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26 of 41 specs differ
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Pros Pros
  • Quiet, fast, and smooth STM autofocus
  • Improved build quality featuring a metal mount
  • Excellent sharpness and optical performance for the price
  • Compact, lightweight, and versatile handling
  • Attractive bokeh with seven rounded aperture blades
Pros
  • Extremely compact and lightweight pancake design
  • Excellent sharpness and optical clarity
  • Durable build quality featuring a metal mount
  • Affordable price point
  • Smooth and accurate autofocus motor
Cons Cons
  • Strong vignetting and corner softness at wide apertures
  • Autofocus is not silent and can be slow
  • Bokeh quality can appear busy or smeared
  • Lack of weather sealing and basic construction
  • No included lens hood and non-standard filter size
Cons
  • Inconsistent or slow autofocus speed
  • Limited manual focus functionality
  • Audible autofocus noise during video recording
  • Noticeable vignetting at wide apertures
  • Lack of included lens hood

Launch price Launch price $129.99 Launch price $199
Focal length & aperture Focal length & aperture 50mm f/1.8 Focal length & aperture 40mm f/2.8
Mount & coverage Mount & coverage Canon EF · Full-Frame Mount & coverage Canon EF · Full-Frame
Stabilization Stabilization None Stabilization None
Close focus Close focus 35 cm (0.21x) Close focus 30 cm (0.18x)
Filter thread Filter thread 49mm Filter thread 52mm
Autofocus motor Autofocus motor STM Autofocus motor STM
Weight & size Weight & size 160g (5.6 oz) · 69.2 x 39.2 mm (2.72 x 1.54 in) Weight & size 130g (4.6 oz) · 68 x 22 mm (2.68 x 0.87 in)

Announcement date Announcement date May 11, 2015 Announcement date June 1, 2012
Launch MSRP Launch MSRP $129.99 Launch MSRP $199
Lens mount Lens mount Canon EF Lens mount Canon EF
Image circle coverage Image circle coverage Full-Frame Image circle coverage Full-Frame
Lens type Lens type Prime Lens type Prime
Lens line / series Lens line / series — Lens line / series EF

Elements Elements 6 Elements 6
Groups Groups 5 Groups 4
Special elements Special elements — Special elements 1 aspherical
Coatings Coatings — Coatings Super Spectra Coating
Front fluorine coating Front fluorine coating — Front fluorine coating No

Focal length (wide) Focal length (wide) 50mm Focal length (wide) 40mm
Max aperture Max aperture f/1.8 Max aperture f/2.8
Minimum aperture Minimum aperture f/22 Minimum aperture f/22
Diaphragm blades Diaphragm blades 7 Diaphragm blades 7

Diagonal angle of view Diagonal angle of view 46° Diagonal angle of view 57° - 30°

Autofocus motor Autofocus motor STM Autofocus motor STM
Minimum focus distance Minimum focus distance 35 cm Minimum focus distance 30 cm
Maximum magnification Maximum magnification 0.21x Maximum magnification 0.18x
Focus mechanism Focus mechanism Extending barrel Focus mechanism Internal focus

Optical stabilization (OIS) Optical stabilization (OIS) No Optical stabilization (OIS) No

Aperture ring Aperture ring No Aperture ring No
AF/MF switch AF/MF switch Yes AF/MF switch No

Weight Weight 160g (5.6 oz) Weight 130g (4.6 oz)
Maximum diameter Maximum diameter 69.2mm (2.72 in) Maximum diameter 68mm (2.68 in)
Length Length 39.2mm (1.54 in) Length 22mm (0.87 in)
Filter thread Filter thread 49mm Filter thread 52mm
Weather sealing Weather sealing None Weather sealing None
Tripod collar Tripod collar Not supported Tripod collar Not supported
Internal zoom Internal zoom — Internal zoom No
Maximum extended length Maximum extended length — Maximum extended length 22.8mm

Lens hood Lens hood ES-68, optional Lens hood ES-52, optional
Teleconverter compatibility Teleconverter compatibility Not supported Teleconverter compatibility Not supported