Carl Zeiss Planar T* 85mm f/1.4 (C/Y)

It is past midnight in a hotel room and someone is shooting a portrait by the light of one practical lamp. The Planar 85 is wide open at f/1.4, focused on an eye, and the background has already dissolved into smooth color. Contax sold a lot of RTS and Aria bodies on the strength of this single lens. People bought into the whole system to get this in front of them.

The optical design is a classic Planar, the double-Gauss that Zeiss has been refining since Paul Rudolph drew the original in 1896. Six elements in the modern configuration, T* multicoated, and it behaves exactly the way a good fast double-Gauss should. Wide open it is soft in a flattering way, a little glow on specular highlights, contrast pulled back so skin reads gently. The center sharpens fast as you stop down and by f/2.8 to f/4 it is genuinely crisp across most of the frame. The signature is the transition. Focus does not snap off a cliff; it rolls. That gradual falloff from a sharp eye into soft shoulder into melted background is the thing portrait shooters chase, and few lenses do it with this much grace.

Then there is the color. Zeiss T* rendering means saturated but not loud, with a particular warmth in skin tones and a microcontrast that gives faces dimension even when overall contrast is low. Bokeh is rounded and clean in the center, though it cat-eyes toward the corners wide open the way nearly every fast 85 does. Flare resistance is good for the era but not bulletproof; backlight it hard and you can pull a low-contrast veil, which some shooters use on purpose.

There are versions worth knowing. The early AEG lenses are German made (roughly 1975 to 1985). The MM run started in Germany, the MMG, and that German production wound down in the late 1980s. The Japanese MMJ came a few years later in the early 1990s, built by Yashica's Tomioka optical division and then Kyocera, so the two never actually overlapped on the line. The German AEG copies carry a cult premium among collectors who swear the rendering is dreamier. Most of that is folklore. Optically they are very close.

The honest weakness is field curvature. Shoot a flat subject, a wall of text or a group lined up on one plane, and the corners go soft while the center holds, or the reverse depending on where you focused. For its actual job, a single face in shallow focus, this never matters. For copy work or environmental groups wide open, it bites.

Today it lives in the shadow of its own legend and the price has climbed because of it. People cross-shop it against the Nikkor 85mm f/1.4 Ai-S and the modern Zeiss Otus, and against its own Contax 85mm f/2.8 sibling for those who want sharper and lighter. It still sells because nothing in this focal length renders a face quite like it on film. With the 67mm front you can stack an ND to hold f/1.4 in daylight, and when you are metering wide open by one dim lamp, set Zone Light Meter to f/1.4 and let it place the shadow where you want it rather than guessing into the dark.