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Re: [OM] Lens flaw

Subject: Re: [OM] Lens flaw
From: "R. Jackson" <jackson.robert.r@xxxxxxxxx>
Date: Mon, 2 Dec 2002 18:27:14 -0800

On Monday, December 2, 2002, at 06:04  PM, dreammoose wrote:

So you haven't tried it yet since removing the hair from the back of the lens?

Nope. I'm going to use it Wednesday a little, though.

Do you have any other Oly bodies to see if it shows up on a different body?

Yeah, I just recently bought a 4T, which is what I'm planning to use Wednesday.

It could still be something in the mirror box that isn't in the light path from the longer lenses but sticks into the path of the wide angle. Contary to what others have suggested, it doesn't have to be actually touching the film, just nearby.

Last night after that discussion I looked around inside my OM-1n and didn't really see anything that could have been a problem. I need to shoot some more film through it, though, and see what happens. I'm just hung up on the new camera right now and can't find much time for the old girl. ;-)

The example you provided is shot in bright light. I can't tell where the lens is focused, but closer stuff seems maybe sharper than distant stuff. A 28mm lens stopped way down has a lot of depth of field. If it is focused in mid or close range, something on a lens hood or even sticking out from the filter threads, etc. could possibly give an almost in focus image on the film. When you look through the viewfinder, the lens is wide open, with less DOF, so you wouldn't easily notice something like that through the viewfinder. Remember that in a retrofocus WA design, the front of the front element can be quite a distance in front of the optical nodes.

This is an excellent point. It was a very bright day when I took that photo and I had it stopped all the way down with my focus point shorter than infinity by about a half-inch. I was hoping all the DOF would make it seem like most everything was in focus. Perhaps including the offending object. The day was brutally windy and I changed lenses in the open a couple of times, so the potential for just about anything to be just about anywhere was there.

I'm no repair expert, but pretty knowledgeable about camera/lens stuff and have done minor repairs on both. If you want to try another set of eyes, I may be nearby, as I live in Berkeley. Reply off list if I can help.

I'm in Santa Rosa. If the images this week come back contaminated I may take you up on that. I appreciate the thoughtful response.

-Rob


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