Compare Pentax-D FA 21mm F2.4ED vs Pentax-DA 20-40mm F2.8-4 vs Pentax-DA 11-18mm F2.8
Construction
Aperture Blades
8 blades, Rounded diaphragm
9 blades, Rounded aperture
Colors
Black, Silver
Black, silver
Form Factor
Ultra Wide-Angle Prime Lens
Standard Zoom Lens
Ultra Wide-Angle Zoom Lens
Image Size
Full-Frame
APS-C
APS-C
Lens Barrel
Distance scale, DoF scale
Distance scale, DoF scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminum
Aluminium barrel
Motor
Micromotor
Optical Formula | Elements
11 elements
9 elements
Optical Formula | Groups
8 groups
8 groups
Optical Formula | Special Glass
4 ED elements, 1 Super ED element groups
1 ED glass element, 1 SLD glass element, HD coating groups
Dimensions
Filter Diameter
67 mm / 2.64 in
55 mm / 2.17 in
Size | Diameter
74 mm / 2.91 in
71 mm / 2.80 in
Size | Length
89 mm / 3.50 in
69 mm / 2.72 in
Weight
416 g / 14.70 oz
283 g / 10.00 oz
Function
Angle Of View
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (wide) ~ 39.7° Diagonal | 33.4° Horizontal | 22.6° Vertical (tele)
105.4° Diagonal | 95.0° Horizontal | 72.1° Vertical (wide) ~ 77.4° Diagonal | 67.4° Horizontal | 47.9° Vertical (tele)
Aperture
f/2.4–22 ~ f/2.4–22
f/2.8–4 ~ f/22–32
f/2.8
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
21 mm
20 mm ~ 40 mm
11 mm ~ 18 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
16.5 mm ~ 27.0 mm
Focus Type
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.26x
0.2x
Min Focus Distance
180 mm / 7.09 in
280 mm / 11.02 in
Production
Accessory
Lens hood included
Lens Hood: MH-RA55 (supplied)
Lens hood included
Debut
2021-10-21
2013-11-06
2017-10-26
Reviews
Neofiliac score
76%
50%
40%
Pros
- Weather-sealed
- Great image quality
- 8-bladed aperture for sunstars
- Weather-sealed
- Beautiful construction for manual focusing
- Good build quality
- Good center resolution
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Lacks front filter thread
- Expensive for an APS-C wide-angle zoom
Remove
Remove
Remove
Add up to 4 products to the comparison using the search bar above
Information on this page is provided on an as-is basis. No warranty on accuracy is implied. This page may contain affiliate links to third-party merchants such as Amazon and eBay. If you make a purchase using the supplied link, we may receive a commission. Neofiliac places the utmost respect for your privacy. We use no cookie whatsoever beyond that needed for the proper functioning of the website.