Mamiya's telephoto for the E/NC system — the Sekor E 135mm f/3.5 for Mamiya SLRs.
The Mamiya Sekor E 135mm f/3.5 is a telephoto prime for Mamiya's E-mount (NC mount) SLR system. Mamiya Sekor lenses are well-regarded for optical quality. At 135mm f/3.5, it provides classic telephoto portrait perspective. The Sekor designation ensures good optics within the proprietary Mamiya mount.
Optical performance is good — Mamiya Sekor quality applies. Sharpness is respectable from f/3.5. The 135mm provides useful portrait compression. Mamiya's multi-coating ensures good contrast. The Sekor reputation is deserved — these are quality optics limited by the proprietary mount rather than optical capability.
Mamiya NC mount — proprietary and discontinued. Filter thread varies. Weight varies. Build quality is good Mamiya Sekor. Manual focus. The proprietary mount severely limits compatibility. Adapters to other systems are uncommon. The Sekor quality is wasted on the limited mount system.
Very cheap. Check focus and optics. Good Mamiya Sekor quality trapped in a proprietary mount. Only for Mamiya NC system owners. The Sekor optical quality deserves a more widely compatible mount. Not adaptable to modern systems without rare adapters.