RE: [APML] OT: M109, NGC 2403 and other collaboration images

["Gene Horr" <genehorr@houston.rr.com>]

-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On Behalf Of Greg Hartke
 
> Hi, Jason,

> It turns out that the diameter of an imaged point target target like a
> star increases with the focal ratio. 

One small nitpick.  This is only when comparing the same optical design.
Even aperture can play a roll as the outer portions may be too dim to
detect with a small aperture instrument but become detectable with
larger
apertures.

Gene Horr




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