That may be the case with the NexGuide - it probably depends on the sensitivity of the guide chip and the accuracy of the guiding software. I have never had a problem finding a guide star using the Starlight Xpress Lodestar at 50 mm f/5 but it is a fairly sensitive camera. -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Monday, March 28, 2011 9:10 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Celestron NexGuide Of course you see "more stars" in a wider FOV, but there is a caveat. I don't think Celestron is talking about a statistical happenstance. More aperture lets you guide on fainter stars. I'll check on it as time permits, but IIRC, the NexGuide literature recommends 80mm to be able to allow 8th magnitude stars to be used for guiding. On 3/28/11, Don J. Colton <djcolton@piol.com> wrote:
Actually you have a more guide stars with the typical 50 mm f/5 because of the wider field of view. I have tried guiding with larger apertures and longer focal length and found this generally be the case.
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