Hasselblad / Zeiss Sonnar CF 250mm f/5.6

An outdoor fashion shoot, hard noon sun, and the photographer wants the model lit by strobe while the sky goes a couple of stops dark behind her. On a 35mm body with a focal-plane telephoto you are stuck at a 1/250 sync speed and the ambient is still too hot. Put this 250mm on a 500-series Hasselblad and the leaf shutter syncs flash at every speed it has, all the way to 1/500. That is what this lens is for. Reach and full-speed flash sync in the same barrel, which is why it lived in editorial and catalog kits for two decades.

It is a Sonnar, a genuine four-element design in three groups, Cooke-triplet ancestry showing in how few air-to-glass surfaces it puts in the light path. That gives it strong central contrast, and historically it meant good flare control before coatings caught up. On the T* version the flare resistance is genuinely strong. Wide open at f/5.6 the center is already sharp, with edge uniformity treated as a lower priority than in a more symmetrical design, and a gentle falloff toward the corners that 6x6 shooters rarely worried about because the frame is so large you almost never print the extreme edges. Stop down to f/8 or f/11 and it evens out across the field.

The background rendering is what keeps people on it. At 250mm on 6x6 the angle of view works out to roughly a 135mm equivalent on full frame, but the larger format separates subject from background in a way no 135 on 35mm can match. Out-of-focus highlights stay round and clean, the transition from sharp to soft is smooth, and a half-length portrait pushes the background into a soft wash. This is a head-and-shoulders lens that also doubles for distant landscape detail. It compresses. Photographers reach for it when they want a face flattened and lifted off its surroundings.

The honest weakness is the aperture. f/5.6 wide open is slow, and on a waist-level finder in failing light, focusing a long lens at f/5.6 with the split-image is real work. There is no internal focus, the barrel is long and front-heavy, so handheld at slower speeds you will want the leaf shutter's lack of mirror slap working for you, or a tripod under it. It was never a low-light lens.

Today it sits in the affordable tier of the Hasselblad telephoto range, far below the 250mm Superachromat that people chase for the apochromatic correction, and most shooters decide the CF f/5.6 is more than enough unless they are doing technical color work. One metering note. With a leaf-shutter lens you can lean on the full slow-speed range to balance flash against daylight, so meter the ambient for the background and let the strobe carry the subject. Zone Light Meter gives you that ambient reading for the sky, and you set the shutter knowing it will sync wherever it lands.