Carl Zeiss Jena 5cm f/2 Sonnar which has been fully restored and converted to Leica LTM with RF coupling. Lens also includes a 6-bit code LTM to M adapter. Helicoid mechanics were modified to permit closer focusing.
Mechanics were ultrasonically cleaned, polished, and reassembled using synthetic low-outgassing lubricants. Aperture control system was also rebuilt and all old grease/ oil purged out of the assembly. Helicoid was polished for smooth focus action. The lens focuses from 0.7m to Infinity with RF coupling to drive the rangefinder system on Leica rangefinder style cameras. Brass ‘Air-Feel’ focus stick installed. Lens is very quick and tactical to focus with. This is the deluxe version of our restored Carl Zeiss Jena lenses we usually save for the highest performing specimen. This entails the Air-Feel helicoid mod, Brass Focus Stick and 0.7m MFD RF cam mod.
Optics were cleaned and centered for maximum sharpness. The optics are of the early single coated/ uncoated formula. The front element is single coated, and the internal elements are uncoated. There is some micro-air bubbles inside some glass elements, which is very typical of these early Carl Zeiss Jena lenses and reflect the German Schott glass recipe used during that time.
Optical condition is excellent. The front element shows no scratches, coating or cleaning marks. The rear element is also in excellent condition with a few very minor cleaning marks. A few minor specks of dust inside.
Lens has been calibrated for f/2 aperture. From f/4 thru f/5.6 there is focus shift (aka: sonnar focus shift).
Lens includes a front push on metal cap and a rear plastic M cap.
Like all our Sonnar restorations, it includes a 1 year warranty also on all work.