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Black Pentax 43mm f/1.9 Limited lens, compact metal barrel, bayonet mount

PENTAX

PENTAX 20180 smc P-FA 43mm F1.9 Limited camera lens

SKU CH-4GMP-JYJF0 MPN 20180

A compact 43 mm f/1.9 standard lens with screw-drive autofocus, 53-degree angle of view and 1.5 ft minimum focus distance for Pentax K-mount film and digital SLRs

  • Diameter2.52 in (64 mm)
  • Focus systemAuto Focus
  • Lens focal length43 mm
  • Lens aperture1.9
  • Product typeStandard & Medium Telephoto Lens
  • Product colorBlack
  • Bright low-light shots from wide f/1.9 aperture
  • Natural perspective with 43mm standard focal length
  • Wide 53-degree angle of view fits more in frame
  • Close 1.5 ft focus for detailed near subjects
  • Light 155 g build carries easily all day

Pentax 43mm f/1.9 Limited standard lens

The Pentax smc P-FA 43mm F1.9 Limited is a compact standard lens for 35mm SLR bayonet mounts. Its 43mm focal length approximates the natural field of view, making it suited for everyday photography and portrait work on film or digital bodies.

Maximum aperture f/1.9 with 53-degree angle

The f/1.9 maximum aperture provides shallow depth of field and low-light capability across a 53-degree angle of view. The seven-element, six-group optical design uses the older SMC coating to reduce fringing in high-contrast scenes. A minimum aperture of 22 extends depth of field for stopped-down shooting.

58mm filter thread and screw-drive autofocus

The lens accepts 58mm filters and weighs 155 grams with a 64mm maximum diameter. Screw-drive autofocus delivers quick focusing with audible operation, a characteristic of its film-era design. Minimum focus distance is 1.5 feet for 0.12x magnification, limiting close-up work. Fully automatic diaphragm control simplifies exposure handling.

How it compares

Measured against everything we stock in Interchangeable Camera Lenses, at today’s prices. Recalculated every night.

Price $340.99
Cheaper than about 72% of the 2,570 comparable items (median $546.49).

Specifications

Product
Brand namePENTAX
Model nameSmc P-FA 43 mm F1.9 Limited
Product typeStandard & Medium Telephoto Lens
Product colorBlack
Audio & video
Focus systemAuto Focus
Lens focal length43 mm
Lens aperture1.9
Size & build
Diameter2.52 in (64 mm)
Product weight5.47 oz (155 g)
Shipping weight0.45 kg
Package size102 × 76 × 76 mm
Compatibility
Compatible withBayonet Mount 35 mm SLR

Questions about this item

How do I attach the Pentax 20180 to my K-mount body and what step is often missed?

Align the red dot on the bayonet mount with the camera index, twist until it clicks, then set the aperture ring to the A position so the camera can control the f/1.9 to f/22 range.

What maintenance will the screw-drive autofocus and SMC coating need over time?

The screw-drive gears may need re-lubrication if focusing becomes loud or hesitant; clean the front element with a blower and microfibre cloth to preserve the older SMC coating.

What limit appears first during extended handheld shooting at f/1.9?

The 155 g weight and 64 mm diameter keep fatigue low, but the 0.12× maximum magnification and 1.5 ft minimum focus distance restrict close-up work before handling becomes an issue.

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