Compare Sigma 50-100mm F1.8 DC HSM vs Pentax-D FA 70-210mm F4 vs Pentax DA 40mm F2.8
Construction
Aperture Blades
9 blades, Rounded blades
9 blades
9 blades, Rounded aperture diaphragm
Colors
Black
Black
Black, Silver
Form Factor
Telephoto Zoom Lens
Super Telephoto Zoom Lens
Short Telephoto Prime Lens
Image Size
APS-C
APS-C
APS-C
Lens Barrel
Focus limiter, Distance scale
Distance scale
Lens Mount
Canon EF-mount, Nikon F-mount, Sigma SA-mount
Pentax K-mount
Pentax K-mount
Material
Magnesium alloy
Motor
Ring-type ultrasonic
Screw drive from camera
Optical Formula | Elements
21 elements
20 elements
5 elements
Optical Formula | Groups
15 groups
14 groups
4 groups
Optical Formula | Special Glass
Three FLD, one SLD, one HRI elements groups
2 anomalous dispersion and 3 ED elements + HD coating groups
High-grade multi-layer HD (High Definition) Coating groups
Dimensions
Filter Diameter
82 mm / 3.23 in
67 mm / 2.64 in
49 mm / 1.93 in
Size | Diameter
94 mm / 3.70 in
79 mm / 3.11 in
63 mm / 2.48 in
Size | Length
171 mm / 6.73 in
175 mm / 6.89 in
15 mm / 0.59 in
Weight
1490 g / 52.65 oz
819 g / 28.94 oz
80 g / 2.83 oz
Function
Angle Of View
32.2° Diagonal | 27.0° Horizontal | 18.2° Vertical (wide) ~ 16.4° Diagonal | 13.7° Horizontal | 9.1° Vertical (tele)
23.3° Diagonal | 19.5° Horizontal | 13.0° Vertical (wide) ~ 7.9° Diagonal | 6.5° Horizontal | 4.4° Vertical (tele)
39.7° Diagonal | 33.4° Horizontal | 22.6° Vertical
Aperture
f/1.8 ~ f/16
f/4 ~ f/32
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
1.5
Focal Length
50 mm ~ 100 mm
70 mm ~ 210 mm
40 mm
Focal Length (35mm Equivalent)
75.0 mm ~ 150.0 mm
105.0 mm ~ 315.0 mm
60.0 mm
Focus Type
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Yes
Zoom Type
Internal zoom
Internal zoom
Performance
Max Magnification
0.15x
0.32x
0.13x
Min Focus Distance
950 mm / 37.40 in
950 mm / 37.40 in
400 mm / 15.75 in
Production
Accessory
Lens hood included
Lens hood included
Lens Hood: MH-RE49 (supplied)
Debut
2016-02-23
2020-01-22
2013-08-27
Made In
Japan
Reviews
Neofiliac score
46%
31%
68%
Pros
- Superb image quality
- Internal zoom
- Weather-sealed
- Beautifully built
- Very useful focal range
- Exceptionally light and compact
- Great rendering
Cons
- Very large and heavy for an APS-C lens
- Lacks weather sealing
- Dark maximum aperture
- A bit expensive for a pancake lens
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