Carl Zeiss Planar T* 85mm f/1.2 (C/Y)

Put this next to the Canon EF 85mm f/1.2L and people expect a wash. They are surprised. The Canon focuses by motor and renders soft wide open in a dreamy, low-contrast way; the Planar focuses by hand only and gives you its own version of that wide-open glow, smooth and controlled rather than mushy, with the Zeiss color sitting underneath it. The Zeiss is the one portrait shooters reach for when they want the background to dissolve cleanly behind the subject and the wide-open look to feel like rendering rather than a defect, knowing the bite comes back as they stop down.

Under the skin it is a double-Gauss derivative, but stretched well past the classic six-element Planar: eight elements in seven groups, with a floating element that holds correction at close focus. That extra glass is exactly what buys the f/1.2. It is also why the front group is enormous, why the filter thread is 82mm, and why the lens is genuinely heavy in the hand. By f/2.8 the center firms up and the Zeiss look starts to pop, and by f/4 the whole frame is tack sharp corner to corner. Wide open, the out-of-focus rendering is smooth and rounded with no nervous edges, and color sits warm and saturated, with flare resistance that stays respectable for such a large front element. Shoot it straight into a window, though, and you will get a little veiling.

The famous quirk is focus shift. As you stop down from f/1.2 the plane of best focus creeps backward slightly, so a shot nailed wide open on the focus aid can land a hair behind the eyes by f/2.8. On an SLR you compensate in your head, or you focus and recompose carefully. This is the price of the design, and it is real. The other honest weakness is the depth of field itself. At f/1.2 on 35mm, a portrait gives you maybe an eyelash of sharpness; miss by a centimeter and the shot is gone. There is no autofocus to save you.

Wedding and editorial portrait people shoot it on film bodies like the Contax RTS III or the RX, and a whole wave of mirrorless shooters adapt it because the rendering reads differently from anything modern. It was never a mass-production lens. Zeiss sold it only as limited anniversary runs, the 60-year edition arriving around 1992, so survivors are scarce and the used price is steep and climbing. The obvious cross-shop is the Leica 90mm Summicron for outright sharpness or the Canon 85L for autofocus convenience, but neither gives you the Planar's specific mix of glow and creaminess at f/1.2.

A metering note worth keeping in mind. This is a no-shutter SLR lens, so the body controls exposure, but at f/1.2 you are often shooting in the kind of light where a careful reading matters most. Meter for the skin you care about and set Zone Light Meter to place that value where you want it, because at this aperture the highlight on a cheek and the shadow under a jaw can sit five stops apart, and the wrong placement blows one or buries the other. The thin slice of sharp focus does not forgive a sloppy exposure on top of a sloppy focus.