Re: [APML] Supra 400 Reciprocity

[Alan Voetsch <alanv12952@yahoo.com>]

Hey Steve,

 I posted regarding this a couple years ago. I started an exposure of
NGC 7635 (Bubble), and then fell asleep. When I woke up, 5 1/2 hours
had gone by. Upon comparing that shot with the many others I had shot
of the Bubble that month, it was CLEAR that even at 330 minutes Supra
400 was still recording light. This time of yeay, I believe you could
expose a shot all night and still be good. Anyway, it would be
interesting to try. Go for it, keep notes and let the film show you
what it can do. BTW, I was shooting at f/10 with a 12" LX200.

Alan

--- Steve Lindsey <stevelindsey@earthlink.net> wrote:
> 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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