Nagler 31mm on a C11 for DSO ?

I would like to know if I buy the Nagler 31 mm for a C11 is the better choice for Deep Sky Objects

http://www.astromart.com/articles/article.asp?article_id=276
is about Nagler 31 in C14, but C11 shouldn't be too much different.

Dmitri

jean bruno said:

I would like to know if I buy the Nagler 31 mm for a C11 is the better choice for Deep Sky Objects

We need a few more details before we tell you how to spend your hard earned money , but here are my thoughts.

For a f/10 11" SCT, assuming performance is a priority versus cost...

Large DSO's like M42, Double Cluster, M31, large open clusters, etc., your best choice might be the 41mm Panoptic, giving you 1.0 degree tfov versus about .85 degree for the 31mm T5. You're limited to about 1.0 degree tfov (un-vignetted) anyway, but you might as well use it all.

Medium sized objects like the Swan, Lagoon and Trifid nebulae, larger galaxies and the larger globular clusters really shine in a 22mm or 17mm T4, or perhaps the 20mm T5.

Ed

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jean bruno said:

I would like to know if I buy the Nagler 31 mm for a C11 is the better choice for Deep Sky Objects

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Jean,

I use a variety of wide field ep's on my C14, and almost all of them seem to work great. The f11 light cone of the C14 is very forgiving, the f10 of the C11 should be very similar.

You might try some of the cheaper ep's first, they might surprise you. One of the Naglers chief advantages, is they handle the short F# ratios of the big dobs, that is not an issue here. But if money is not a consideration :S , you can't go wrong with the 31Nag.