Compare Pentax-D FA 70-210mm F4 vs Pentax-DA 20-40mm F2.8-4 vs Pentax-D FA 70-210mm F4
Construction
Aperture Blades
9 blades
9 blades, Rounded aperture
9 blades
Colors
Black
Black, silver
Black
Form Factor
Super Telephoto Zoom Lens
Standard Zoom Lens
Super Telephoto Zoom Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Focus limiter, Distance scale
Distance scale, DoF scale
Focus limiter, Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Magnesium alloy
Aluminium barrel
Magnesium alloy
Motor
Ring-type ultrasonic
Micromotor
Ring-type ultrasonic
Optical Formula | Elements
20 elements
9 elements
20 elements
Optical Formula | Groups
14 groups
8 groups
14 groups
Optical Formula | Special Glass
2 anomalous dispersion and 3 ED elements + HD coating groups
1 ED glass element, 1 SLD glass element, HD coating groups
2 anomalous dispersion and 3 ED elements + HD coating groups
Dimensions
Filter Diameter
67 mm / 2.64 in
55 mm / 2.17 in
67 mm / 2.64 in
Size | Diameter
79 mm / 3.11 in
71 mm / 2.80 in
79 mm / 3.11 in
Size | Length
175 mm / 6.89 in
69 mm / 2.72 in
175 mm / 6.89 in
Weight
819 g / 28.94 oz
283 g / 10.00 oz
819 g / 28.94 oz
Function
Angle Of View
23.3° Diagonal | 19.5° Horizontal | 13.0° Vertical (wide) ~ 7.9° Diagonal | 6.5° Horizontal | 4.4° Vertical (tele)
71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (wide) ~ 39.7° Diagonal | 33.4° Horizontal | 22.6° Vertical (tele)
23.3° Diagonal | 19.5° Horizontal | 13.0° Vertical (wide) ~ 7.9° Diagonal | 6.5° Horizontal | 4.4° Vertical (tele)
Aperture
f/4 ~ f/32
f/2.8–4 ~ f/22–32
f/4 ~ f/32
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
70 mm ~ 210 mm
20 mm ~ 40 mm
70 mm ~ 210 mm
Focal Length (35mm Equivalent)
105.0 mm ~ 315.0 mm
30.0 mm ~ 60.0 mm
105.0 mm ~ 315.0 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Yes
Zoom Type
Internal zoom
External zoom
Internal zoom
Performance
Max Magnification
0.32x
0.2x
0.32x
Min Focus Distance
950 mm / 37.40 in
280 mm / 11.02 in
950 mm / 37.40 in
Production
Accessory
Lens hood included
Lens Hood: MH-RA55 (supplied)
Lens hood included
Debut
2020-01-22
2013-11-06
2020-01-22
Reviews
Neofiliac score
31%
50%
31%
Pros
- Weather-sealed
- Beautifully built
- Very useful focal range
- Weather-sealed
- Beautiful construction for manual focusing
- Weather-sealed
- Beautifully built
- Very useful focal range
Cons
- Dark maximum aperture
- External zoom without zoom lock
- Not the most interesting focal range
- Dark maximum aperture
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