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Black cylindrical medium-format macro lens with silver aperture ring and focus scale markings

PENTAX

PENTAX SMCP-FA 645 120mm f/4 Macro camera lens

SKU CH-R531-DECG0

Medium-format macro lens delivering 1:1 magnification at 120 mm with a versatile f/4–32 aperture range

  • 1:1 magnification at 15.4 in for detailed close-ups
  • 120 mm focal length gives 96 mm equivalent on 645D
  • f/4-32 aperture range for depth-of-field control
  • Built-in focus limiter speeds up autofocus response
  • 735 g weight balances durability with handling comfort

Ideal for medium format macro

The Pentax SMCP-FA 645 120mm f/4 Macro lens is built for medium format photographers who need life-size reproduction. It delivers a 1:1 magnification ratio at a minimum focus distance of 1.3 ft. The optic uses 9 elements in 7 groups with Super Multi Coating for high light transmission. It weighs 5.9 oz (735g) without the hood.

Upgrade from standard telephoto

This lens replaces a general-purpose short telephoto when 1:1 macro capability is required. The jump is worth it for product, nature or scientific work demanding full-frame detail at 120mm focal length. On the 645D it gives a 35mm equivalent of 96mm; on film 645 it acts like a 77mm lens. The aperture range runs from f/4 to f/32 for deep depth-of-field control.

Straightforward mount and focus

The lens mounts directly to the Pentax 645 bayonet with no adapter needed. A built-in focus limiter lets you preset the working distance range to speed up autofocus acquisition. An advanced floating mechanism and independently moving aperture mechanism maintain optical performance across the focus range. Ensure the camera body supplies autofocus drive, as the lens has no internal motor.

Highlights

  • 1:1 magnification at 15.4 in for detailed close-ups
  • 120 mm focal length gives 96 mm equivalent on 645D
  • f/4-32 aperture range for depth-of-field control
  • Built-in focus limiter speeds up autofocus response
  • 735 g weight balances durability with handling comfort

Specifications

No published specifications for this item yet.

Questions about this item

Does the 645-mount lens clear the mirror on a Pentax 645D body?

Yes, it is designed for the 645 system so the 645D mirror clears the rear element without an adapter.

How do I use the focus limiter to speed up autofocus?

Slide the limiter to match your working distance — near for macro or far for portraits — so the AF motor only hunts inside that range.

When should I replace the front element's super multi coating?

The SMC layer is permanent; clean it with a blower and microfibre cloth instead of planning a replacement.

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