Carl Zeiss Planar T* 50mm f/1.4 (C/Y)

The cheaper sibling has a real claim on this lens, and plenty of people who have shot both make it. The Contax/Yashica Planar 50mm f/1.7 is the value pick: a touch sharper wide open, cleaner in the corners, smaller, and cheaper on the used market. So why does the f/1.4 keep selling? Two reasons. The extra two thirds of a stop changes what you can shoot, and wide open this lens renders in a way the f/1.7 never quite matches. You pay more for softer corners and a more atmospheric look at f/1.4, and the f/1.4 answers back with higher central resolution and more bite once you stop it down.

The optics are a double-Gauss derivative, 7 elements in 6 groups. Planar is the name Zeiss has used for this layout since 1896, though the fast f/1.4 version splits the front component into two elements and is no longer truly symmetrical. The C/Y version wears the T* multicoating that holds contrast against backlight better than most fast fifties of its generation. By f/2.8 the center is biting and the midframe is good, but the corners do not fully clean up until f/4 to f/5.6, which only matters for flat-field landscape work. Wide open it is honest about the compromise: a touch of veiling glow, focus that falls off fast into smooth out-of-focus areas, and the slightly nervous bokeh that double-Gauss designs produce when point lights sit just behind the subject. It draws faces with real depth. Foliage backgrounds can get busy.

Shoot into a window or a low sun and the T* coating keeps color in the frame where a single-coated lens of the same era would milk over and wash flat. Field curvature is mild. The color leans cool and saturated, with a particular handling of greens and skin tones that color-negative shooters tend to either embrace or correct toward neutral in post.

This was the standard fast normal for the Contax SLR system, so it lived on the cameras of editorial and portrait shooters through the eighties and nineties, anyone who wanted Zeiss glass without the Hasselblad budget. The honest weakness is the corners wide open. They stay soft well past f/2.8, which matters for landscape work and almost never for the portraits and street frames most people buy this lens to make. Today it cross-shops against adapted Canon and Nikon 50mm f/1.4 glass and the modern Zeiss Milvus and Planar ZE/ZF reissues, and it holds value because the C/Y rendering has a following the spec sheet does not fully explain.

Practical note: wide open at f/1.4 is exactly where this lens earns its price and exactly where a reflected meter reading gets thrown by the out-of-focus highlights it loves. Take your reading off the subject in Zone Light Meter and place the skin where you want it before you let the background pull the exposure around. The 55mm filter thread takes ND if you need to hold f/1.4 in daylight.