argos33
16-Mar-2009, 13:19
Hi,
I have a rather large lens that I am trying to decide what the best approach for an iris and/or shutter would be. The two elements need to be 1.365 inches apart, and the inside lens elements are about 2.5 inches across. I am going to machine a barrel/spacer but am wondering what to do about the iris.
Another member with this lens machined a vertical waterhouse slot and would drop a slide with a hole in it (in front of the waterhouse stop) to get about 1/25th depending on the hole. I may end up doing this, but I would rather incorporate an adjustable iris and maybe throw a packard shutter in behind it.
Others apparently have used Sinar Auto or Copal DS shutters, but that is a pretty expensive option considering most of the exposures will be long. I have also heard of people using "Rapidyne" shutters but am not familiar with them.
Does anyone have or know where I can find a rather large iris that might work?
Evan
I have a rather large lens that I am trying to decide what the best approach for an iris and/or shutter would be. The two elements need to be 1.365 inches apart, and the inside lens elements are about 2.5 inches across. I am going to machine a barrel/spacer but am wondering what to do about the iris.
Another member with this lens machined a vertical waterhouse slot and would drop a slide with a hole in it (in front of the waterhouse stop) to get about 1/25th depending on the hole. I may end up doing this, but I would rather incorporate an adjustable iris and maybe throw a packard shutter in behind it.
Others apparently have used Sinar Auto or Copal DS shutters, but that is a pretty expensive option considering most of the exposures will be long. I have also heard of people using "Rapidyne" shutters but am not familiar with them.
Does anyone have or know where I can find a rather large iris that might work?
Evan