Carl Zeiss Planar T* 55mm f/1.2 (C/Y)

Only about a thousand of these ever left the factory, and that scarcity is the first thing anyone mentions. The Planar 55mm f/1.2 is the one C/Y Zeiss that owners talk about in lowered voices. Most photographers who shoot the Contax system never handle one. They cannot find it, and when they do the asking price runs closer to a used car than a used lens. Zeiss issued it as a small limited run, and that run was little enough that it was a collector's object from the day it shipped. It shares the f/1.2 ceiling on the C/Y mount with the Planar 85mm f/1.2; nothing Zeiss built for the bayonet opens wider.

Optically it is a Planar, the double-Gauss layout Zeiss has built variations of since the original patent in 1896, here pushed to an aperture the design barely tolerates. It is built to hold its correction as you focus close. Wide open at f/1.2 you get a thin slice of focus, a gentle spherical glow around specular highlights, and backgrounds that melt rather than break apart. It is not a clinical lens, and that softness is the reason to own it. The T* coating keeps contrast honest into side light, though aim it straight at a bare bulb at f/1.2 and veiling flare washes the frame. Stop down to f/2.8 or f/4 and the glow burns off, the field flattens, and resolution snaps up to match any normal lens of its generation.

The 55mm length is the quiet tell. Zeiss went a hair past the standard 50 to ease the optical load of that aperture, and the slightly tighter frame happens to suit faces. Point it at one person in a dim room, open it up, and everything behind them dissolves. It rewards careful focus and punishes the sloppy kind just as hard, because at f/1.2 the depth of field on a head-and-shoulders frame is a few centimeters. Manual focus on a 35mm split-prism screen is doable but tense.

The honest weakness is the one every f/1.2 carries. It is a specialty optic, not a daily driver. It is heavy, the 67mm front is large for a normal lens, and wide open the longitudinal chromatic aberration paints green and magenta onto bright out-of-focus edges. Most owners shoot the few f/1.2 frames they bought it for and run the rest of the roll at f/2 to f/4, where a Planar 50mm f/1.4 delivers nearly the same picture for a fraction of the money and weight. You pay here for the rarity and that last stop, not for value.

When you do open it up, meter at the working aperture. Zone Light Meter lets you set f/1.2 as the taking aperture so the reading reflects the light you are actually gathering, which matters when you are fighting to keep a handheld shutter speed off the floor. Today the lens sits in an odd spot. The price says keep it safe; the way it draws says go shoot. Owners tend to shoot it, which is the right instinct.