robopro
Member
- Joined
- Nov 6, 2006
- Messages
- 67
- Format
- 35mm
I just started work on the plate holder for an 11X16 pinhole camera that will use glass plate negatives. Thought I'd build the holder first and then build the camera around it. Had this crazy idea about building a simple lens to make the camera interchangeable.
After a little research I've decided to use a 49mm Wratten #1 closeup lens placed 'backward' in the holding tube (convex side facing the inside of the camera). This has a focal length of 1000 mm, an extremely large image circle, and produces a fairly sharp image on a piece of cardboard, but there is some abherration around the edges and the subject needs to be at least 12 feet away.
Would adding a second lens help this any? If so, how far apart should they be placed, and should they face each other or both face the film plane?
I'm doing research on this now, as well as how to vary the focus in order to get closer to the subject, but any hints or suggestions from anyone who's already been there would be appreciated...
After a little research I've decided to use a 49mm Wratten #1 closeup lens placed 'backward' in the holding tube (convex side facing the inside of the camera). This has a focal length of 1000 mm, an extremely large image circle, and produces a fairly sharp image on a piece of cardboard, but there is some abherration around the edges and the subject needs to be at least 12 feet away.
Would adding a second lens help this any? If so, how far apart should they be placed, and should they face each other or both face the film plane?
I'm doing research on this now, as well as how to vary the focus in order to get closer to the subject, but any hints or suggestions from anyone who's already been there would be appreciated...