Do all the single digit Olympus OM cameras have prism foam issues?

Having been bitten by the little camera bug, I've been cruising the OM camera auctions. A nice OM-1 was described as having debris in the viewfinder, which I assume could be the foam, as a lot of people seem to have that problem.

Do all the original OM cameras have potential issues w/ this, and is it a fix that a shade tree camera repair person could do? Or would it have to go to a real repair shop (assuming that it can be fixed or replaced)? Might need some tools either made or bought to get the top off.

The problem w/ buying one of these online is that if something is in the viewfinder, it could be the prism, or it could be that the viewfinder or mirror needs cleaning. Not every seller is going to know about this, so you may not know what's up until you actually have the camera in hand.

Is there any camera with foam seals or paddings where these do not deteriorate? Maybe at same models debris or corrosion do not show up in de finder or show up later.

In 2005, John Hermanson, a very knowledgeable servicer of Olympus gear, wrote this:

Someone else, in the same thread, contributed:

A few years ago, I sent in my OM-1n (owned since new, purchased in 1981) in for prism foam as preventative maintenance...I saw no evidence of foam or coating deterioration before I sent it in.

The only models subject to prism rot are the OM-1s and OM-2s. Here was a comment by John Hermanson: https://www.photrio.com/forum/threads/olympus-om-p-foam-problem.11264/#post-151212

I actually had John replace the prism in my 1970s OM-1, using a donor prism from a parts only OM-10 that I picked up for a song.

Ah, that really helps. Thanks! So I should watch out for it on the 1s/2s cameras.

The 50 1.4 and 1.8 lenses are selling as low as $40, and w/ no real price difference btwn them. That's very affordable for good glass. The 1.4 is supposed to have smoother bokeh, so I'll get one for the MV that's coming w/ a 50 1.8 on it and make a comparison.

This is what makes APUG, oops!, I swear that happened by itself!

This forum has people w/ actual experience, not a lot of opinions. I guess it's time to ante up and be a paying member because, really, where else is there a forum like this?

Old prisms can likely be reused if you scrape away the discolored and damaged part of the reflective coatings, then apply mirror paint to the now-clear areas. I don't recall whether my OM1n had foam in that area, but my original OM1 sure did, and what a mess it caused. As cameras go, it's pretty easy to pop the top off of these, but I recommend using a rubber cup rather than a spanner to remove the rewind lever cap.

wiltw said:

Above that number (and continuing to where the 1N chrome started) they were produced without prism foam.

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What became the the substitute for that foam padding?

Had OM-1 and have OM-1n - no foaming to report. Light metering issues though.

AgX said:

What became the the substitute for that foam padding?

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No idea...I paid to address the foam deterioration, they did not tell me exactly what they did.

AgX said:

What became the the substitute for that foam padding?

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According to John Hermanson, the prism foam was an Olympus solution to a problem that did not exist. He removes it, but does not replace it.

If you like, you can put a thin plastic shim under the clamp for the prism, but otherwise, no need to replace it.

I bought a couple of OM10s when they were dirt cheap, just for this donor concept...

I'd look into getting it serviced my zuiko.com. The last factory trained olympus OM repair man I'm aware of and he will overhaul your camera for a very reasonable cost. I'd look into getting a cheaper body, with more dings here and there, and use the money saved on a good overhaul. You'll end up with a much nicer camera than blowing it all on a Mint+++++ from one of the japanese sellers, for example.