Compare Olympus 17mm F1.8 vs Samyang 7.5mm F3.5 UMC Fisheye vs Olympus 8mm F1.8 Fisheye PRO
Construction
Aperture Blades
7 blades, Circular aperture diaphragm
7 blades, Circular
Colors
Silver, black
Black
Form Factor
Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
MFT
MFT
MFT
Lens Barrel
Distance scale, DoF scale
Physical aperture ring, Distance scale
Lens Mount
Micro Four Thirds-mount
Micro Four Thirds-mount
Micro Four Thirds-mount
Motor
Micromotor
Stepper motor
Optical Formula | Elements
9 elements
9 elements
17 elements
Optical Formula | Groups
6 groups
7 groups
15 groups
Optical Formula | Special Glass
2 Aspherical, HR glass element groups
1 aspherical, 3 super ED, 2 ED, 1 super HR, 2 HR lenses groups
Dimensions
Filter Diameter
46 mm / 1.81 in
Size | Diameter
58 mm / 2.28 in
60 mm / 2.36 in
62 mm / 2.44 in
Size | Length
36 mm / 1.42 in
48 mm / 1.89 in
80 mm / 3.15 in
Weight
120 g / 4.24 oz
197 g / 6.96 oz
314 g / 11.10 oz
Function
Angle Of View
65.0° Diagonal | 55.8° Horizontal | 38.9° Vertical
180° Diagonal (fisheye)
180° Diagonal (fisheye)
Aperture
f/1.8 ~ f/22
f/3.5 ~ f/22
f/1.8 ~ f/22
Autofocus
Yes
No
Yes
Crop Factor
2.0
2.0
2.0
Focal Length
17 mm
7.5 mm
8 mm
Focal Length (35mm Equivalent)
34.0 mm
15.0 mm
16.0 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Yes
Performance
Max Magnification
0.08x
0.2x
Min Focus Distance
250 mm / 9.84 in
90 mm / 3.54 in
120 mm / 4.72 in
Production
Accessory
Lens Hood: Built-in petal-type hood (supplied)
Lens hood included
Debut
2012-06-15
2011-09-05
2015-05-12
Reviews
Neofiliac score
76%
50%
67%
Pros
- Compact and lightweight
- Good IQ stopped down
- Very light and compact
- 180° FOV
- 180° FOV
- Weather-sealed
- Beautifully constructed
Cons
- Low maximum magnification
- Expensive for what it is
- Lacks front filter thread
- Lacks weather sealing
- Priced higher than full-frame fisheyes
- Lacks front filter thread
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