Hasselblad / Zeiss Distagon CFi 50mm f/4

Point this lens at a building and the verticals come back straight. That is the practical reason it lives in a Hasselblad bag instead of something cheaper. The Distagon 50mm CFi controls distortion to a degree that surprises people coming off 35mm wide angles, and it holds field flatness across the 6x6 frame, so horizons and architecture do not bow at the edges. Zeiss built it as a retrofocus design, the only way to get a 50mm (roughly a 28mm equivalent in 35mm terms) to clear the SLR mirror box on the V system. The penalty for that geometry is bulk. It is a heavy piece of glass, and you feel it on the front of a 500-series body.

Wide open at f/4 the center is already sharp, the corners catch up by f/8, and by f/11 the whole frame is even. On 120 film that means landscapes with very high resolution and tonal gradation that holds in the deep shadows. The T* coating handles flare well for a wide of this era, though shoot into a low sun without the hood and veiling will drop your contrast. The rendering is high microcontrast and neutral in color, with no swirl or softness to the out-of-focus areas. This was never a portrait lens and does not pretend to be one.

Who shoots it: medium-format landscape and architectural photographers, the people loading Velvia or Ektar in a 500-series body and working off a tripod. The 50mm and the 80mm Planar are usually the first two lenses a V-system shooter owns. It is also a dependable studio wide for product and interiors, anywhere you need geometry you can trust.

The honest limitation is close focus. Like most retrofocus medium-format wides it does not get near macro range, even with the floating element design that keeps the corners honest at the near end. If you want intimate detail work, reach for a Makro-Planar instead. The other practical cost is filters: this lens uses the Bayonet 60 filter mount, the same B60 series carried by most of the V-system primes, and good multicoated B60 glass is not cheap.

It carries a Prontor leaf shutter built into the barrel. The CFi refines that Prontor with an improved main spring for longer life and better precision over the CF, and it is a far cry from the Synchro-Compur in the original C lenses. The payoff is flash sync at every speed up to 1/500, which matters for fill flash outdoors or balancing strobe against daylight, and the slow end runs down to 1 second and bulb. Metering a dim interior on slow film, set your shutter speed in Zone Light Meter and let it hold the reading; the leaf shutter gives clean sync at any aperture, with no focal-plane flash ceiling. Set ND or grad filters at the B60 mount for long exposures and meter accordingly.

Today the CFi versions sit at the top of the used-Distagon price ladder, above the older C and CF variants, partly for the improved ergonomics, contrast, and the upgraded shutter and PC-sync socket. People cross-shop it against the Mamiya 7's 43mm and 50mm rangefinder wides, smaller and arguably sharper but tied to a different system. For anyone committed to the Hasselblad V body, this is still the wide most shooters settle on, and the leaf shutter is a large part of why.