Re: [APML] Supra 400 Reciprocity

["Steve Lindsey" <stevelindsey@earthlink.net>]

Thanks all for the great responses to this question.  Guess I'll try a
reaaaaally long one sometime soon.  I'm asking a lot at f11 for film
(especially on these shorter nights!).  Just hungry for larger image scale,
flatter field, nice tight faint galaxy shots one gets without the reducer
and using neg film.  But I hate to use the typical one night a month I get
to a dark site all on one image of one object and use up a whole role of
Supra!  Too many things to go wrong on one shot!  Don't tempt me to go
CCD...!?!

I did see your scanning article Geoff and have been using your tips.
Thanks!

That's amazing about your Bubble story Alan!  Did you post the image?  I'd
like to see that one.

Steve


> I have been attempting some long focal length shots (f11 with my 10" SCT)
on
> Supra 400 (old formula) for some smaller faint galaxies to get tighter
stars
> than on slide film.  My goal has been to do 1 to 2 180 min shots on each
> object (preferrably 2 and stack).  The last couple of times out I keep
> getting cut off by wind, clouds or the mount running out of travel at
about
> 100 to 120 minutes.  For object like M101 or M106 or M65/66 I don't pick
up
> anywhere near enough detail to use for a decent image.  Is this just not
> long enough exposure at that FL or does Supra 400 just run out of gas past
> about 60 to 90 min and maybe is better suited of shorter FL scopes?  I
don't
> recall seeing really long exposures images on this film for comparison.
>
> Steve
>
>
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