Product Overview

Built for the Pentax 645D and 645Z, the Pentax D FA 645 55mm f/2.8 AL[IF] SDM AW is your go‑to standard prime when you want medium‑format punch without lugging a monster around. The 55mm focal length (43.5mm equivalent in 35mm terms) gives a natural field of view that’s spot‑on for everyday shooting – from wide‑open landscapes to environmental portraits. Wide open at f/2.8 it’s sharp, contrasty and controlled, with a hybrid aspherical design and advanced coatings working hard to keep flare, ghosting and aberrations in check, even in harsh Aussie light.

This lens is built to be used, not babied. The AW (All Weather) sealing and SP‑coated front element shrug off dust, spray and light rain, so you can keep shooting when the weather turns. The SDM autofocus is quick and quiet, while Quick‑Shift lets you grab the focus ring and fine‑tune instantly without hunting through menus. Rounded diaphragm blades deliver smooth, natural bokeh, and the compact, grippy barrel balances beautifully on the 645 bodies. If you want a tough, dependable standard lens that can live on your camera and handle just about anything in the field, this D FA 645 55mm f/2.8 is the one to bolt on and leave there.

Key Features

• 55mm standard focal length (43.5mm equivalent in 35mm format) delivers a natural angle of view, ideal for everyday shooting, landscapes and portraits.
• Bright f/2.8 maximum aperture allows faster shutter speeds and smoother background blur, helping you shoot confidently in low light.
• Weather-resistant, dust-proof AW construction with multiple seals enhances reliability when shooting in rain, mist or dusty outdoor environments.
• Supersonic Direct-drive Motor (SDM) autofocus provides smooth, quiet focusing, which is especially useful for candid work and video capture.
• Quick-Shift Focus system lets you instantly fine-tune focus manually after AF locks, giving precise control over critical focus points.
• Aero Bright and smc lens coatings minimise flare and ghosting, improving contrast and clarity when shooting backlit scenes.
• Hybrid aspherical optical elements and advanced 9-blade rounded diaphragm produce sharp images with attractive, natural-looking bokeh.
• Internal focusing (AL[IF]) design keeps the lens length constant during focusing, improving handling and balance on medium-format bodies.
• Close focusing down to 0.5 m with 0.17x magnification enables detailed close-up shots without changing lenses.
• Lightweight, compact medium-format design (approx. 416 g) makes it an easy-to-carry standard prime for 645D and 645Z systems.