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TeleVue Nagler Type 4 22mm

Regarding the 22mm Nagler T4, this eyepiece is something of a disappointment, at least when used in my faster scopes. Having first purchased a 12mm T4, I expected the same qualities from this one. Instead, stars were quite comatic around the outer 1/3 of the FOV. Being quite expensive, I found this unacceptable for an eyepiece line claimed to be corrected down to f/4. This one is not.

However, all is well when used with a Paracorr which corrects the view to almost perfect. Also, the 22mm works well with the 4x Powermate. If you have a fast scope (not sure at what f/ratio the problems begin to arise) and want to use the 22mm T4, you need a coma corrector. At more than $730 for the 22mm and a Paracorr with the tuneable top, this is an expensive combination. Still, the views ARE excellent once you have what you need. The 17mm does not seem to have these problems to the same extent, but I use it with the Paracorr anyway, now that I have one.

Conclusions: Too expensive, not well-corrected at faster f/ratios, requires a Paracorr, Powermates well, stunning widefield views once everything is in place. I'd give it a "6" or "7" if it weren't for the final views attainable. A reluctant "8".

Overall Rating: 8
Weight: 7 (Veritable Vote)
Date: 10/21/2000 03:52:16 am PST
By: Anonymous (xxx.xxx.214.54)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=43545

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