Pentax SMC Pentax 645 75mm f/2.8

SMC Pentax 645 75mm f/2.8 is the standard normal lens for the Pentax 645 system — equivalent to roughly a 47mm field of view in 35mm terms on the 6×4.5 cm format. The 75mm focal length is true normal for 645 (matching the diagonal of the frame), and most Pentax 645 buyers receive this lens as their kit standard.

Key features

• Pentax 645 bayonet mount — fits Pentax 645, 645N, 645NII, and 645D/645Z digital bodies
• 6-element/5-group double-Gauss formula with SMC multi-coating
• 67mm filter thread
• Manual aperture + autofocus on 645N+ (manual on original 645)
• Focal-plane-shutter operation — speed set on body
• A-series electrical-aperture interface — works with 645N+ AE modes

Use case + rendering

The 75mm f/2.8 is the universal Pentax 645 portrait + general lens. Wide-open performance is good; stopped to f/4-f/5.6 it is sharp across the field. SMC multi-coating gives clean color rendering and good flare control.

The 645 system shoots 16 frames per 120 roll, which makes it the most film-economical medium format. Pentax 645 bodies (especially 645N) auto-advance the film and provide AE prism finder integration — the closest experience to a 35mm SLR available in medium format.

Compatible bodies

• Pentax 645 — manual focus only
• Pentax 645N — autofocus + AE
• Pentax 645 NII — autofocus + AE refinement

Related lenses

• SMC Pentax 645 45mm f/2.8 — wide alternative
• SMC Pentax 645 150mm f/3.5 — short telephoto
• SMC Pentax 645 200mm f/4 — telephoto