E-M1 stray shims

Question

Olympus Camera

Repair guides and support for Olympus digital and film cameras.

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digitaltrousers @digitaltrousers

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crwdns2931729:0crwdne2931729:0: Dzi 20, 2025

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E-M1 stray shims

Hi. I bought a used E-M10 that needs repair (I think the shutter needs replacement). When disassembling the camera, I found a washer stuck to the magnets of the sensor assembly. There was another one of the same things fitted to the lens mount surround. From my reading these seem to be shims, that set the plane of the image sensor correctly. If that's the case, neither was in the correct place. Does anyone know where they go? They look similar to https://youtu.be/u3ew57pRNg4?t=231

Thanks.

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Dan @danj

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crwdns2931729:0crwdne2931729:0: Dzi 20, 2025

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You need a means to measure (without touching the CCD) the distance to the lens mount so it is optically parallel to each other. And of course this is to the hundredths of mm otherwise a part of the image will not be in focus when the aperture is fully dilated (open).

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Thanks for your reply. What's the standard location for the shims? With only two shims of very similar thickness (0.50 and 0.54mm), I can probably deduce where they live. One was actually used as a washer between the lens mount surround and its lower screw, where it wouldn't be affecting the distance between the sensor and lens. Could that just be the last guy being lazy?

crwdns2934271:0Dzi 20, 2025crwdnd2934271:0 digitaltrousers crwdne2934271:0

@digitaltrousers - There is no standard location as each camera is unique as just in the manufacturing process of the body shell there’s enough variably which is why one needs to measure.

crwdns2934271:0Dzi 20, 2025crwdnd2934271:0 Dan crwdne2934271:0

Sure, but I presume if we're looking to standardize the plane of the lens mount to sensor, there are only a few locations that shimming would affect that. I'll focus (no pun intended) on the body-to-lens-mount and sensor-to-body screws. Many thanks for your help. I will try to measure.

crwdns2934271:0Dzi 20, 2025crwdnd2934271:0 digitaltrousers crwdne2934271:0

I ended up measuring the distance between the lens mount and each post that the sensor assembly mounts to, using a caliper. I assumed that the sensor assembly itself is already correct, so wouldn't need to be factored in to the calculation. The camera needed to be largely gutted to get access, but doing so made it easy enough to see where the shims needed to go. Luckily it seems I wasn't missing any. I put them between the mounting posts and the sensor assembly.

crwdns2934271:0Mud 23, 2025crwdnd2934271:0 digitaltrousers crwdne2934271:0

@digitaltrousers - That's great news!

crwdns2934271:0Mud 24, 2025crwdnd2934271:0 Dan crwdne2934271:0

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Thanks for your reply. What's the standard location for the shims? With only two shims of very similar thickness (0.50 and 0.54mm), I can probably deduce where they live. One was actually used as a washer between the lens mount surround and its lower screw, where it wouldn't be affecting the distance between the sensor and lens. Could that just be the last guy being lazy? — digitaltrousers
@digitaltrousers - There is no standard location as each camera is unique as just in the manufacturing process of the body shell there’s enough variably which is why one needs to measure. — Dan
Sure, but I presume if we're looking to standardize the plane of the lens mount to sensor, there are only a few locations that shimming would affect that. I'll focus (no pun intended) on the body-to-lens-mount and sensor-to-body screws. Many thanks for your help. I will try to measure. — digitaltrousers
I ended up measuring the distance between the lens mount and each post that the sensor assembly mounts to, using a caliper. I assumed that the sensor assembly itself is already correct, so wouldn't need to be factored in to the calculation. The camera needed to be largely gutted to get access, but doing so made it easy enough to see where the shims needed to go. Luckily it seems I wasn't missing any. I put them between the mounting posts and the sensor assembly. — digitaltrousers

Olympus Camera

E-M1 stray shims

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