nelsonfotodotcom
7-Dec-2007, 15:36
Many months ago, Sandeha Lynch, of Wales, sent me a 4x5 P&S kit he made himself. I finally got around to completing it as a pinhole, a couple of months back. To make it right-as-rain, I needed a lens in shutter for it. A 90mm would do the job.
Purchased a 90mm Optar from a guy here on LFf. It arrived yesterday, and this morning I awoke and set about getting it mounted in a board.
I have a spare ground glass, so I opened up the lens, raised my blinds, held the glass in the back of the camera, and eyeballed. Looked good, but not good enough. I tilted the glass at the bottom, prying up and away to increase focal length--basically tilting--and noted the image sharpness shifted on to a point about lensboard's thickness. That's where it needed to be.
Began to brainstorm, and realized I could just strip the other board of its pinhole, and use that board as a shim. Perfect!
Taped the boards into place, bagged the camera, went to Colliers to dig out an old grip--found a nice one, big and thick, with a cold shoe, and through-the-grip cable release mount. Picked it up, and headed to the graveyard.
Once there, I mounted the camera on the tripod, and walked it back and forth until I found infinity distance. Once accomplished, I fired off four sheets of Acros rated 160, fstops from f6.8 to f32, skipping f16. Came home, souped up in Diafine, and they're hanging to dry now.
Being the impatient little PITA that I am, I shot two of the sheets with my D70s and Tamron, using the piss-poor lamp in my frontroom that doubles as a place to hang my film.
Oh. What. Fun.
Should have the negs scanned soon. For now...
http://farm3.static.flickr.com/2250/2094292712_e55b41ef7d.jpg (http://farm3.static.flickr.com/2250/2094292712_9a7c0c534e_o.jpg)
http://farm3.static.flickr.com/2217/2094292904_0fa85f8e4c.jpg (http://farm3.static.flickr.com/2217/2094292904_528e6c177d_o.jpg)
http://farm3.static.flickr.com/2409/2094293126_86351f9352.jpg (http://farm3.static.flickr.com/2409/2094293126_657786c773_o.jpg)
Purchased a 90mm Optar from a guy here on LFf. It arrived yesterday, and this morning I awoke and set about getting it mounted in a board.
I have a spare ground glass, so I opened up the lens, raised my blinds, held the glass in the back of the camera, and eyeballed. Looked good, but not good enough. I tilted the glass at the bottom, prying up and away to increase focal length--basically tilting--and noted the image sharpness shifted on to a point about lensboard's thickness. That's where it needed to be.
Began to brainstorm, and realized I could just strip the other board of its pinhole, and use that board as a shim. Perfect!
Taped the boards into place, bagged the camera, went to Colliers to dig out an old grip--found a nice one, big and thick, with a cold shoe, and through-the-grip cable release mount. Picked it up, and headed to the graveyard.
Once there, I mounted the camera on the tripod, and walked it back and forth until I found infinity distance. Once accomplished, I fired off four sheets of Acros rated 160, fstops from f6.8 to f32, skipping f16. Came home, souped up in Diafine, and they're hanging to dry now.
Being the impatient little PITA that I am, I shot two of the sheets with my D70s and Tamron, using the piss-poor lamp in my frontroom that doubles as a place to hang my film.
Oh. What. Fun.
Should have the negs scanned soon. For now...
http://farm3.static.flickr.com/2250/2094292712_e55b41ef7d.jpg (http://farm3.static.flickr.com/2250/2094292712_9a7c0c534e_o.jpg)
http://farm3.static.flickr.com/2217/2094292904_0fa85f8e4c.jpg (http://farm3.static.flickr.com/2217/2094292904_528e6c177d_o.jpg)
http://farm3.static.flickr.com/2409/2094293126_86351f9352.jpg (http://farm3.static.flickr.com/2409/2094293126_657786c773_o.jpg)