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Samyang 20mm F1.8 ED AS UMC vs Sigma 20mm F1.8 EX DG Aspherical RF

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Samyang 20mm F1.8

Wideangle Prime | Canon EF

Samyang 20mm F1.8 ED AS UMC
CHECK PRICE

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Sigma 20mm F1.8 EX DG RF

Wideangle Prime | Canon EF

Sigma 20mm F1.8 EX DG Aspherical RF
CHECK PRICE

BUY from B&H PHOTO

Samyang 20mm F1.8 vs Sigma 20mm F1.8 EX DG RF Comparison Overview

In this review, we will be comparing Samyang 20mm F1.8 and Sigma 20mm F1.8 EX DG RF, two Wideangle Prime lenses from Samyang and Sigma. Both lenses have the same focal length and max apertures of 20mm focal range and a max aperture of F1.8 so they are very comparable in this regard.

We will start with briefly looking and the main specs of these two lenses and in the section, we will start analyzing in more detail and list the pros and cons of each lenses.

Samyang 20mm F1.8 Key Specs

  • 20mm Focal Range
  • F1.8 Max Aperture
  • Filter Thread: 77mm
  • Max Format: 35mm FF
  • Canon EF Mount
  • Weight: 497g.
  • Diameter: 83mm
  • Length: 88mm
  • Min Focus Distance:0.2m

Sigma 20mm F1.8 EX DG RF Key Specs

  • 20mm Focal Range
  • F1.8 Max Aperture
  • Filter Thread: 82mm
  • Max Format: 35mm FF
  • Canon EF Mount
  • Weight: 520g.
  • Diameter: 89mm
  • Length: 90mm
  • Min Focus Distance:0.2m

What type of photography are the Samyang 20mm F1.8 and Sigma 20mm F1.8 EX DG RF lenses good for?

The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 20mm F1.8 and the Sigma 20mm F1.8 EX DG RF for their suitability to various photography scenarios:

Photography Type Samyang 20mm F1.8 Sigma 20mm F1.8 EX DG RF
Bird/WildlifePoorPoor
SportsPoorPoor
PortraitFairFair
TravelAverageAverage
StreetExcellentExcellent
WeddingFairFair
Walk AroundAverageAverage
VloggingVery GoodVery Good
LandscapeGoodGood

Size and Weight Comparison

Size of a lens is an important deciding factor when comparing two lenses.Sigma 20mm F1.8 EX DG RF is the longer of the two lenses at 90mm. The Samyang 20mm F1.8 with a length of 88mm is 2mm shorter. Besides being longer, the Sigma 20mm F1.8 EX DG RF also has a larger diameter of 89mm compared to Samyang 20mm F1.8's 83mm diameter.

Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Samyang 20mm F1.8 weighs 497g, which means it is 23g (4%) lighter than the Sigma 20mm F1.8 EX DG RF which has a weight of 520g.


Below you can find the dimension and weight table of the 'Wideangle Prime Lenses in Canon EF Mount for size comparison purposes.

Wideangle Prime Lenses in Canon EF Mount for Size Comparison
Model Length Diameter Weight Street Price
Canon EF 35mm f2 IS USM Lens Canon 35mm f2 IS USM
63mm
78mm 335g Amazon B&H Photo
Canon EF 28mm f2.8 Lens Canon 28mm f2.8
43mm
67mm 185g Amazon B&H Photo
Samyang MF 14mm F2.8 Mk2 Lens Samyang MF 14mm F2.8 Mk2
96mm
87mm 649g Amazon B&H Photo
Tamron SP 35mm F1.4 Di USD Lens Tamron SP 35mm F1.4 Di USD
mm
mm 805g Amazon B&H Photo
Rokinon 14mm f2.8 IF ED MC Lens Rokinon 14mm f2.8
96mm
87mm 552g Amazon B&H Photo
Voigtlander 28mm F2.8 Color Skopar SL II Lens Voigtlander 28mm F2.8 Color Skopar SL II
25mm
63mm 180g Amazon B&H Photo
Sigma 20mm F1.4 DG HSM A Lens Sigma 20mm F1.4 DG HSM A
130mm
91mm 950g Amazon B&H Photo
Canon EF 24mm f2.8 IS USM Lens Canon 24mm f2.8 IS USM
56mm
68mm 280g Amazon B&H Photo

Lens Mounts

Both Samyang 20mm F1.8 and Sigma 20mm F1.8 EX DG RF has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.

Samyang 20mm F1.8 is also available in Canon EF-M , Fujifilm X, Micro Four Thirds, Nikon F (FX), Pentax KAF, Samsung NX, Sony Alpha and Sony E mounts.

Sigma 20mm F1.8 EX DG RF is also available in Nikon F (DX) , Pentax KAF, Sony Alpha and Sigma SA mounts.

Focal Range

Both lenses have the same focal range of 20mm and the fastest aperture of F1.8.

Reasons to choose Samyang 20mm F1.8 ED AS UMC over Sigma 20mm F1.8 EX DG Aspherical RF

Weight 497g vs 520g 23g lighter
Diameter 83mm vs 89mm 6mm smaller in diameter
Length 88mm vs 90mm 2mm shorter
Filter Thread 77mm vs 82mm Smaller filters are cheaper and easier to find

Reasons to choose Sigma 20mm F1.8 EX DG Aspherical RF over Samyang 20mm F1.8 ED AS UMC

Diaphgragm Blades 9 vs 7 Potentially more rounded and smooth bokeh
Autofocus Yes vs No Easier, faster and more accurate focusing

Common Strengths of Samyang 20mm F1.8 ED AS UMC and Sigma 20mm F1.8 EX DG Aspherical RF
Distance Scale Yes vs Yes Distance Scale to assist focusing
Aperture Ring Yes vs Yes able to adjust the aperture on the lens
Common Weaknesses of Samyang 20mm F1.8 ED AS UMC and Sigma 20mm F1.8 EX DG Aspherical RF
Image Stabilization No vs No Reliant on in-body Image Stabilization
Weather Sealing No vs No not safe under rain and dust



**This post contains affiliate links and I will be compensated if you make a purchase after clicking through my links. As an Amazon Associate I earn from qualifying purchases.

Samyang 20mm F1.8 vs Sigma 20mm F1.8 EX DG RF Specs Table

Detailed comparison of specifications
General
Brand Samyang Sigma
Lens Type Prime Prime
Price CHECK PRICE CHECK PRICE
Lens Type Wideangle Prime Wideangle Prime
Lens Mount Canon EF Canon EF
Max Format 35mm FF 35mm FF
Focal Range 20mm 20mm
Image Stabilization No
Colour Unknown Black
Zoom Method No Zoom No Zoom
Power Zoom No No
Zoom Lock No No
Zoom Ratio 1.0X 1.0X
Aperture
Max Aperture F1.8 F1.8
Min Aperture F22 F22.0
Aperture Ring Yes Yes
Diaphragm Blades 7 9
Optics
Optical Elements 13 13
Optical Groups 12 11
Focusing
Min Focus Distance 0.2m 0.2m
Max Magnification unknown unknown
Autofocus No Yes
AF Motor Type No AF unknown
Full Time Manual Yes Yes
Focus Method Internal Rear
Distance Scale Yes Yes
DoF Scale Unknown Yes
Distance Scale Yes Yes
Focus Distance Limiter Unknown Unknown
Physical Specs
Weight 497g 520g
Diameter 83mm 89mm
Length 88mm 90mm
Materials Unknown Unknown
Weather Sealing No Unknown
Filter Thread 77mm 82mm
Filter Notes - -
Hood Supplied Yes Yes
Hood Code Unknown Unknown
Tripod Collar No No
Optional Accessories - -
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