A Funky Set of Celestron 2" Filters
I recently obtained a set of Chinese-made 2" Celestron filters in a 2" Eyepiece kit, and they are -- to say the least -- rather odd.
First of all, the filter threads do not seem to be quite the right size / pitch for most 2" oculars, and they do not thread in more
than a turn or two. How does this happen?
Next, their colors do not seem to match their description in the case of the green and blue filters. The green filter is labeled as
a #58, but it is much closer to a lighter #56 filter. The #80A approximates a standard #38A, so I am wondering if someone just
put the wrong filter in a #80A cell in this case. The red, orange, and yellow filters seem "closer" to their standard counterparts,
using, in most cases, Tiffen (Wratten-based) filters for comparison.
Finally, these filters do not seem to be coated, and I have yet to do a full aperture star test on any of them. The Japanese-made
Celestron filters that I have tested in the past seem to be uniformly good, so it will be interesting to see how good -- or not --
these are. Granted, these are not "expensive" filters, but should Celestron really be marketing something like this? Likewise,
if you were to purchase an individual 2" filter from Celestron, would they be of the same quality as these?
Has anyone else had similar experiences with these 2" filters?
Edited by Uncle Milt, 20 September 2019 - 08:38 PM.