Olympus OM system close-up and macro equipment
OM-Mount Photomicro Adapter H (PM-CAMS)
Introduction
The OM-Mount Photomicro Adapter H fits OM camera bodies and is an unusual part of the OM system; it was intended for attaching OM bodies to items that were not mainstream parts of the OM system. Some of the Olympus microscope literature refers to it as the PM-CAMS.
Photomicro Adapter H
Box for Photomicro Adapter H
The Photomicro Adapter H was officially used for attaching an OM body to the:
- PM-BD35A Auto Bellows of the PMT-35 Macrophotographic Equipment
- PM-D35-S 35mm SLR Camera Adapter for PM-10 series photomicrographic systems
- SZH-PT35 Photo Tube that attaches to the side of the SZH-PT Photo Tube for the SZH zoom stereo microscope
- OM Camera Back Attachment (PME3-AOM-E) for the PME3 inverted metallurgical microscope
- Olympus Motorized Operating Microscope Model OMB
It can also be used to attach an:
- OM body to the Auto Bellows
- SC 35 Type 12 camera body to Olympus colposcopes and operating microscopes
The top of the Adapter H 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 H fits into various items and is locked in place by tightening a screw that fits into the circular groove.
| Weight | ? |
|---|---|
| Microscope ref. | PM-CAMS |
| Olympus no. | ? |
| US stock no. | 105-037 |
| Introduced | ? |
| Discontinued | ? |
Versions
Only one version is known.
Similar adapters
The Photomicro Adapter H is similar to, and interchangeable with, two other adapters:
- OM camera body mount provided with the Auto Bellows
- Photomicro Adapter H2, also known as the PM-CAMS2
The significant difference between the Adapter H and the similar ones is the length of the lever that you press to release the adapter from camera body. The camera body mount for the Auto Bellows has a long lever with a black plastic cover that clashes with the overhanging pentaprism of Canon EOS digital SLRs. The Adapter H2 has a very short lever that permits unobstructed use of Canon EOS digital SLRs.
Camera body mount for the Auto Bellows (left) and Photomicro Adapter H2
Going digital
There are no moving or electrical connections between the Photomicro Adapter H (or 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 ones are full-frame bodies such as the EOS 5D Mark II, Mark III and Mark IV, the 6D and 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 thick.
The register distances for many other cameras can be found in Camera Mounts Sorted by Register.
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Created 18th April 2026 – Updated 18th April 2026
Copyright © 2026 Alan Wood