Thank you! Just did a Prism Change on a Black OM1 I picked up at a charity sale. Scary, but your guiding video made it quite a comfortable experience. Best wishes from Yorkshire.

Thank you so much for sharing this useful Instructional video. I myself own an Olympus OM-1 I got sent to me from a very special close friend in NY city just a few years ago....Turns out this camera in particular is special to me because it was a gift I got from a mentor at my early eight years old of age (I wanted badly that camera from out of this world... The Olympus OM-1) but for many reasons I never made it to claim it back to me ... Now that I have it back in my hands, once again,, it turned out it has got lots of dust inside and outside because of time and now it's the right moment for a full clean-up to it... an adventure I wouldnt be willing to endeavour prior to watch your magnific video. Two thumbs up to you! Great Work and Great KZfaq channel! My compliments!

Excellent video. Having done this on my OM1, I understand the need for patience, steady hands and preferably an old white sheet (to easily locate any dropped springs or screws). I didn't know I could replace the prism from an alternate camera model.......good to know and I just might do it soon. Keep up the great work.

Thank you very much for the movie. Thanks to this instruction, I will replace the prism in my OM 1, it is a pity that in Poland, even the broken OM 40s are very expensive. Yours sincerely J.

I just got my wrench from the mail and I'm going to attempt this same repair on my OM-1n, but without changing the prism, since I don't have one on hand and it's still a very small patch. The foam is degraded and the viewfinder is very dusty and needs a cleanup. The nut on the wind lever and the shoe nut unscrew without any issue (which is good), but I need to prepare my workspace and sit for an hour to do the job. Edit: I managed to clean up the viewfinder and the prism and it's a night and day difference. The foam was easily removed with some alcohol and the viewfinder and prism cleaned up really well with lens cleaning solution. Around 45 minutes (the prism didn't line up the first time) for the job.

Excellent instruction video. Thanks for posting.

Great video, great job, thanks for sharing.

Thanks.

Great video. Until you said "rubbish bin under by bench here", I was convinced you were working on the floor 😅

Desintegrating foam is very sensitive to rubbing alcohool.

Really loved your video.

Great video. Can I replace the micro prism with split prism in the OM-1?

Awesome, and very very helpful, thank you so much.

The Pentax K1000 from the 90s have the same problem. I cleaned my pentaprism. There are still gray spots but I don't notice them and they don't show up on the pictures.

Tengo una OM2-SPOT PROGRAM y la palanca de arrastre de la película se ha bloqueado, no pudo moverla. Sabes como puedo hacer para que funcione? Gracias

Very instructive, but a couple questions; •The deteriorated rubber/foam around the prism doesn’t need to be replaced? •Can’t the prism be refurbished? Thanks again for the step-by-step!

While it doesn't have dedicated exposure compensation, the common technique was to reset the ASA/ISO value and expose as indicated. Or merely deliberately over/under expose. The camera was a tool and used as such. Dedicated Exposure Compensation was an additional complexity. Not resetting Compensation may have resulted in numerous disappointments: film frames and expense, irreversible lost opportunities. Still think adjusting exposure via deliberately changing Aperture/Shutter speed in terms of an awareness of the effect on so called "DOF" or motion blur risk/exploitation was a more purposeful choice. I still get caught out with "bracketing" when I forget that it "ON" or that totally separate compositionsl shots are exposured according to a preset sequence. Oh for those simple cameras like the MX (my own favourite was its predecessor the KX ). At that time, I was the one who took the shot. Now I spend my time working out how to set the camera to take the shot that I want. Taking wild flowers means that I now have to wait and plan for yet another year before trying again to get that elusive Australian Native Orchid. Cheers and Thankyou.

I have a question. Does the ISO adjustment ring go directly from 25 to 1600, or do you have to turn it all the way around? My OM-1 light meter has recently become erradic, responding weirdly to light, and I can see on your video that the ISO adjust sits straight on the galvanometer, so I'm worried it has broken when I've adjusted from 25 to 1600. I'm planning to open it up and see what the issue is, but it would be nice to know if it's normal for the ISO to turn 360 degrees.

I have an OM1 with just a little bit of degradation encroaching on the viewfinder and I've been wondering if it is worth disassembling to remove that rubber before it gets worse or if I am better off waiting until I can get a good prisim and replace it entirely. Watching this video I still don't know which way to go, but at least now I have a good guide and know it shouldn't be a terribly difficult project.

Thanks a lot for this very usefull. Had a couple of hour to spare and an organ donor just landed for my OM1 where everything ws fine except for the corrupted prism. Surgery went very well and in order to practice, I started with organ donor reassembly. Was a bit baffled about the latch spring as I didn't saw faling when removing the top plate On the camera I wanted to repair, I went throught the whole process without a problem but in the end the wind lever is not going to the full lengh and it looks like it's stuck. Any idea of what could have gone wrong ? Thanks !

Excellent video. Question: no need to replace the deteriorated foam you cleaned off?

Thanks for this video 👍

Nice job!

Thanks a lot! I have two OM-1s here which need their prisms replaced. Do the prisms of the 3-digit-OMs work as well (OM101, 707, etc)?

Got myself a OM-1 and tried it out with a fresh roll of film. Work fine for maybe 10 shots. But then when ever i wind for a new frame the shutter goes off directly. It's like the shutter button is stuck down but it's in the normal position. Do you have any idea what the problem could be? I guess it's been on a shelf and not used alot and needs a CLA.

Very helpful video! My only question is that I have seen people stress that you need a JIS screwdriver and that standard phillips head screwdirvers may thread the screws of the OM-1, would this warrent getting a new set of JIS compatible screwdrivers or would the regular phillips screwdriver work well without much damage. Thanks.

Is it necessary to replace the foam with something? If yes, what do you suggest? Thank you

As always, thanks so much for giving out this invaluable information! If it wasn't for this video I would have completely lost the first screw from the prism retainer. Do you happen to know any resources online for the dating based on the prism number you mentioned? Thanks again.

If the original prism is still good can you just clean off the foam and put it back in or will it move around in the top plate without the foam?

Will the prism on an OM-10 work?

Is the foam necessary? Do you need to put new foam in?

maybe a daft question....But are those "new: OM40 prism have a tapped hole on the front? On the OM40 it look like you unscrewed a screw that was holding some of the electronics cards/film.... RE the nasty foam. Watch many a youtube clip on this issue, but no one has ever mentioned that the foam can "slip" down the gap between the eyepiece and the prism. This what happen to me :-( . An "easy" job turn in to a smudgy eyepiece/prism nightmare with one tiny screw disappearing into that "lost things" abyss. How can you loose a BLACK screw on a off cream slightly beige carpet ? I can Oh BTW Thank you for your videos I find them really interesting and insightful thank you

Are those JIS screwdrivers?

👍👍👍👍😀

12:45 ya, I'm TOTALLY worried about an OM-2n I just got on ebay that had the hot shoe on it. It was so pretty in every other way, I figured it's fine. But I'll be really bummed out if there's an issue once I take it off.