Contax G is a distinct camera-system designation. ZEISS identifies the Contax G camera mount and an autofocus connection on its historical Biogon T* 2.8/21 data sheet; adapted operation requires an exact adapter and clearance check. A similarly named mount from another system is not a direct-fit substitute.
What this name establishes
ZEISS identifies the Contax G camera mount and an autofocus connection on its historical Biogon T* 2.8/21 data sheet; adapted operation requires an exact adapter and clearance check It establishes the system family; it does not by itself certify every electronic function or guarantee safe clearance for adapted lenses.
What the ZEISS sheet actually confirms
The ZEISS Biogon T* 2.8/21 data sheet names “Contax G” as the camera mount and describes the lens as designed for the autofocus connection of Contax G compact cameras. Its specified M55 × 0.75 filter connection is a front filter thread, not the rear camera mount.
That single lens document does not establish an adapter fit on Sony E, Fujifilm X or any other digital body. Adapter drive, rear-element clearance, aperture operation and image coverage need the exact lens and adapter documentation before a verdict is issued.
How to verify a combination
- Read the exact mount on the camera and lens.
- Check the maker’s compatibility list for that model.
- If an adapter is needed, confirm the direction and lens exclusions.
- Check crop, AF, aperture and stabilization separately.
Published models
0 published source-linked model records use this mount label. This sample does not turn every cross-brand pairing into a confirmed combination.
No exact profile has cleared the source check for this category yet. Use the official maker resource and verify the complete model designation.
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Official sources and scope
Checked for this reference on October 30, 2026. Product firmware and support lists can change; inspect the current maker page for your exact revision.