I am selling a German Isco Göttingen Isconar 135mm f4 lens, M42 thread. In excellent condition, no scratches on the glass. Front and back cover included.Production number: 4126058Number of shutter slats: 14The price is fixed €4 shipping (cash on delivery by mail).If you are interested, I also offer a reduction (adapter) for the lens for:- Canon EF/EF-S Mount- Canon EOS R, price €20- Nikon F-mount AI- Sony NEX E-Mount, price €7, fits on NEX- 5 NEX3 Nex-C3 Nex-5N Nex-7 NEX-6 NEX-5r NEX-VG10...- Fujifilm (M42-FX), price €9, fits Fujifilm x X-Pro1 FX XPro1 S2 Pro, S3 Pro, S5 Pro... Does not fit Fujifilm X-T4!- Samsung NX (M42-NX), price €8, fits Samsung NX (NX-5, NX-10, NX-11, NX-20, NX-100, NX-200, NX-210, NX-300, NX-1000, NX-1100, NX-2000, NX...)- Nikon 1 N1 Mount, price €9, fits on j1 ​​j2 j3 v1 v2 v3 ...- M4/3 (Micro 4/3), price 10€Reductions for Nikon F-mount AI I have two types:- without glass 4€- with glass allowing focus to infinity 8€ - I sell this only together with the lens !!!Both fit the D70s D90 D3100 D100 D7000 D300 D700 D4...I have two types to choose from for the Canon EF/EF-S Mount:- reduction without electronics - confirm chip worth €4- reduction with electronics - confirm chip worth €8. The AF 3.0 chip confirms correct manual focus. It sharpens to infinity. AV mode support. Exif metadata is fixed at 50mm f1.4 or 2.0.Both reductions fit Canon EOS 5D 7D 7D Mark II 20D 30D 40D 50D 60D 77D 80D 100D/Rebel SL1 200D/Rebel SL2 300D/Digital Rebel 350D/Digital Rebel XT 400D/Digital Rebel XTi 450D/Rebel XSi 500D/Rebel T1i 550D/ Rebel T2i 600D/Rebel T3i 650D/Rebel T4i 760D/Rebel T6s 800D/Rebel T7i 1000D/Rebel XS 1100D/Rebel T3 1200D/Rebel T5 1300D/Rebel T6), further Canon EOS R, RP, R5, R6 ...Reduction with canon chip DOES NOT WORK on: 6D, 6D Mark II, 70D, 5D Mark III, 5D Mark II, 650D, 750D, 700D (Rebel T5i)