increased light scatter from multi-coatings.
Take the article with a grain of salt, even though there is much interesting in the article.
Posted 23 January 2016 - 12:20 PM
Maybe include EOFB (Edge of Field Brightening) as an eyepiece aberration?
Posted 23 January 2016 - 12:31 PM
Yes, maybe as a subset of #13 Light Scatter.
It obviously is a light scatter phenomenon, but what it's from is still conjecture.
- Sarkikos likes this