Re: [APML] Exposure Question

["Brian Larmay" <astrobri@ameritech.net>]

Bill, that is an incredible shot of cygnus!
Ok... I never really read about large format but have an idea thereof..
So what Im seeing in this photo is one frame at 105mm?
Is this what the lens sees and records for that FOV?

I have to get me one of those if thats the case!


> Brian Larmay wrote:
>
> > Skyfog does not let me go any longer then this.
> >
> > I do not comprehend how others can or need to go longer then this unless
> > they stop down incredibly.
>
> Brian,
>
> >From a "good" location.
>
> http://www.celestial-images.com/Cygnus67.html
>
> Pentax 6x7 105mm lens at f/4. I regularly shoot 60 minutes, even at
> f/2.8. But ..... as you said so eloquently. "Sky-Fog" Not really a
> problem if its dark. Though I do tend to shorten the exposure a bit when
> doing Sagittarius. It just seems to be "hot" And the prime focus stuff
> is also usually 1 hour at f/4 as well. Thats on E200.

This is interesting...

I was shooting the Scutum Starcloud last year with hypered Tech pan and
Lumicons H-a filter for 35 mins and @ f/4, it was too long by 15 mins on my
105mm.
I had to hold the neg up to the sun to actually see that the starcloud was
really there ... and all this was developed for 7 mins using D-19.
7 seems to be the magic # here.

Brian

> Regards
>
> Bill
>
> -- 
> William R. Mattil |
> wrmattil@ix.netcom.com | http://celestial-images.com
> (972) 399-4106 |
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