Hasselblad / Zeiss Distagon CF FLE 40mm f/4

Picture a square-format landscape shooter on a tripod at the edge of a canyon, 503CW in hand, reaching for the one lens in the bag that turns the whole scene into a wall of detail corner to corner. On the Hasselblad V system, that lens is the 40mm Distagon. It is the widest rectilinear glass in the standard V lineup, and on 6x6 it gives roughly the angle of a 22mm or 24mm on full frame. The job it exists for is narrow and specific: get genuinely wide on a medium-format negative without the geometry falling apart at the edges.

The FLE in the name is the whole point. It stands for Floating Lens Element, an internal group that shifts as you focus to hold correction across the range. Earlier 40mm Distagons were sharp at infinity and went soft up close because a retrofocus wide on a square frame fights field curvature hard. The CF FLE fixed that. Stopped to f/8 or f/11 it renders flat fields with even sharpness into the extreme corners, which is exactly what you want when there is fine architecture or foliage running to the edge of the frame. Wide open at f/4 the center is already crisp; the corners want a stop or two. Contrast runs high and the rendering stays clean in deep shadow, and the multicoating holds backlight well for a wide this size, though a 93mm front element catches enough light that a shade is not optional.

That 93mm filter thread is the practical headache. It is a giant, expensive, bayonet-93 size, and if you do graduated ND or polarizer work for landscape you are committed to a specialty filter set or a square holder on an adapter. Plan the budget for glass before you plan it for the lens. When you do drop an ND or grad on the front, Zone Light Meter's filter-factor compensation will fold the stop loss into your reading so you are not metering the scene and then guessing the correction in your head.

Be clear about the trade you are making. This is a heavy, slow, physically enormous lens, and at f/4 it is not a low-light tool. Distortion is well controlled for the angle but not zero, so dead-straight horizons near the frame edge can show a hair of bow. None of that matters much for the work it does, which is deliberate, tripod-bound, stopped-down landscape and architecture.

Like the rest of the CF series it carries a Prontor leaf shutter in the barrel, so flash syncs at every speed up to 1/500. For an ultra-wide that mostly matters in interiors and architecture, where you want to balance a dim room against bright windows with fill flash and need sync to hold at a fast speed. The trade is the same as the rest of the system: top speed caps at 1/500, so in blazing sun on fast film you lean on the aperture and on ND rather than the shutter.

Today the CF FLE is the one to chase over the older non-FLE 40mm, and prices reflect it. It is the priciest wide in the standard CF lineup, and the only real alternatives are the later CFE version or going to a 50mm and cropping. If you shoot square-format wide on film, this is the lens you end up wanting.