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Sigma 20mm F1.8 EX DG Aspherical RF vs Rokinon 24mm f1.4 Aspherical

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Sigma 20mm F1.8 EX DG RF

Wideangle Prime | Sony Alpha

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

BUY from B&H PHOTO
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Rokinon 24mm f1.4

Wideangle Prime | Sony Alpha

Rokinon 24mm f1.4 Aspherical
CHECK PRICE

BUY from B&H PHOTO

Sigma 20mm F1.8 EX DG RF vs Rokinon 24mm f1.4 Comparison Overview

In this review, we will be comparing Sigma 20mm F1.8 EX DG RF and Rokinon 24mm f1.4, two Wideangle Prime lenses from Sigma and Rokinon.

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.

Sigma 20mm F1.8 EX DG RF Key Specs

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

Rokinon 24mm f1.4 Key Specs

  • 24mm Focal Range
  • F1.4 Max Aperture
  • Filter Thread: 77mm
  • Max Format: 35mm FF
  • Sony Alpha Mount
  • Weight: 580g.
  • Diameter: 83mm
  • Length: mm
  • Min Focus Distance:0.25m

What type of photography are the Sigma 20mm F1.8 EX DG RF and Rokinon 24mm f1.4 lenses good for?

The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 20mm F1.8 EX DG RF and the Rokinon 24mm f1.4 for their suitability to various photography scenarios:

Photography Type Sigma 20mm F1.8 EX DG RF Rokinon 24mm f1.4
Bird/WildlifePoorPoor
SportsPoorPoor
PortraitFairFair
TravelAverageAverage
StreetExcellentExcellent
WeddingFairFair
Walk AroundAverageAverage
VloggingVery GoodVery Good
LandscapeGoodGood

Size and Weight Comparison

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. Sigma 20mm F1.8 EX DG RF weighs 520g, which means it is 60g (10%) lighter than the Rokinon 24mm f1.4 which has a weight of 580g.


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

Wideangle Prime Lenses in Sony Alpha Mount for Size Comparison
Model Length Diameter Weight Street Price
Sony 35mm F1.4 G Lens Sony 35mm F1.4 G
76mm
69mm 510g Amazon B&H Photo
Sony 28mm F2.8 Lens Sony 28mm F2.8
43mm
66mm 185g Amazon B&H Photo
Sony 24mm F2 SSM Carl Zeiss Distagon T Lens Sony 24mm F2 SSM CZ
76mm
78mm 555g Amazon B&H Photo
Sigma 35mm F1.4 DG HSM Lens Sigma 35mm F1.4 DG HSM
94mm
77mm 665g Amazon B&H Photo
Tamron SP 35mm F1.8 Di VC USD Lens Tamron 35mm F1.8 Di VC USD
81mm
80mm 450g Amazon B&H Photo
Sony DT 35mm F1.8 SAM Lens Sony DT 35mm F1.8 SAM
52mm
70mm 170g Amazon B&H Photo
Sony 20mm F2.8 Lens Sony 20mm F2.8
54mm
78mm 285g Amazon B&H Photo
Rokinon 14mm f2.8 IF ED MC Lens Rokinon 14mm f2.8
96mm
87mm 552g Amazon B&H Photo

Lens Mounts

Both Sigma 20mm F1.8 EX DG RF and Rokinon 24mm f1.4 has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.

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

Rokinon 24mm f1.4 is also available in Canon EF , Nikon F (FX), Four Thirds, Pentax KAF and Samsung NX mounts.

Focal Range

Sigma 20mm F1.8 EX DG RF is a prime lens with fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 30mm.
Rokinon 24mm f1.4 is a prime lens with fixed focal lenght of 24mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 36mm.

Reasons to choose Sigma 20mm F1.8 EX DG Aspherical RF over Rokinon 24mm f1.4 Aspherical

Focal Length - Wide 20mm vs 24mm 4mm Wider coverage
Diaphgragm Blades 9 vs Potentially more rounded and smooth bokeh
Autofocus Yes vs No Easier, faster and more accurate focusing
Weight 520g vs 580g 60g lighter
Minimum Focus Distance 0.2m vs 0.25m can focus closer to the subject

Reasons to choose Rokinon 24mm f1.4 Aspherical over Sigma 20mm F1.8 EX DG Aspherical RF

Focal Length - Tele 24mm vs 20mm 4mm more Tele coverage
Max Aperture - Wide 1.4 vs 1.8 Wider aperture at wide end
Max Aperture - Tele 1.4 vs 1.8 Wider aperture at tele end
Diameter 83mm vs 89mm 6mm smaller in diameter
Length mm vs 90mm 90mm shorter
Filter Thread 77mm vs 82mm Smaller filters are cheaper and easier to find

Common Strengths of Sigma 20mm F1.8 EX DG Aspherical RF and Rokinon 24mm f1.4 Aspherical
Autofocus Yes vs Yes Easier, faster and more accurate focusing
Distance Scale Yes vs Yes Distance Scale to assist focusing
Depth-of-Field Scale Yes vs Yes Depth of Field scale to assist focusing
Aperture Ring Yes vs Yes able to adjust the aperture on the lens
Common Weaknesses of Sigma 20mm F1.8 EX DG Aspherical RF and Rokinon 24mm f1.4 Aspherical
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.

Sigma 20mm F1.8 EX DG RF vs Rokinon 24mm f1.4 Specs Table

Detailed comparison of specifications
General
Brand Sigma Rokinon
Lens Type Prime Prime
Price CHECK PRICE CHECK PRICE
Lens Type Wideangle Prime Wideangle Prime
Lens Mount Sony Alpha Sony Alpha
Max Format 35mm FF 35mm FF
Focal Range 20mm 24mm
Image Stabilization No No
Colour Black 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 F1.4
Min Aperture F22.0 F22.0
Aperture Ring Yes Yes
Diaphragm Blades 9 unknown
Optics
Optical Elements 13 13
Optical Groups 11 12
Focusing
Min Focus Distance 0.2m 0.25m
Max Magnification unknown unknown
Autofocus Yes No
AF Motor Type unknown None
Full Time Manual Yes N/A
Focus Method Rear Unknown
Distance Scale Yes Yes
DoF Scale Yes Yes
Distance Scale Yes Yes
Focus Distance Limiter Unknown Unknown
Physical Specs
Weight 520g 580g
Diameter 89mm 83mm
Length 90mm Unknown
Materials Unknown Unknown
Weather Sealing Unknown No
Filter Thread 82mm 77mm
Filter Notes - -
Hood Supplied Yes Unknown
Hood Code Unknown Unknown
Tripod Collar No No
Optional Accessories - -
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