• Welcome to Photrio!
    Registration is fast and free. Join today to unlock search, see fewer ads, and access all forum features.
    Click here to sign up

Curtain tension of om-10

stammu

Member
Allowing Ads
Joined
Aug 11, 2025
Messages
13
Location
Greece
Format
35mm
hello all, so i ended up testing my moms old om-10 and the shutter speeds are ofd with the biggest difference for example being the 1/1000 measuring at 1/521 i had already cleaned the mirror magnet and it seems to function properly so could it be that the curtains arent opening correctly if so would Messing with this (picture attached) yield me any results on getting the speeds correctly? (From the diagram this should be on the bottom cover of the mechanism or am i naive to think a camera known for many faults is that easy to mess with)
 

Attachments

  • Screenshot_2025-08-16-16-39-11-82_40deb401b9ffe8e1df2f1cc5ba480b12.jpg
    107.4 KB · Views: 62
ic-racer said:
12 milliseconds
Click to expand...
so i thought it could be a magnet issue but my om-10 seems to be a late serial number so different design and less prominent to sticky magnet i did clean the contacts but nothing changed and it seems to operate fine, i got no idea if i should try and find a way to access the curtain tensioning thing i posted above or forget about it, the repair manual i've found seems to be for earlier models
(shutter speed at 1/1000 caps at 1/500 etc everything is just slower for whatever reason)
 

Attachments

  • adawd_50.png
    393.2 KB · Views: 63
  • wdawd_50.png
    589.8 KB · Views: 66
See if you get different results if you use it in auto exposure mode.
There could be an issue with the manual exposure accessory.
 
Without a way to measure curtain travel times, you really can't adjust the shutter curtains. And, just taking a reading of the film plane in one spot (center?) will not yield good results. I'd recommend cleaning all the parts that move when the curtains are released and lubricating necessary parts as shown in the manual. Doing this will resolve most shutter issues, cranking up curtain tensions will not.
 
I Will try that tysm!, oh the film plane reading thing has gotten me curious what should i do to take better measurements if center metering isn't accurate?
Edit: Also what kind of lubrication would u suggest i got nothing outside some sewing machine oil but im sure that might not be something i'd wanna use!
 
Last edited:
I've been servicing OM for over 45 years and was a tech at Olympus in NY. From birth, the OM-10 had high speed shutter problems. main problem is plastic gearing in the shutter and no ball bearings. To make up for no BB, Olympus applied too much silicon lube. The shutter gears spin around and spray this lube on the electromagnet. High speeds, especially 1000 would over expose A LOT. 1/521 is only 1 stop. Some OM-10 overexpose a lot more and the amount of over exposure increases if the camera sits with the shutter wound. High speeds are adjusted by bending the gold wire switch in front of the electromagnet. But first, magnet has to be cleaned of excess oil using a degreaser.
 
I have a number of OM bodies. My OM2N needs service. My OM2S works but has a battery drain problem so I must remove the batteries after each use. My OMPC and OMG cameras were working properly the last time I used them. I don't know how many OM10s I have. My back-ups? My two OM2000 cameras. I know that Cosina made them but they are fairly simple and there are many spare parts from other Cosina made cameras that can be used to keep them going. The downsides of the OM2000, for me, is that it isn't compatible with the interesting Olympus flash system and doesn't have interchangeable focusing screens. I have most or all of the focusing screens which fit my OM2 cameras. The OM2000 cameras give me more assurance that I will have something to use my Zuiko and OM mount lenses on in the future.
 

I am preparing for future retirement and as of July 2024 no longer offer service for many models . Note battery drain in the 2S cannot be fixed.
I now service the following models exclusively: OM-1N, 2N, 2S, 3Ti, 4T, 4Ti.
 
You must log in or register to reply here.
Menu
Log in
Register