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Black metal-bodied 50mm macro lens with silver focus ring and KAF mount

PENTAX

PENTAX 21530 smc P-D FA 50mm F2.8 camera lens

SKU CH-FTS8-XNWJ1 MPN 21530

A 50 mm macro lens for Pentax KAF cameras with 1:1 magnification, f/2.8 aperture and Quick-Shift Focus

  • TypeFixed Length Lens
  • ColorBlack
  • Diameter2.70 " (68.5 mm)
  • CompatibilityPENTAX KAF Mount 35mm Digital and 35mm Film SLRs
  • Focus TypeAuto Focus
  • Focal Length50 mm
  • 1:1 macro magnification captures life-size detail
  • F2.8 maximum aperture enables shallow depth of field
  • Quick-Shift Focus System allows instant AF to MF switching
  • 265 g lightweight design suits handheld macro work
  • KAF mount fits 35 mm digital and film SLRs

PENTAX 50mm F2.8 Macro Lens

The PENTAX smc P-D FA 50mm F2.8 is a fixed focal length lens designed for macro photography at 1x magnification. It mounts on PENTAX KAF mount 35mm digital and film SLR bodies and covers a 47 degree angle of view on full-frame formats. The lens construction uses 8 elements in 7 groups with an 8-blade diaphragm stopping down to F32. Its Quick-Shift Focus System allows instant switching between auto and manual focus without changing camera settings.

Thermals Noise Power

This is a passive optical lens with no electronic cooling, fans, or power draw. It produces no operational noise during focusing or aperture changes. The aperture ring provides tactile control over exposure without relying on camera body motors. Heat buildup is not a factor in normal photographic use because there are no active components to generate it.

Build Quality Mounting

The lens features a robust metal lens mount for secure attachment to KAF-compatible bodies. A large lens hood is included to reduce flare and ghosting by blocking stray light. The compact barrel measures 68.5 mm in diameter and weighs 265 g, making it easy to carry for field work. The aperture ring and focus ring operate smoothly for precise manual adjustments when needed.

Highlights

  • 1:1 macro magnification captures life-size detail
  • F2.8 maximum aperture enables shallow depth of field
  • Quick-Shift Focus System allows instant AF to MF switching
  • 265 g lightweight design suits handheld macro work
  • KAF mount fits 35 mm digital and film SLRs

Specifications

BrandPENTAX
Modelsmc P-D FA 50mm F2.8
TypeFixed Length Lens
ColorBlack
Diameter2.70 " (68.5 mm)
CompatibilityPENTAX KAF Mount 35mm Digital and 35mm Film SLRs
Focus TypeAuto Focus
Focal Length50 mm
Aperture2.8
SpecificationsMount: PENTAX KAF
Lens Construction: 8 elements in 7 groups
Angle Of View: 47 degrees (31.5o with *ist D body)
Diaphragm: Fully automatic
Blades: 8
Min Aperture: F32
Metering: TTL open-aperture metering
Min Focus Distance: 7.67 inches (0.195m)1.85 inches (0.047m)
Max Magnification: Life size (1X)
Filter Diameter: 49mm
Size Max Diameter Length: 2.7 inches (67.5mm)
Weight: 9.3 oz. (265g)
Weight9.34 oz(265 g)
Shipping weight0.45 kg
Package size102 × 102 × 102 mm

Questions about this item

How do I mount the 21530 lens on my Pentax KAF body and what step is often missed?

Align the red dot on the lens barrel with the mount index, twist clockwise until it clicks, then set the aperture ring to the "A" position so the camera can control the f-stop electronically.

What part of the 21530 will need replacement after heavy use?

The eight-blade diaphragm mechanism and the AF drive gears are the wear items; the metal KAF mount itself is durable but the electrical contacts can oxidise over time.

At what magnification does the 21530 reach its optical limit in extended macro sessions?

At 1× magnification the lens operates at its design limit; diffraction becomes visible beyond f/32 and the 47° angle of view narrows to 31.5° on APS-C bodies.

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