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#1
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Faulty exposure -- light leak somewhere
"Cheesehead" wrote in message ... I'll add a link to a result later, but right now I think a description will suffice. I went out Sat. a.m. to do some early a.m. shooting. After I developed the negs, I saw some right-angle lines. The center of each of two negs was identically darker than the outside portion. *By "center" I mean roughly the middle 1/3, horizontally, and vertically from the top down about 2/3 of the height. . . . . x x x x . . . . . . . . x x x x . . . . . . . . x x x x . . . . . . . . . . . . . . . . . I used two different lenses, each on its own respective lens board (135 Xenotar and 210 Caltar) I've used the camera before and not had this problem. It is a Speed Graphic, circa 1950. The obvious question is to find the cultprit. My first though was the seal around the film holder Next thought is the back edge of the bellows. Any other ideas? In a darkened room, place a very small flashlight (turned on) in your camera on the tripod with the bellows extended, the lens closed, and the film holder inserted. |
#2
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Faulty exposure -- light leak somewhere
"Cheesehead" wrote in message ... On Oct 18, 12:01 pm, "Lawrence Akutagawa" wrote: "Cheesehead" wrote in message ... I'll add a link to a result later, but right now I think a description will suffice. I went out Sat. a.m. to do some early a.m. shooting. After I developed the negs, I saw some right-angle lines. The center of each of two negs was identically darker than the outside portion. *By "center" I mean roughly the middle 1/3, horizontally, and vertically from the top down about 2/3 of the height. . . . . x x x x . . . . . . . . x x x x . . . . . . . . x x x x . . . . . . . . . . . . . . . . . I used two different lenses, each on its own respective lens board (135 Xenotar and 210 Caltar) I've used the camera before and not had this problem. It is a Speed Graphic, circa 1950. The obvious question is to find the cultprit. My first though was the seal around the film holder Next thought is the back edge of the bellows. Any other ideas? In a darkened room, place a very small flashlight (turned on) in your camera on the tripod with the bellows extended, the lens closed, and the film holder inserted. Good idea. And easier as it gets darker earlier each day. :-) There are a couple of ways of looking for light leaks. First is the above, put a flashlight or lamp that won't get too hot in the camera and examine the bellows with them extended fully. However what you describe does not sound like fogging from pin holes. Also, all Speed Graphics made since about 1938 have synthetic bellows that seem to last forever and not develop leaks. To check the holder and back of the camera remove the lens board place a holder with white paper in place of the film in the camera and remove shine a strong light around the periphery of the holder and camera back. Do this with the dark slide in place and removed. There should be no light leak visible when looking into the camera through the front. Light leaks can be very hard to find. Are you sure the darker areas are due to being light struck and not to uneven development? -- -- Richard Knoppow Los Angeles, CA, USA |
#3
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Faulty exposure -- light leak somewhere
On 10/24/2010 4:22 AM Cheesehead spake thus:
It looks like next week I will have time to check it out via various methods. The negs were developed in a jobo tank that was rotated on it wheel base. The lines on the two negs are in the same place. If it were processing, if the tank were not rotated, then the lines would be offset based on the relative neg position in the liquid. You say there are "lines" on the negative, but it's not clear exactly what exactly these are. Are they sharp, distinct lines? Fuzzy but visible lines? If lines, are they lighter (less dense) or darker (more dense)? Or are they *areas* of different density with a more or less distinct edge? More description here might help us to diagnose the problem. Or you could scan the negs and post the results somewhere online. -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com) |
#4
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Faulty exposure -- light leak somewhere
"Cheesehead" wrote in message ... On Oct 18, 12:01 pm, "Lawrence Akutagawa" wrote: "Cheesehead" wrote in message ... I'll add a link to a result later, but right now I think a description will suffice. I went out Sat. a.m. to do some early a.m. shooting. After I developed the negs, I saw some right-angle lines. The center of each of two negs was identically darker than the outside portion. *By "center" I mean roughly the middle 1/3, horizontally, and vertically from the top down about 2/3 of the height. . . . . x x x x . . . . . . . . x x x x . . . . . . . . x x x x . . . . . . . . . . . . . . . . . I used two different lenses, each on its own respective lens board (135 Xenotar and 210 Caltar) I've used the camera before and not had this problem. It is a Speed Graphic, circa 1950. The obvious question is to find the cultprit. My first though was the seal around the film holder Next thought is the back edge of the bellows. Any other ideas? In a darkened room, place a very small flashlight (turned on) in your camera on the tripod with the bellows extended, the lens closed, and the film holder inserted. Good idea. And easier as it gets darker earlier each day. :-) ****** Soooo...any findings yet? |
#5
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Faulty exposure -- light leak somewhere
"Lawrence Akutagawa" wrote in message ... "Cheesehead" wrote in message ... I'll add a link to a result later, but right now I think a description will suffice. I went out Sat. a.m. to do some early a.m. shooting. After I developed the negs, I saw some right-angle lines. The center of each of two negs was identically darker than the outside portion. *By "center" I mean roughly the middle 1/3, horizontally, and vertically from the top down about 2/3 of the height. . . . . x x x x . . . . . . . . x x x x . . . . . . . . x x x x . . . . . . . . . . . . . . . . . I used two different lenses, each on its own respective lens board (135 Xenotar and 210 Caltar) I've used the camera before and not had this problem. It is a Speed Graphic, circa 1950. The obvious question is to find the cultprit. My first though was the seal around the film holder Next thought is the back edge of the bellows. Any other ideas? In a darkened room, place a very small flashlight (turned on) in your camera on the tripod with the bellows extended, the lens closed, and the film holder inserted. Soooo...any findings yet? |
#6
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Faulty exposure -- light leak somewhere
"Cheesehead" wrote in message ... On Nov 14, 11:09 am, "Lawrence Akutagawa" wrote: "Lawrence Akutagawa" wrote in message ... "Cheesehead" wrote in message ... I'll add a link to a result later, but right now I think a description will suffice. I went out Sat. a.m. to do some early a.m. shooting. After I developed the negs, I saw some right-angle lines. The center of each of two negs was identically darker than the outside portion. *By "center" I mean roughly the middle 1/3, horizontally, and vertically from the top down about 2/3 of the height. . . . . x x x x . . . . . . . . x x x x . . . . . . . . x x x x . . . . . . . . . . . . . . . . . I used two different lenses, each on its own respective lens board (135 Xenotar and 210 Caltar) I've used the camera before and not had this problem. It is a Speed Graphic, circa 1950. The obvious question is to find the cultprit. My first though was the seal around the film holder Next thought is the back edge of the bellows. Any other ideas? In a darkened room, place a very small flashlight (turned on) in your camera on the tripod with the bellows extended, the lens closed, and the film holder inserted. Soooo...any findings yet? Yes. It appears that in all likelihood it was my processing. It seems that I apparently did not fill the tank full and set it still for some seconds at a time. This seems to be the case because the lines on the images are staggered a bit, somewhat like their position in my Jobo tank. ****** Glad to hear that you seem to have found the source of your problem. |
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