[pure-silver] Re: Use of Shutters in low light?
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 6 Feb 2005 07:09:35 -0800
I won't disagree Richard,
But when I tried it, I realized immediately that you actually can take a
huge percentage of your landscapes and archy shots with no shutter at all.
At that point you can do large format for very very little money. Some of
these copy lenses and such are really very good and can be had for almost
nothing. This becomes more interesting for very large format work where the
glass in shutters gets very expensive. I once went so far as to draw up a
shutter made from matboard. It was to go on the front of the lens and would
basically consist of a card with a slit in it that I drop through a very
flat box attached to the front of the lens. With a little math the speed of
the shutter could be pretty accurately calculated, and cards with different
sized slots would give different effective shutter times. I bet that with a
full aperture slot, you could even rig a flash synch.But that's probably for
the "Mr. Wizard Large Format Camera Forum" :)
----- Original Message -----
From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, February 06, 2005 6:24 AM
Subject: [pure-silver] Re: Use of Shutters in low light?
>
>
> -----Original Message-----
> From: "J.R. Stewart" <jrstewart@xxxxxxxxxxxx>
> Sent: Feb 6, 2005 4:58 AM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Use of Shutters in low light?
>
> I've been wondering about something lately.
>
> I've been concentrating on large format for only about a year or so (4x5).
> Mostly landscapes using ASA 64 and 200 film). The big difference I'm
seeing
> is that LF/view cameras seem to require smaller lens aperatures (for depth
> of field) or slower shutter speeds. I don't know if there's a technical
> reason for this... it may just be my attitude after lugging my view camera
> to the chosen spot for the photograph and wanting to get a shot I'd have
> given up on with MF.... but nevertheless that's my situation.
>
> I've taken a number of shots that reflect a compromise I made at the time
I
> clicked the shutter at say f8 at 1/10th : poor depth of field. I suspect
> focus would have been much better at f22 at 1/2 second or f45 at 2 sec(+).
>
> So I'll ask: how often do folks really need a shutter for shooting LF? Do
> you find yourselves using T or B in the field and longer exposures? Even
> indoors using available light must force some of you to consider this "low
> light" situation a challenge. How do you handle it? Do many of you have
and
> use barrel lenses for field work?
>
> Thanks for the feedback.
> J.R. Stewart
> Leesburg, VA
>
>
>
> There are situations where just capping the lens is enough but for 4x5
a shutter of some sort is IMHO a necessity. For 8x10 you have to stop down
so much for depth of field that a very simple shutter is enough. I have some
barrel lenses mounted on boards with Packard shutters. Packard shutters are
simple air-operated shutters that mount either behind the lens on on its
front. The have one speed and B or T, the time varies with the size of the
shutter but is around 1/30th for the smallest of them. These used to be
plentiful and cheap used but the supply has dried up. They are still made,
the design being exactly the same as it has for more than a century.
> I also use barrel lenses on a Speed Graphic using the focal plane
shutter.
> For more about Packard shutters see: http://www.hubphoto.com at the
bottom click on Packard Shutter Company.
>
>
>
>
>
>
> --
> Richard Knoppow
> dickburk@xxxxxxxxxxxxx
> Los Angeles, CA, USA
>
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