davidsimon Posted January 9, 2018 Share Posted January 9, 2018 I just bought a rather splendid OM-1n off the 'bay and it came with this rather nifty replacement battery compartment pre-installed, which is perfectly sized for a pair of SR44W's, and also swaps the battery terminal to the opposite side for easy installation of the required voltage dropping diode. Does anyone recognise this new compartment and advise where I can get more of them? Perhaps it's been cannibalized from a different camera, I'm not sure. Its the neatest upgrade I've seen so far on one of these lovely cameras. Link to comment Share on other sites More sharing options...
BeBu Lamar Posted January 10, 2018 Share Posted January 10, 2018 It looks like from the OM-2. The OM-2 uses 2 LR-44 batteries and I guess Olympus didn't want to redesign the battery compartment completely. Link to comment Share on other sites More sharing options...
John Seaman Posted January 10, 2018 Share Posted January 10, 2018 An unmodified OM1 was designed for a single 1.35V mercury battery. The modification appears to call for two 1.5V batteries. Just saying. Link to comment Share on other sites More sharing options...
tomspielman Posted January 10, 2018 Share Posted January 10, 2018 (edited) I have a couple of OM-1n(s) at home and an OM-2n. Offhand it does look very much like an OM-2n battery holder and it definitely takes two batteries as opposed to one. Maybe the intent was to shove a piece of foil (or something) in there along with a single battery? On the other hand that's a more substantial diode than I'm used to seeing for this type of modification but I can't see it dropping the voltage 1.5+ volts. Edited January 10, 2018 by tomspielman Link to comment Share on other sites More sharing options...
tomspielman Posted January 11, 2018 Share Posted January 11, 2018 After pulling the bottom plate on my OM-2 I'd say what you have there is actually an OM-2 rather than an OM-1. Is there a small circuit board with an IC on it at the opposite end from the battery holder? If so, it's not an OM-1 you've got. Did somebody switch the top plate? Link to comment Share on other sites More sharing options...
Gus Lazzari Posted January 12, 2018 Share Posted January 12, 2018 Here are the true baseplate differences between an OM2 & OM1n.. Bottom is the OM2 Link to comment Share on other sites More sharing options...
mwmcbroom Posted January 12, 2018 Share Posted January 12, 2018 I can see only two differences between the OM-1 and OM-2 in the above photo. The battery compartment, and the presence of the purple wire in the OM-1n and the black wire plus diode in the OM-2. Please note that in the top photo, showing the OM-1n with the OM-2 style battery compartment that it still has the purple wire, plus the addition of the black wire and diode. And that diode looks to be the same as the one used in the OM-2. The biggest question I would have is, is the OM-1n giving the correct exposure values when batteries are installed? If so, then that diode is doing its job. If not, then perhaps a 675 hearing aid battery and a wad of foil is called for (although the diode may drop its voltage). A 675 should fit that compartment just fine. The 675 hearing aid battery delivers 1.4v compared to the original mercury's 1.35v. Close enough, I've found. True, 675 hearing aid batteries don't last very long -- maybe two or three months -- but they're so plentiful and cheap that it is almost worth it to install a new one at the beginning of a new shoot. I buy my 675s at Costco. A card of 48 for less than $10. Having said all that though, first give it a try with a couple of 1.5v batteries and see how it performs. Link to comment Share on other sites More sharing options...
tomspielman Posted January 12, 2018 Share Posted January 12, 2018 Still think it's a case of mistaken identity. Below is a picture of the bottom of an OM-1n (left) next to an OM-2n right). I'm surprised the 2n has a circuit board and a 2 does not, but anyway you can see that the 2n battery compartment area looks exactly the same as the OP's, purple wire, diode and all. What the OP appears to have is not a modified 1n but a stock 2n. Link to comment Share on other sites More sharing options...
mwmcbroom Posted January 14, 2018 Share Posted January 14, 2018 Hang on a minute -- if the OP's OM-1n is actually an OM-2n, as you claim, then what happened to the integrated circuit and all its accompanying wiring in his camera, as is shown in the OM-2n in your photo? Also, there are a few levers shared by both OM-1s that are not shared by both OM-2s (but the OM-2s share their own levers). Check out the lever arrangement to the left of the tripod mounts in the top photo and north of the tripod mounts in the bottom photo. No, that camera in the very top photo is definitely an OM-1, whether an "N" or not, I can't say. But it's not an OM-2. Link to comment Share on other sites More sharing options...
tomspielman Posted January 15, 2018 Share Posted January 15, 2018 Hang on a minute -- if the OP's OM-1n is actually an OM-2n, as you claim, then what happened to the integrated circuit and all its accompanying wiring in his camera, as is shown in the OM-2n in your photo? Also, there are a few levers shared by both OM-1s that are not shared by both OM-2s (but the OM-2s share their own levers). Check out the lever arrangement to the left of the tripod mounts in the top photo and north of the tripod mounts in the bottom photo. No, that camera in the very top photo is definitely an OM-1, whether an "N" or not, I can't say. But it's not an OM-2. It probably would have been better if I had oriented my cameras with the battery compartments up as in the first photo. You don't see the circuit board in the OP's photo because it's at the other end (if it is an OM-2n). The levers north of the tripod mount in my photos aren't visible in the OP's photo so there isn't a way to know if they're the same or not. There is definitely a difference in the levers between OM-1s and 2s on the side of the tripod mount away from the battery, but they look identical on the other side, at least to me. I suppose it's possible that somebody took a battery holder from an OM-2n and plunked it in an OM-1n, but why? It doesn't solve the problem. Or more accurately, it solves one problem in terms of battery fit, but creates another. And it doesn't address the voltage issue at all. It also seems telling that we haven't heard from the OP. Maybe the top plates weren't switched. Maybe he just got an OM-2n instead of what he expected and didn't really look. Link to comment Share on other sites More sharing options...
mwmcbroom Posted January 16, 2018 Share Posted January 16, 2018 Sorry, I was referencing the bottom two photos only and had forgotten about that top photo. Yes, now looking at the OP's photo, it seems as if it could be an OM-2N. We'd need to see more of that camera's base area before we'd know for sure. I agree that, if the battery compartment were just plunked in, even with the diode, this doesn't resolve the voltage difference. Link to comment Share on other sites More sharing options...
Mike Gammill Posted January 16, 2018 Share Posted January 16, 2018 Well, with batteries removed try the shutter. If it fires at all speeds without batteries then it cannot be an OM-2. Link to comment Share on other sites More sharing options...
John Seaman Posted January 16, 2018 Share Posted January 16, 2018 Perhaps it's an OM10 .... Link to comment Share on other sites More sharing options...
mwmcbroom Posted January 17, 2018 Share Posted January 17, 2018 I doubt that. The OM-10 is too wimpy. Link to comment Share on other sites More sharing options...
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