Hasselblad B50
A 50mm bayonet filter mount used on early C-series lenses of the Hasselblad V system
Overview
The Hasselblad B50 is not a camera or lens, but a 50mm metal bayonet filter mount used on C-version lenses of the Hasselblad V system. It is also known as Bay 50 and was designed for accessories like filters, lens hoods, and close-up lenses. The B50 mount appears on lenses such as the ZEISS PLANAR 80mm f/2.8 C and the Zeiss Sonnar 250mm f/5.6 C. Later CF versions of these lenses moved to the larger B60 bayonet mount, marking the B50 as part of the earlier V-system accessory standard.
Specifications
| Product type | Filter adapter ring size for the Cokin System A filter system |
| Mount type | B50 bayonet (metal 50 mm Bayonet) |
| Compatible lenses | ZEISS PLANAR 80mm f/2.8 C, Zeiss Sonnar 250mm f/5.6 C |
| Successor mount | B60 (on CF lens versions) |
Design
The B50 is a metal bayonet mount used on the accessory thread of Hasselblad V system C lenses. It supports a range of original Hasselblad accessories including haze filters, color correction filters, lens hoods, and close-up lenses. The mount is also compatible with adapter rings from the Cokin System A, which lists Hasselblad B50 among its available diameters.
Context
The B50 mount was part of the early accessory ecosystem for the Hasselblad V system. It was succeeded by the larger B60 bayonet on CF-series lenses, indicating a shift toward bigger filter diameters. The B50 remains associated with classic C lenses produced from the late 1950s onward.
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