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Home » Compare Lenses » Pentax HD DA 21mm F3.2 AL Limited vs Sigma 20mm F1.8 EX DG Aspherical RF

Pentax HD DA 21mm F3.2 AL Limited vs Sigma 20mm F1.8 EX DG Aspherical RF

Looking to find more information regarding these two camera lenses? Check out our side by side comparison of the HD Pentax DA 21mm F3.2 AL Limited vs Sigma 20mm F1.8 EX DG Aspherical RFto review specs, pros and cons, and which is right for you.

Pentax 21mm F3.2 AL L Top Features

  • 21mm Focal Range
  • F3.2 Max Aperture
  • Filter Thread: 49mm
  • Max Format: APS-C / DX
  • Pentax KAF Mount
  • Weight: 134g.
  • Diameter: 63mm
  • Length: 25mm
  • Min Focus Distance:0.2m
  • Max Magnification:0.17x

HD Pentax DA 21mm F3.2 AL Limited

Sigma 20mm F1.8 EX DG RF Top Features

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

Sigma 20mm F1.8 EX DG Aspherical RF

Our Winner: HD Pentax DA 21mm F3.2 AL Limited over Sigma 20mm F1.8 EX DG Aspherical RF

Focal Length – Tele 21mm vs 20mm
Weight 134g vs 520g
Diameter 63mm vs 89mm
Length 25mm vs 90mm
Filter Thread 49mm vs 82mm
Max Magnification 0.17x vs x

Pros Of Sigma 20mm F1.8 EX DG Aspherical RF over HD Pentax DA 21mm F3.2 AL Limited
Focal Length – Wide 20mm vs 21mm
Max Aperture – Wide 1.8 vs 3.2
Max Aperture – Tele 1.8 vs 3.2
Diaphgragm Blades 9 vs 7
Aperture Ring Yes vs No
Max Sensor Coverage 35mm FF vs APS-C / DX

Cons Of HD Pentax DA 21mm F3.2 AL Limited and Sigma 20mm F1.8 EX DG Aspherical RF
Image Stabilization No vs No
Weather Sealing No vs No

Pentax 21mm F3.2 AL L vs Sigma 20mm F1.8 EX DG RF All Features

General Pentax 21mm F3.2 AL L Sigma 20mm F1.8 EX DG RF
Brand Pentax Sigma
Lens Type Prime Prime
Price CHECK PRICE CHECK PRICE
Lens Type Wideangle Prime Wideangle Prime
Lens Mount Pentax KAF Pentax KAF
Max Format APS-C / DX 35mm FF
Focal Range 21mm 20mm
Image Stabilization No No
Colour Black, Silver Black
Zoom Method No Zoom No Zoom
Power Zoom No No
Zoom Lock No No
Zoom Ratio 1.0X 1.0X
Aperture
Max Aperture F3.2 F1.8
Min Aperture F22.0 F22.0
Aperture Ring No Yes
Diaphragm Blades 7 9
Optics
Optical Elements 8 13
Optical Groups 5 11
Special Elements High-grade multi-layer HD (High Definition) Coating 2 aspherical elements
Focusing
Min Focus Distance 0.2m 0.2m
Max Magnification 0.17X unknown
Autofocus Yes Yes
AF Motor Type Screw drive from camera unknown
Full Time Manual Yes Yes
Focus Method Unknown Rear
Distance Scale Yes Yes
DoF Scale Yes Yes
Distance Scale Yes Yes
Focus Distance Limiter Unknown Unknown
Physical Specs
Weight 134g 520g
Diameter 63mm 89mm
Length 25mm 90mm
Materials Unknown Unknown
Weather Sealing Unknown Unknown
Filter Thread 49mm 82mm
Filter Notes
Hood Supplied Yes Yes
Hood Code MH-RBB43 petal type hood
Tripod Collar No No
Optional Accessories
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