Quote:
Originally Posted by casstony
The new Nagler arrived yesterday and it looks like being cloudy for a few days so I can only play with it in the daytime. It seems to work well with the barlow but I'm curious to hear from someone who's used this combo under the stars. Is there any negative impact on the image from using the 31 Nagler with the 1.6x barlow?
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Hi Tony,
I have both of those items and they work very well together in my F4.5 newtonians. That having been said I only use that combo to "play around and test". While it has a larger TFOV, optically it is just short of the 20mm Pentax XW in a paracorr in those scopes, in terms of contrast and throughput. Slightly better at EOF, a little behind on axis. It comes down to personal preference and what performance criteria are most importnat to you.
If you don't already own an 18mm to 22mm eyepiece, the 31mm Nagler in the 1.6X Antares is an excellent option and saves the need to buy another eyepiece. Any gain from a standalone 20mm eyepiece isnt huge. And it does give very good eye relief at this focal length.
Cheers,
John B