Sounds like I now have a 5mm nagler for sale Bob Moore Commerce CRG - Salt Lake City office 175 East 400 South, Suite 700 Salt Lake City, Utah 84111 Direct: 801-303-5418 Main: 801-322-2000 Fax: 801-322-2040 BMoore@commercecrg.com www.commercecrg.com -----Original Message----- From: utah-astronomy-bounces+bmoore=commercecrg.com@mailman.xmission.com [mailto:utah-astronomy-bounces+bmoore=commercecrg.com@mailman.xmission.c om] On Behalf Of Chuck Hards Sent: Friday, April 27, 2007 11:32 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Observing notes - Ealing 4-26-2007 Lunar visual Based on my experience, Don is 100% correct- every Nagler I've used has been "soft" near the center of the field. Even my mid-priced orthos do better than Naglers as far as definition goes. This isn't noticed at low powers; at high powers typically used for plantary observation and close double-stars, wide-field isn't needed. The Ealing can sometimes have troublesome tube currents for the first few hours of observation. It takes that big primary a while to cool down. But this is usually easily identified as separate from diffraction limitations. On 4/27/07, Don J. Colton <djcolton@piol.com> wrote:
Unfortunately the Naglers do not do that well at high power because of the number of elements. I have found that good plossls, the Takahashi and the monocentric are the best performers.
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