23.2mm Microscope Eyepiece Port to Canon EOS DSLR Lens Adapter — Metal Bayonet Mount

This adapter is designed for microscopes with a standard 23.2mm eyepiece port — the most common diameter found on biological, compound, and trinocular microscopes. Measure the inner diameter of your microscope's camera port or eyepiece tube. If it measures 23.2mm (approximately 0.91"), this adapter will generally fit. Most major brands including Olympus, Nikon, Zeiss, Leica, Motic, and AmScope use this standard.

This adapter uses a Canon EOS bayonet mount, compatible with Canon EOS DSLR bodies including the Rebel series (T3i, T5i, T6i, T7i, T8i), EOS 70D, 80D, 90D, 5D Mark II/III/IV, 6D Mark II, and 7D Mark II. It is not designed for Canon RF-mount mirrorless cameras (EOS R series) without an additional EF-to-RF mount adapter.

The 23.2mm eyepiece tube diameter is the internationally recognized standard for most biological and compound microscopes. It is used by Olympus, Nikon, Zeiss, Leica, Motic, AmScope, and many other manufacturers. If your microscope has a trinocular head or a dedicated camera port, it most likely uses this 23.2mm standard. Some older or specialized microscopes may use different diameters (e.g., 30mm or 30.5mm) — verify your port size before ordering.

Some vignetting or field-of-view cropping is possible depending on your microscope's optical design and your Canon camera's sensor size. APS-C sensor bodies (Rebel series, 70D, 80D, 90D, 7D) generally show less vignetting than full-frame bodies due to their smaller crop factor. The all-metal construction helps maintain optical alignment and minimizes image degradation from flex or misalignment that can occur with plastic adapters.

In most cases, this adapter connects directly between your microscope's 23.2mm camera port and your Canon EOS body with no additional parts required. For best results, using a Canon remote shutter release or tethering software (such as Canon EOS Utility) is generally recommended to minimize camera shake during capture. A sturdy microscope stand also helps reduce vibration.

Yes. Canon EOS DSLR cameras support video recording, and this adapter allows you to use your camera's video mode to capture microscope footage. Live View mode is generally recommended for both video and still photography through a microscope, as it allows real-time framing on the camera's LCD without the mirror-slap vibration of the optical viewfinder.

Yes. The all-metal body provides greater rigidity and durability compared to plastic adapters, which is important in lab or classroom environments where the adapter may be attached and removed frequently. Metal construction also maintains consistent optical alignment between the microscope port and the camera sensor over repeated use cycles.