Compare Pentax-DA 20-40mm F2.8-4 vs Pentax-D FA* 85mm F1.4 vs Pentax-D FA* 70-200mm F2.8
Construction
Aperture Blades
9 blades, Rounded aperture
9 blades
9 blades, Rounded (f/2.8-5.6)
Colors
Black, silver
Black
Black or Silver
Form Factor
Standard Zoom Lens
Short Telephoto Prime Lens
Telephoto Zoom Lens
Image Size
APS-C
Full-Frame
Full-Frame
Lens Barrel
Distance scale, DoF scale
Distance scale
Focus limiter, Tripod collar, Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Motor
Micromotor
Ring-type ultrasonic
Optical Formula | Elements
9 elements
12 elements
19 elements
Optical Formula | Groups
8 groups
10 groups
16 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
1 aspherical + 3 Super ED elements, HD coating groups
HD, AB, Super Protect coatings groups
Dimensions
Filter Diameter
55 mm / 2.17 in
82 mm / 3.23 in
77 mm / 3.03 in
Size | Diameter
71 mm / 2.80 in
95 mm / 3.74 in
92 mm / 3.62 in
Size | Length
69 mm / 2.72 in
124 mm / 4.88 in
203 mm / 7.99 in
Weight
283 g / 10.00 oz
1255 g / 44.35 oz
1755 g / 62.01 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)
28.6° Diagonal | 23.9° Horizontal | 16.1° Vertical
34.4° Diagonal | 28.8° Horizontal | 19.5° Vertical (wide) ~ 12.4° Diagonal | 10.3° Horizontal | 6.9° Vertical (tele)
Aperture
f/2.8–4 ~ f/22–32
f/1.4 ~ f/16
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
Focal Length
20 mm ~ 40 mm
85 mm
70 mm ~ 200 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Yes
Zoom Type
External zoom
External zoom (zoom lock available)
Performance
Max Magnification
0.2x
0.12x
0.13x
Min Focus Distance
280 mm / 11.02 in
850 mm / 33.46 in
1200 mm / 47.24 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens hood included
Lens Hood: PH-RBM77 (supplied)
Debut
2013-11-06
2020-05-27
2015-02-04
Reviews
Neofiliac score
50%
68%
40%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Bright maximum aperture
- Weather-sealed
- Premium design and construction
- Superb image quality
- Zoom lock prevents zoom creep
- Weather-sealed
- Comes with a tripod collar
- Very nice construction
- Well priced
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Large diameter
- On the heavy side
- Large and heavy
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