Compare Pentax-D FA 21mm F2.4ED vs PENTAX-D FA 15-30mm F2.8 vs Pentax-D FA 24-70mm F2.8
Construction
Aperture Blades
8 blades, Rounded diaphragm
9 blades
9 blades
Colors
Black, Silver
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Zoom Lens
Standard Zoom Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Distance scale, DoF scale
Distance scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminum
Motor
Ultrasonic
Ultrasonic
Optical Formula | Elements
11 elements
18 elements
17 elements
Optical Formula | Groups
8 groups
13 groups
12 groups
Optical Formula | Special Glass
4 ED elements, 1 Super ED element groups
Three ED and aspherical elements + HD and SP coatings groups
Three ED + four aspherical elements + HD Coating groups
Dimensions
Filter Diameter
67 mm / 2.64 in
82 mm / 3.23 in
Size | Diameter
74 mm / 2.91 in
99 mm / 3.90 in
89 mm / 3.50 in
Size | Length
89 mm / 3.50 in
144 mm / 5.67 in
110 mm / 4.33 in
Weight
416 g / 14.70 oz
1040 g / 36.75 oz
787 g / 27.81 oz
Function
Angle Of View
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
110.6° Diagonal | 100.4° Horizontal | 77.3° Vertical (wide) ~ 71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (tele)
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 34.4° Diagonal | 28.8° Horizontal | 19.5° Vertical (tele)
Aperture
f/2.4–22 ~ f/2.4–22
f/2.8 ~ f/22
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Focal Length
21 mm
15 mm ~ 30 mm
24 mm ~ 70 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Yes
Performance
Max Magnification
0.26x
0.2x
0.2x
Min Focus Distance
180 mm / 7.09 in
280 mm / 11.02 in
380 mm / 14.96 in
Production
Accessory
Lens hood included
Lens hood included
Lens Hood: PH-RBD82 (supplied)
Debut
2021-10-21
2016-02-17
2015-09-24
Reviews
Neofiliac score
76%
31%
59%
Pros
- Weather-sealed
- Great image quality
- 8-bladed aperture for sunstars
- Constant f/2.8 aperture
- Great optical performance
- Weather-sealed
- Beautifully constructed
- Weather-sealed
- Good autofocus performance
- Well priced for f/2.8 standard zoom
Cons
- Rather long
- On the heavy side
- Lacks front filter thread
- Not as well built as newer Pentax lenses
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