RE: [APML] E210 Coma

[Kirk Carbo <kcarbo@lobosservices.com>]

The stars are like little rounded v's or arrow heads or delta wings,
pointing away from the center.  They start out as a slight elongation, but
at around 30 to 35mm I can begin to distinguish the v shape.  There is a
notch cut in the back of the v shape, so it looks like a small letter v with
the sides and point rounded a little.  

> -----Original Message-----
> From: Gene Horr [mailto:genehorr@houston.rr.com]
> Sent: Thursday, May 08, 2003 12:32 PM
> To: Discussion of Film Astrophotography
> Subject: RE: [APML] E210 Coma
> 
> 
> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of Kirk Carbo
> Sent: Thursday, May 08, 2003 10:51 AM
> To: APML (E-mail)
> Subject: [APML] E210 Coma
> 
> >  My understanding is focus doesn't cause coma anyway.
> 
> Well, actually I've seen distortion when collimation
> is not perfect when you are out of focus.  And the effects 
> start at the edge and work inwards the more you are out of
> focus.  It may be field curvature rather than coma but
> the results are oblong stars.
> 
> Are you getting an actual comatic "flare" or is it just
> oblong?
> 
> Gene Horr
> genehorr@texas.net
> 
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