Compare Pentax-DA 20-40mm F2.8-4 vs Pentax-D FA 150-450mm F4.5-5.6 vs Pentax DA 40mm F2.8
Construction
Aperture Blades
9 blades, Rounded aperture
9 blades, Rounded (150mm: F4.5-8, 450mm: F5.6-8)
9 blades, Rounded aperture diaphragm
Colors
Black, silver
Black
Black, Silver
Form Factor
Standard Zoom Lens
Super Telephoto Zoom Lens
Short Telephoto Prime Lens
Image Size
APS-C
Full-Frame
APS-C
Lens Barrel
Distance scale, DoF scale
Focus limiter, Tripod collar, Distance scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminium barrel
Motor
Micromotor
Micromotor
Screw drive from camera
Optical Formula | Elements
9 elements
18 elements
5 elements
Optical Formula | Groups
8 groups
14 groups
4 groups
Optical Formula | Special Glass
1 ED glass element, 1 SLD glass element, HD coating groups
HD, Super protect coatings, ED elements groups
High-grade multi-layer HD (High Definition) Coating groups
Dimensions
Filter Diameter
55 mm / 2.17 in
86 mm / 3.39 in
49 mm / 1.93 in
Size | Diameter
71 mm / 2.80 in
95 mm / 3.74 in
63 mm / 2.48 in
Size | Length
69 mm / 2.72 in
242 mm / 9.53 in
15 mm / 0.59 in
Weight
283 g / 10.00 oz
2000 g / 70.67 oz
80 g / 2.83 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)
16.4° Diagonal | 13.7° Horizontal | 9.1° Vertical (wide) ~ 5.5° Diagonal | 4.6° Horizontal | 3.1° Vertical (tele)
39.7° Diagonal | 33.4° Horizontal | 22.6° Vertical
Aperture
f/2.8–4 ~ f/22–32
f/4.5–5.6 ~ f/22–27
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
20 mm ~ 40 mm
150 mm ~ 450 mm
40 mm
Focal Length (35mm Equivalent)
30.0 mm ~ 60.0 mm
60.0 mm
Focus Type
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Zoom Type
External zoom
External zoom (zoom lock available)
Performance
Max Magnification
0.2x
0.22x
0.13x
Min Focus Distance
280 mm / 11.02 in
2000 mm / 78.74 in
400 mm / 15.75 in
Production
Accessory
Lens Hood: MH-RA55 (supplied)
Lens Hood: PH-RBA86 (supplied), Tripod mount: O-TM80Lens case: HS120-270
Lens Hood: MH-RE49 (supplied)
Debut
2013-11-06
2015-02-04
2013-08-27
Reviews
Neofiliac score
50%
31%
68%
Pros
- Weather-sealed
- Beautiful construction for manual focusing
- Great reach at a reasonable price point
- Zoom lock prevents zoom creep
- Weather-sealed
- Comes with a tripod collar
- Exceptionally light and compact
- Great rendering
Cons
- External zoom without zoom lock
- Not the most interesting focal range
- Dark maximum aperture
- Large and heavy
- A bit expensive for a pancake lens
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