[pure-silver] Re: Fog


----- Original Message ----- From: "Shannon Stoney" <sstoney@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, September 28, 2005 9:58 AM
Subject: [pure-silver] Re: Fog


>----- Original Message ----- From: "Shannon Stoney" ><sstoney@xxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, September 27, 2005 6:12 PM
Subject: [pure-silver] Fog

I have been shooting with a renovated Rollei TLR from the thirties. Some of the exposures look fogged, but the fog does not appear to be coming from a leak in the camera. It is only in the area where the lens can expose the film. I wonder what is causing this? It is not consistent on a given roll of film; it is only on a few exposures usually. I wonder if it might have to do with the fact that the lens is probably uncoated?

--shannon


I don't think its the lens but check it by shining a flashlight through it while the shutter is on B (or T if its an olde enough camera). The lens should be crystal clear. If it shows any haze inside the haze will reduce contast a surprizing amount. However, it will affect all frames. Usually this haze is easy to clean off but, if its in the front cell, requires some disassembly.
Usually light leaks show up as streaks or bars in a part of the image. If you are getting this check the back to see if its warped. Also check along the inner edge of the upper part of the back, it has a black yarn light seal. Both the "old standard" and later Rolleis have this seal.
Also check for shiny areas in the camera box that could be reflecting light from the lens


There is a very shiny area in fact, screwed to the back. I think that might be the culprit. It is exactly the size of a frame of film and it is exactly opposite the lens. What were they thinking? Could this be a replacement part that was not painted black? I will paint it as you describe below.

Thanks,

--shannon

I think you mean the back plate. In old rolleis its shiny metal. Since the backing paper of the film is between this and any light its not the source of your problem. I think its more likely that there is a leak around the edges of the back or, perhaps, something more obscure like the shutter not closing all the way. Use a flashlight to look for leaks or reflections. Check that the anti-reflection paint inside the lens is not gone in some spot. This is not too likely but easy to look for. The intermittant nature of the fog means that light can get in only under some conditions but not others. If you can remember what circumstances the various pictures were taken under it may help. Since the fog stops at the film gate it suggests the leak is in the camera body. Quite mysterious.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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