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Product comparison · 2 lenses

Canon RF-S 3.9mm F3.5 STM DUAL FISHEYE vs Canon RF20mm F1.4 L VCM

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  • 22specifications compared
  • 12differ
  • 10identical
  • 23known for one product only

Key differences

The Canon RF-S 3.9mm F3.5 STM DUAL FISHEYE has 50° more lens viewing angle, diagonal than the Canon RF20mm F1.4 L VCM (144° vs 94°). The Canon RF-S 3.9mm F3.5 STM DUAL FISHEYE has 2.1 more maximum aperture number than the Canon RF20mm F1.4 L VCM (3.5 vs 1.4). The Canon RF20mm F1.4 L VCM has 4 more diaphragm blades than the Canon RF-S 3.9mm F3.5 STM DUAL FISHEYE (11 vs 7). Only the Canon RF20mm F1.4 L VCM has dustproof. Lens structure (elements/groups): 11/8 on the Canon RF-S 3.9mm F3.5 STM DUAL FISHEYE, 15/11 on the Canon RF20mm F1.4 L VCM.

  • Lens structure (elements/groups)
    • 11/8
    • 15/11
  • Lens type
    • Wide fish-eye lens
    • Wide-angle
  • Lens viewing angle, diagonal
    • 144°
    • 94°
  • Maximum aperture number
    • 3.5
    • 1.4
  • Number of diaphragm blades
    • 7
    • 11
  • Maximum magnification
    • 0.03x
    • 0.19x
  • Dustproof
    • No
    • Yes
  • Diameter
    • 11.2 cm
    • 7.65 cm

Side by side

Differences highlightedShow differences only
45 specifications
A

Canon

RF-S 3.9mm F3.5 STM DUAL FISHEYEView product
B

Canon

RF20mm F1.4 L VCMView product
Lens system5 differ
Lens structure (elements/groups)Differs11/815/11
Lens typeDiffersWide fish-eye lensWide-angle
Fixed focal lengthKnown for one20 mm
Lens viewing angle, diagonalDiffers144°94°
Maximum aperture numberDiffers3.51.4
Number of aspheric elementsKnown for one2
Number of diaphragm bladesDiffers711
Zoom capabilityKnown for oneNo
Lens viewing angle, horizontalKnown for one144°
Lens viewing angle, verticalKnown for one144°
Image sensor formatKnown for oneAPS-C
Performance2 differ
Auto focusKnown for oneYes
Lens coating featuresDiffersAir Sphere Coating (ASC)Air Sphere Coating (ASC), Fluorine coating, Sub-wavelength Structure Coating (SWC)
Manual focusKnown for oneYes
Maximum magnificationDiffers0.03x0.19x
Ultrasonic motor (USM)Known for oneYes
Lens hoodKnown for oneYes
Lens hood shapeKnown for onePetal lens hood
Lens hood typeKnown for oneRemovable lens hood
Lens hood modelKnown for oneEW-73H
AF actuatorKnown for oneSTM
CompatibilityKnown for oneEOS R7
Design1 differ
Market segmentKnown for oneProfessional
Mounting typeKnown for oneBayonet
DustproofDiffersNoYes
WeatherproofKnown for oneYes
Moisture-resistantKnown for oneNo
Weight & dimensions4 differ
DiameterDiffers11.2 cm7.65 cm
Filter sizeDiffers30.5 mm67 mm
LengthDiffers54.6 mm99.3 mm
WeightDiffers290 g519 g
Extended lengthKnown for one8.37 cm
Packaging contentidentical
Bag includedKnown for oneYes
Bag modelKnown for oneLP1219
Lens cap modelKnown for oneE-67II

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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