A new article by Bill Kumpf on a DIY guillotine shutter has been posted. It is composed of two parts:
Constructing a simple shutter
and
Determining shutter speeds
Comments are welcome in this thread.
A new article by Bill Kumpf on a DIY guillotine shutter has been posted. It is composed of two parts:
Constructing a simple shutter
and
Determining shutter speeds
Comments are welcome in this thread.
Here we go once again...
Not commenting on the unusually thick guillotine blade and the choice of its material one thing should be said - this kind of shutter condemns your camera to horizontal positions mostly. As soon as you tilt it you start to get different results. Sometimes less, sometimes more, sometime off in an unacceptable way, etc.
Even given the limitations, I think an availability of these would help many people make the leap to trying barrel lenses. The guillotine shutter is easy to understand and this one attaches with rubber bands. Mounting packards on lens boards can be intimidating and a hassle and expensive if you have to buy the packard shutter.
If I had any woodworking skills at all, I'd make some of these and loan them out to people. I suspect many people out there would love to be trying old brass barrel lenses, etc, and just don't know where or how to start with it.
Richard, you don't need any woodworking skills at all. You can make the thing out of PVC sheets with many advantages over wood (better slipping, no dimensional changes when wet, easier manufacturing etc.)
But to loan them you would need a lot of different diameters to satisfy your customers' different lenses...
And if you wanted to make a De luxe version you could put a small drop of oil between the blades to make it slip with less friction even in more inclined positions. Olive oil (extra virgin) would do...;-)
It seems the idea of a simple shutter got lost along the way, though I did appreciate the ingenuity.
As for the matter of being committed to horizontal exposures as mentioned on page 1, simply calibrate for a vertical exposure, and when you rotate the back subtract 1/4 for a 4:5 proportion, or 1/3 for a 2:3. If you have to rotate the camera, same calculations, just mount the shutter to allow rotating it 90 degrees.
sliding lackier!!!
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