Olympus OM system close-up and macro equipment
OM-Mount Photomicro Adapter H2 (PM-CAMS2)
Introduction
Camera mount for the Auto Bellows (left) and Photomicro Adapter H2
The OM-Mount Photomicro Adapter H2 fits OM camera bodies but was not sold as part of the OM system; it was intended for attaching the SC 35 Type 12 camera to Olympus colposcopes and operating microscopes. It is included here because it provides a good way of connecting Canon EOS digital SLR cameras to the Auto Bellows. Some of the Olympus microscope literature refers to it as the PM-CAMS2. It is similar to 3 other mounts:
- OM mount provided with the Auto Bellows (long lever)
- Photomicro Adapter H, for attaching an OM body to the PM-D35-S 35mm SLR Camera Adapter for PM-10 series photomicrographic systems (medium lever)
- PM-CAMS, for attaching an OM body to the PM-BD35A Auto Bellows of the PMT-35, or to the SZH-PT35 Photo Tube that attaches to the side of the SZH-PT Photo Tube for the SZH stereomicroscope
The significant difference between the Adapter H2 and the similar ones is the length of the lever that you press to release the adapter from camera body. On the Adapter H2, this lever is very short, so when used in conjunction with an adapter for Canon EOS digital SLRs, the lever does not clash with the overhanging pentaprism and there is no need to use an extension tube.
The top of the Adapter H2 has the same fitting as the rear of a lens, and attaches to an OM camera body in the normal way. The bottom of the Adapter H2 fits into the rear standard of the Auto Bellows and is locked in place by tightening a screw that fits into the circular groove.
Side view of camera mount for the Auto Bellows (left) and Photomicro Adapter H2
| Weight | 53 gm |
|---|---|
| Microscope ref. | PM-CAMS2 |
| Olympus no. | 7-C535 |
| US catalog no. | 310-1100 |
| Introduced | ? |
| Discontinued | ? |
Versions
Only one version is known. The Photomicro Adapter H is very similar, but has a longer lever for releasing the camera.
Going digital
There are no moving or electrical connections between the Photomicro Adapter H2 and the Olympus OM camera body, so it is easy to adapt digital camera bodies that are less deep than the OM, and Canon EOS digital SLRs and mirrorless cameras are often used. The most suitable are full-frame bodies such as the EOS 5D Mark II, Mark III and Mark IV, the EOS 6D and EOS 6D Mark II, the R8 and the RP, because they have a sensor the same size as 35 mm film.
Olympus OM 35 mm camera bodies and the SC 35 Type 12 scientific camera have a register distance of 46.0 mm from the film plane to the front surface of the mount for lenses. Canon EOS digital SLRs have a corresponding distance of 44.0 mm, and so they need an adapter 2.0 mm thick when they are used to replace an Olympus body. Canon EOS R mirrorless cameras have a corresponding distance of 20.0 mm, and so they need an adapter 26.0 mm thck.
The register distances for many other cameras can be found in Camera Mounts Sorted by Register.
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Created 18th February 2017 – Updated 17th March 2026
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