|
Well, I did get a chance to use them here at home in my 4" f/7 triplet apo refractor (714mm focal length).
Some notes:
The only aberrations noted were some astigmatism at the edge (and it was just a *trace* better than in the coma-corrected dob), and the same exit pupil issues I noted in the dob.
All other characteristics were not noted in the somewhat brighter skies of my home. Edge reflections, field stop focus, lateral chromatic issues all went without notice.
I intend to use these again in the refractor at a dark site so I can evaluate the other issues I saw in the newtonian.
I don't have an f/10 or longer scope to test these in, but they likely would perform better in regards to edge of field astigmatism in the longer f/ratios.
These likely would be excellent in long f/ratio refractors and Maks.
I am concerned with the exit pupil issues, though. There are some issues with acquiring and holding the field when using these.
To put that in perspective, it is nowhere near the problem of using the original Naglers, which had kidney bean blackouts dues to spherical aberration of the exit pupil. I think you would only notice it in the Vixens if switching to another eyepiece that had no such issue.
Given the refractor has close to 1/3 the focal length of the newtonian, I was surprised to not notice any notable field curvature.
I'll post more when I get a chance to use them at my dark site, which is at least 4 magnitudes darker than my home.
|