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Samyang 20mm F1.8 ED AS UMC vs Rokinon 24mm f1.4 Aspherical

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Samyang 20mm F1.8

Wideangle Prime | Pentax KAF

Samyang 20mm F1.8 ED AS UMC
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BUY from B&H PHOTO
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Rokinon 24mm f1.4

Wideangle Prime | Pentax KAF

Rokinon 24mm f1.4 Aspherical
CHECK PRICE

BUY from B&H PHOTO

Samyang 20mm F1.8 vs Rokinon 24mm f1.4 Comparison Overview

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

Samyang 20mm F1.8 Key Specs

  • 20mm Focal Range
  • F1.8 Max Aperture
  • Filter Thread: 77mm
  • Max Format: 35mm FF
  • Pentax KAF Mount
  • Weight: 497g.
  • Diameter: 83mm
  • Length: 88mm
  • 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
  • Pentax KAF Mount
  • Weight: 580g.
  • Diameter: 83mm
  • Length: mm
  • Min Focus Distance:0.25m

What type of photography are the Samyang 20mm F1.8 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 Samyang 20mm F1.8 and the Rokinon 24mm f1.4 for their suitability to various photography scenarios:

Photography Type Samyang 20mm F1.8 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. Samyang 20mm F1.8 weighs 497g, which means it is 83g (14%) 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 Pentax KAF Mount for size comparison purposes.

Wideangle Prime Lenses in Pentax KAF Mount for Size Comparison
Model Length Diameter Weight Street Price
Pentax smc FA 31mm F1.8 AL Limited Lens Pentax FA 31mm F1.8 L
69mm
65mm 345g Amazon B&H Photo
HD Pentax-FA 31mm F1.8 Limited Lens HD Pentax-FA 31mm F1.8 Ltd
69mm
65mm 341g Amazon B&H Photo
HD Pentax DA 21mm F3.2 AL Limited Lens Pentax 21mm F3.2 AL L
25mm
63mm 134g Amazon B&H Photo
HD Pentax DA 15mm F4 ED AL Limited Lens Pentax 15mm F4 ED AL L
40mm
63mm 189g Amazon B&H Photo
Voigtlander 20mm F3.5 Color Skopar SL II Lens Voigtlander 20mm F3.5 SL II
29mm
63mm 205g Amazon B&H Photo
Samyang 35mm F1.4 AS UMC Lens Samyang 35mm F1.4
112mm
63mm 660g Amazon B&H Photo
Carl Zeiss Distagon T 228 Lens Carl Zeiss Distagon T2/28
93mm
64mm 520g Amazon B&H Photo
Pentax smc DA 21mm F3.2 AL Limited Lens Pentax 21mm F3.2 AL L
25mm
63mm 140g Amazon B&H Photo

Lens Mounts

Both Samyang 20mm F1.8 and Rokinon 24mm f1.4 has the same Pentax KAF lens mount. Some of the latest released cameras that are compatible with the Pentax KAF lenses are Pentax KF, Pentax K-3 III and Pentax K-1 II.

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

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

Focal Range

Samyang 20mm F1.8 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 Samyang 20mm F1.8 ED AS UMC over Rokinon 24mm f1.4 Aspherical

Focal Length - Wide 20mm vs 24mm 4mm Wider coverage
Diaphgragm Blades 7 vs Potentially more rounded and smooth bokeh
Weight 497g vs 580g 83g lighter
Minimum Focus Distance 0.2m vs 0.25m can focus closer to the subject

Reasons to choose Rokinon 24mm f1.4 Aspherical over Samyang 20mm F1.8 ED AS UMC

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
Length mm vs 88mm 88mm shorter

Common Strengths of Samyang 20mm F1.8 ED AS UMC and Rokinon 24mm f1.4 Aspherical
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 Rokinon 24mm f1.4 Aspherical
Image Stabilization No vs No Reliant on in-body Image Stabilization
Autofocus No vs No Slow and less accurate focusing
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 Rokinon 24mm f1.4 Specs Table

Detailed comparison of specifications
General
Brand Samyang Rokinon
Lens Type Prime Prime
Price CHECK PRICE CHECK PRICE
Lens Type Wideangle Prime Wideangle Prime
Lens Mount Pentax KAF Pentax KAF
Max Format 35mm FF 35mm FF
Focal Range 20mm 24mm
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 F1.4
Min Aperture F22 F22.0
Aperture Ring Yes Yes
Diaphragm Blades 7 unknown
Optics
Optical Elements 13 13
Optical Groups 12 12
Focusing
Min Focus Distance 0.2m 0.25m
Max Magnification unknown unknown
Autofocus No No
AF Motor Type No AF None
Full Time Manual Yes N/A
Focus Method Internal Unknown
Distance Scale Yes Yes
DoF Scale Unknown Yes
Distance Scale Yes Yes
Focus Distance Limiter Unknown Unknown
Physical Specs
Weight 497g 580g
Diameter 83mm 83mm
Length 88mm Unknown
Materials Unknown Unknown
Weather Sealing No No
Filter Thread 77mm 77mm
Filter Notes - -
Hood Supplied Yes Unknown
Hood Code Unknown Unknown
Tripod Collar No No
Optional Accessories - -
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