Pentax smc Pentax-D FA 100mm f/2.8 WR Macro Lens

Model #21910

USA Version
Pentax 21910 1
Pentax 21910 1
Pentax 21910 3
Pentax 21910 2
Pentax 21910 4
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Dimensions (dxl) Approx. 3.2 x 2.5" (8.13 x 6.35 cm)
Weight 12 oz (340 g)
Filter thread 49 mm


Camera mount type Pentax K
Groups/elements 8/9
Angle of view 24.5°
APS-C Picture Angle: 16°
Diaphragm blades 8
Format compatibility 35mm Film / Full-Frame Digital Sensor
Pentax Digital (APS-C)
Minimum focus distance 11.81" (30.00 cm)
Magnification 1x
Focal length 100 mm
Comparable APS-C Focal Length: 153 mm
Aperture Maximum: f/2.8
Minimum: f/32
Maximum reproduction ratio 1:1


Image stabilization No
Tripod collar No
Autofocus Yes
Expert Reviews
6 July 2014

This macro optic provides an angle of view equivalent to a 150mm on a 35mm format camera, when mounted on a Pentax Digital SLR. It sports a fast f/2.8 maximum aperture, life size magnification at its closest focusing distance, weather resistant construction and costs around £515.

27 August 2011

The image quality of this lens is superb and the lens is very well made: it really feels and handles like a precision instrument. It is weather-sealed and can be used in adverse weather and perhaps more importantly, in environments with dust and pollen without any worry about getting dust on the...

User Reviews
30 April 2016

I've only just received this, but have been testing it out most of the day. Excellent, sharp images. Very shallow depth of field at large apertures and close up. Just what is needed in a macro lens.

  • +

    Consistent Output, Easily Interchangeable, Lightweight, Rugged, Sharp Focus, Strong Construction

16 March 2011

I am very pleased indeed with this lens. It provides consistantly high quality images. My prime use is flowers and insects. It also makes a good portrait lens as well but I rarely use it for that. It has survived a trek in the tropical rain forest with not problems and good results

  • +

    Consistent Output, Durable, Easily Interchangeable, Lightweight, Quick Focus, Sharp Focus

8 April 2010

Easy to focus and finetune with the focus ring but sometimes hunts, but less so now I'm used to it. Pin sharp macro work and good depth of field. Camera usually set at 100 ISO and lens is fine even in dull light.

  • +

    Consistent Output, Durable, Easily Interchangeable, Quick Focus, Rugged, Sharp Focus, Strong Construction

Product Highlights
  • Tele-Macro Lens
  • Weather Resistant (WR) with 6 Seals
  • 1:1 Magnification
  • Outstanding Depth of Field Control
  • Super Protect Lens Coating
  • Aluminum Housing
Average Expert Score
Average User Score
In The Box
  • Pentax smc Pentax-D FA 100mm f/2.8 WR Macro Lens
  • PH-RBB Lens Hood
  • Lens Case S80-120 (Soft)
  • 49mm Snap-On Lens Cap
  • Rear Lens Cap (B) for Bayonet Mount Lenses
  • 1-Year Manufacturer's Warranty
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