This lens replaced its predecessor Industar-26m as a standard lens on the FED-3 and early FED-4 cameras. The optical design of the Industar-26m was improved and aperture stop-clicks were introduced.
This is one of the newer multicoated M39 lenses made by the Soviet (now Ukrainian) photo industry. It is sharp and contarsty, with smooth focusing action and the aperture click-stops. The lens later evolved in all-black Industar-61LD.
The lens was also made in universal 42mm mount for Zenit cameras, named Industar-61L/Z.
Focal length: 53mm
Aperture: from 2.8 to 16, Click-stop settings
Field of coverage: 45°
Focusing: 1m - Infinity
Filter size: M40.5x0.5mm
Optical registration (back focus): 28.8± 0.02mm
Mount: M39x1mm. The lens mounts and RF couples with any Leica or Leica copy (FED, Zorki etc.)
The glass is coated; the barrel has chrome finish with black enamel rings.
Image #2: very early chrome I-61 (sovietcams.com)
Known serial numbers:
#lens ______ #cam/type _____ mm _ blades ________________ owner/source
005530 ____ ? ______________ 52 _______________________ fotoua zebra type 1
061844 ____ lens only ________ 52 _ 10 ___________________ ebay
098473 ____ lens only ________ 52 _ 10 ___________________ ebay