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
B h photo.32817553
21 March 2016

I am a hobbyist, not a professional. I fumble, puzzle, scratch my head and occasionally stumble backward into taking a decent photo. I enjoy the process. As comparison is the thief of joy, I will not (nor can I) wage this lens against another brand's macro lens. I bought it. I'm happy with it.

B h photo.32817553
4 weeks ago

One of the first three lenses I purchased with my new K-1 and while I have had it only a short time, my first outing with it exceeded my expectations for clarity and speed. Combined with the light weight water-resitant construction, I expect this to remain a go-to lens for years to come.

B h photo.32817553
27 April 2017

Pro-quality, weather resistant macro lens that's great for APS-C or full frame. It's a 150mm macro on my K-3 and 100mm on my K-1. Light weight; great for hiking. Lowest priced of all brands. This lens cannot be beat.

B h photo.32817553
26 April 2017

I am having a lot of fun with this lens. Using it with a K3, I am able to get decent photos of insects in the field under challenging conditions - wind, fast moving insects, and low light (I do use a light ring).

B h photo.32817553
6 March 2017

Amazing Macro lens. Extremely satisfied with speed and results.

B h photo.32817553
17 February 2017

While I love macro photography, I bought this primarily for portraiture. I'm very pleased! It's a beautiful lens and is very sharp. Yes, the auto-focus motor is loud; but in situations where the noise would become an issue, I just pop it on manual focus. I'm very happy with this purchase!

B h photo.32817553
12 January 2017

Real nice lens for portrait, very sharp! Macro is great for flowers and butterfly's. all in all excellent lens!

B h photo.32817553
22 November 2016

Amazing Macro lens. Extremely satisfied with speed and results.

B h photo.32817553
6 October 2016

Looking forward to using this for its macro applications.

B h photo.32817553
6 August 2016

Awesome! Even for a novice like myself!

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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