Jupiter 12 35 mm f/ 2.8 Lens Handbuch
Jupiter-3 Clean and Lube. The 39mm focus mount of the Jupiter-3 is a simplified and
improved mount compared with the wartime Zeiss mount for the Sonnar 5cm F1.5. The
Russian mount maintains compatibility with the optics module of the Zeiss lens. The
mechanism breaks down to five units: 39mm mount, inner helical, outer helical with an
inner “sleeve”, and focus ring. I prefer to clean the outer helical with the inner sleeve
partially unscrewed, but not completely separated.
improved mount compared with the wartime Zeiss mount for the Sonnar 5cm F1.5. The
Russian mount maintains compatibility with the optics module of the Zeiss lens. The
mechanism breaks down to five units: 39mm mount, inner helical, outer helical with an
inner “sleeve”, and focus ring. I prefer to clean the outer helical with the inner sleeve
partially unscrewed, but not completely separated.
For the disassembly, you will need a set of fine screwdrivers- either jeweler’s or from an
eye-glass repair kit; a compartmented tray such as an ice cube tray; grease, such as white
lithium grease; solvent- such as Isopropyl alcohol or lighter fluid; and a flat work surface-
such as a cafeteria tray. I line the tray with a layer of small-size bubble wrap and white
paper towels. This dampens anything that falls from the lens- such as set screws.