Pentax 45-85mm f/4.5 smc PENTAX-FA 645 ZOOM Autofocus Lens for Pentax 645N, Black Review

The Pentax 45-85mm f/4.5 smc FA 645 is a compact mid-range zoom designed for the 645N medium format system. Covering a moderate wide to short telephoto range equivalent to roughly 28-53mm in full-frame terms, it offers versatility for landscape, documentary, and portrait work within the 645 ecosystem. The constant f/4.5 aperture keeps the lens relatively lightweight and affordable, though it sacrifices speed compared to faster primes.

Build quality follows Pentax's smc FA 645 standard, with multi-coating to reduce flare and solid mechanical construction. Autofocus is supported on compatible bodies like the 645N and 645NII. The 77mm filter thread is standard for the system, making it easy to share filters across other 645 glass. At the listed price point, this is a used bargain-grade example from KEH, meaning it will show wear and cosmetic blemishes but remain fully functional. For shooters building out a 645 kit on a budget or needing a walkaround zoom for medium format, it fills a practical niche without demanding the investment of premium glass.