Carl Zeiss Sonnar 40mm f/2.8

The choice in the Rollei 35 world comes down to two 40mm lenses: the Tessar f/3.5 on the original camera, or this Sonnar f/2.8 on the 35S. The Tessar is the cult favorite for its slightly nervous, edgy rendering wide open. The Sonnar is the sober pick. It is the lens you reach for when you want the extra two-thirds of a stop and a flatter, more even field, and you are willing to give up a little of that ratty Tessar character to get it.

What the Sonnar actually does is hold its center sharpness wide open in a way the Tessar cannot quite manage. At f/2.8 the middle of the frame is already crisp, corners trail a little until you stop down to f/5.6 or f/8, where the whole thing snaps into proper landscape-grade resolution. This is a five-element design, a Sonnar-type computation Zeiss handed Rollei, and the bigger difference over the Tessar is the coating. The Sonnar got Rollei's HFT multi-coating, a licensed Zeiss T* equivalent, while the standard 35's Tessar was single-coated. That coating is the real source of the higher contrast you see in the negatives, the dense blacks and the clean separation in flat light. Bokeh is not the point of a 40mm f/2.8 on a tiny camera, but out-of-focus backgrounds stay smooth and unbusy. Flare control is good for a compact five-element lens, courtesy of that HFT coating, though a strong sidelight will still wash the contrast, and the 30.5mm thread is too small for most modern hoods, so you learn to shade it with your hand.

Then there is the body. Rollei crammed a full-frame 35mm camera into something that fits a coat pocket, with a collapsing lens tube that retracts when you are done. The 35S was the higher-spec sibling to the standard Rollei 35, produced through the late 1970s. It is a scale-focus camera, no rangefinder, so you guess distance or zone-focus by the depth-of-field marks. That sounds like a handicap until you have zone-focused a busy street with one and realized how fast f/8 and a fixed meter-and-a-half lets you work.

The honest weakness is that focusing. With no rangefinder you will miss frames wide open at close range, period. The f/2.8 aperture tempts you into low light where your zone-focus guesses go soft, and the viewfinder shows you nothing about focus at all. If you need confirmation, the Tessar version does not fix this either; you want a Rollei 35 RF or a different camera entirely.

The leaf shutter sits inside the lens, which means flash sync at every speed up to its 1/500 top. Portrait and fill-flash shooters still buy these for exactly that. It also means the slow end matters: at a quarter second or a half second in dim interiors, set Zone Light Meter to that exact shutter speed and let it solve the aperture, because the in-lens shutter is honest about its slow speeds in a way focal-plane shutters of the era often were not.

These trade for real money now, more than the Tessar 35, and the buyers are not nostalgists. They are travel and street photographers who want a sharp 40mm that disappears into a jacket. The rival is not another brand. It is the Tessar sitting right next to it on the shelf.