Re: [APML] hypering and blank film

[Matt BenDaniel <matt@starmatt.com>]

Alan Jones wrote:
> > What exposure setting did you use?
> Wellllll without looking at the camera, I'll say I
> intended to use "B", however now you've got me
> concerned.  Geez will I feel stupid if I spent 4 hours
> taking exposures at 1/125!  I'd give up AP and start
> needlepoint.  I'll check tonight but if I did do
> something like that I'm not going to admit it! :)

Like Jason says, we've all made that mistake.  I listen VERY ATTENTIVELY
when I open and close the shutter.  When opening the shutter, if I have
the slightest doubt that it didn't sound quite right, I immediately
close the shutter (listening very carefully), verify the exposure
setting, and try it again.  I'd rather waste one frame of film (or two
or three) than an hour of precious dark sky time.  There is no feeling
worse than closing the shutter and not hearing the right sounds.  I'll
bet there are 100 people on this list who remember that feeling and
shudder to think of it (no pun intended).

Whenever I buy a new camera, I play with it, just opening and closing
the shutter for five minutes, listening to the sounds and becoming very
familiar with them.

I have an advantage with the Pentax 67.  The mirror is so huge that the
mirror slap registers 8.0 on the Richter scale.  For
lunar/solar/planetary, mirror lock-up is crucial.

> Is the answer to my question about hypering that
> there's nothing you can do in the hypering process to
> cause the film to not record any image at all, even in
> 45min?

Radically overhypered film might lose some sensitivity, but I'm sure you
would also see some ugly color changes somehwere on the film.
-- 
Matt BenDaniel
http://starmatt.com

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