Compare Pentax-DA 20-40mm F2.8-4 vs Pentax-D FA 24-70mm F2.8
Construction
Aperture Blades
9 blades, Rounded aperture
9 blades
Colors
Black, silver
Black
Form Factor
Standard Zoom Lens
Standard Zoom Lens
Image Size
APS-C
Full-Frame
Lens Barrel
Distance scale, DoF scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Motor
Micromotor
Ultrasonic
Optical Formula | Elements
9 elements
17 elements
Optical Formula | Groups
8 groups
12 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
Three ED + four aspherical elements + HD Coating groups
Dimensions
Filter Diameter
55 mm / 2.17 in
82 mm / 3.23 in
Size | Diameter
71 mm / 2.80 in
89 mm / 3.50 in
Size | Length
69 mm / 2.72 in
110 mm / 4.33 in
Weight
283 g / 10.00 oz
787 g / 27.81 oz
Function
Angle Of View
71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (wide) ~ 39.7° Diagonal | 33.4° Horizontal | 22.6° Vertical (tele)
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 34.4° Diagonal | 28.8° Horizontal | 19.5° Vertical (tele)
Aperture
f/2.8–4 ~ f/22–32
f/2.8 ~ f/22
Autofocus
Yes
Yes
Crop Factor
1.5
Focal Length
20 mm ~ 40 mm
24 mm ~ 70 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
Focus Type
Internal
Image Stabilization
No
No
Weather Resistance
Yes
Yes
Zoom Type
External zoom
Performance
Max Magnification
0.2x
0.2x
Min Focus Distance
280 mm / 11.02 in
380 mm / 14.96 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens Hood: PH-RBD82 (supplied)
Debut
2013-11-06
2015-09-24
Reviews
Neofiliac score
50%
59%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Good autofocus performance
- Well priced for f/2.8 standard zoom
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Not as well built as newer Pentax lenses
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