Using shutterless barrel lenses
Posted: 07 May 2017, 07:59
Many moons ago I started my love affair with large format in 8x10 and larger, but found with my old brass barrel lenses such as derogy, jamin, darlot and the like, I was restricted to indoors. The xray film I use I normally rate at about 80 to 100 ISO, which is fine under artificial lighting and exposure times of a second or more. All of my old cameras are 10x12 or larger, so exposure times are sometimes multiples of 4 with bellows factor, depending on subject distances when doing studio portraits or table top, so a lens cap was adequate.
Crossing that line into landscape became a challenge, I used a Vageeswari 10x12 camera normally with a Ross 16 inch petzval lens. I couldn't rely on bellows factor to slow the exposure down to lens cap speed, as most shots were at infinity and there was no bellows factor.
My favourite studio camera was a Deardorff 11x14, so I had made all of my lens boards to fit the deardorff, any camera I had purchased after, I adapted the lens board holder to fit the big deardorff lens boards.
I bought an old graflex 4x5 with a working focal plane shutter, which of course has shutter speeds up to 1000th of a second. I cut the box in half saving just what I needed to keep the shutter mechanism intact, and adapted the shutter end to fit on the front of my cameras. I then adapted the front, minus bellows, to accept a deardorff lens board.
So now I can confidently take my wonderful lenses out into the sunshine and shoot 8x10 and larger at whatever speed is required.
There are alternatives without having to resort to Packard shutters.
Crossing that line into landscape became a challenge, I used a Vageeswari 10x12 camera normally with a Ross 16 inch petzval lens. I couldn't rely on bellows factor to slow the exposure down to lens cap speed, as most shots were at infinity and there was no bellows factor.
My favourite studio camera was a Deardorff 11x14, so I had made all of my lens boards to fit the deardorff, any camera I had purchased after, I adapted the lens board holder to fit the big deardorff lens boards.
I bought an old graflex 4x5 with a working focal plane shutter, which of course has shutter speeds up to 1000th of a second. I cut the box in half saving just what I needed to keep the shutter mechanism intact, and adapted the shutter end to fit on the front of my cameras. I then adapted the front, minus bellows, to accept a deardorff lens board.
So now I can confidently take my wonderful lenses out into the sunshine and shoot 8x10 and larger at whatever speed is required.
There are alternatives without having to resort to Packard shutters.