Carl Zeiss Planar 75mm f/3.5

The Planar on a Rolleiflex 3.5F outresolves the film you load behind it, and it has done so since 1958. The only serious argument Rollei owners have ever had about it is whether Schneider's Xenotar is its equal, and on a contact sheet you cannot tell the two apart. Both are advanced double-Gauss designs, both a clear step up from the four-element Tessar/Xenar type that sat on the cheaper bodies, the Tessar on the budget Rolleiflexes and the Xenar (or the three-element Triotar) on the Rolleicords. The rest is tribal.

Flat field is the whole point, and the negative shows it. Sharpness holds from the center to the edges of the 6x6 frame, strong wide open at f/3.5 and biting by f/5.6, and by f/8 it matches anything you can put on 120. Contrast runs high for a lens of this age, color is neutral with a faint warmth, and the out-of-focus rendering stays calm rather than showy. No swirl, no nervous edges. At f/3.5 across a square negative there is still enough separation to lift a head-and-shoulders portrait off its background. Optically it is a six-element double-Gauss in the classic Planar formula, and that is the normal lens for the format.

This is the glass that lived on the camera every studio kept loaded and every waist-level street photographer carried. Generations of TLR shooters worked through Rolleiflexes for portraiture, documentary, and the kind of square street frame the format made famous, and the 3.5F was the last and most refined of the 3.5 line, built from 1958 to 1976 with the Planar as its top taking lens. The leaf shutter is part of why it works on the street. Nearly silent, it disappears.

Because the shutter sits inside the lens, flash syncs at every speed up to 1/500, which no focal-plane medium-format body can do. Meter the ambient in Zone Light Meter, then drag the shutter or knock down a bright sky with fill and the leaf shutter never fights you. The selenium meter built into the 3.5F is usually dead or lying by now, so an outside reading is not really optional anyway.

The honest weakness is the coating. This Planar is single-coated, so point it into the sun without the Rollei shade and you get veiling flare and a contrast drop a modern multicoated lens would shrug off. Hood it and the problem mostly goes away. A clean 3.5F is four-figure money now, and the eternal cross-shop is the 2.8F: that one buys a stop and shallower depth, this one is the slightly sharper, slightly more contrasty optic, and plenty of working photographers chose it for exactly that.