LZOS Industar-61 L/Z 50mm f/2.8

The engraving on this fifty reads like half a materials report. LZOS, the optical glass plant at Lytkarino outside Moscow, put L on the ring for lanthanum glass and Z for zerkalny, the Russian word for mirror. Z marks it as the SLR version, as distinct from the rangefinder Industar-61. The formula itself came from GOI, where G. Slyusarev and V. Sokolova had computed the Industar-61 as a Tessar type with four elements in three groups. This version pairs lanthanum glass with an M42 thread for the Zenit SLRs, which makes it a small, slower alternative to the Helios-44 that most of those cameras wore.

Twelve centimetres separate it from its KMZ cousin. The Industar-61M built at KMZ stops focusing at 0.42 m; this one goes to 0.3 m, and that gap changes what the lens is for. At the closest mark you frame an area a little smaller than a postcard, roughly a quarter life-size, close enough for a wristwatch face or a single rose without an extension tube in the bag. Focus travel that long costs light. Near the closest mark the extension works out to around two thirds of a stop. A Zenit metering through the lens sees the loss on its own; a handheld reading does not, and Zone Light Meter will compute the factor from the magnification so the negative doesn't come back thin.

Sharpness follows the Tessar pattern. The Soviet test sheet rated it at 42 lines/mm in the centre and 30 at the edge, which on film reads as a crisp middle at f/2.8 and corners that want a stop or two more before they catch up. Contrast is decent for a lens that is coated but not multicoated, though with a bright light source just outside the frame it flares sooner than the later MC version, so a 49mm hood belongs on it. The out-of-focus look is a large part of the appeal. At middle apertures the blades can give specular highlights an angular, sometimes star-like outline on some copies, which some shooters go looking for and others find distracting on night streets. Wide open, before the blades intrude, the highlights are round again.

Where it falls short is the diaphragm, which has no auto pin and no preset ring. It is a plain manual iris. You focus wide open, turn the aperture ring, and watch the finder go dim. On a Zenit that meters stopped down, that hardly changes your routine. On a body designed around auto-diaphragm lenses, you give up the bright finder you paid for. And f/2.8 is a full stop slower than the f/2 Helios-44, which you will notice indoors at dusk.

At about 225 g it is a little lighter than a Helios-44, and it takes common M49 x 0.75 filters, so ND and colour filters are cheap to find. Copies are inexpensive on the used market. One engraving trap is worth knowing: some export copies of the later MC version are marked MS by mistake, so an MS ring means you are holding the multicoated lens, not this single-coated L/Z.

Buy it if your M42 kit lacks close focus, or if you want Tessar-type rendering in a slightly smaller package than the Helios. Portrait shooters after a big soft wash behind the subject should look elsewhere. Tabletop work and the small still lifes you stumble on during a walk are where it earns its place in the bag.