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Canon EF 50mm f/1.8 STM Lens Review

Gary Wolstenholme reviews the new Canon EF 50mm f/1.8 STM lens, which is designed to offer smoother, quieter autofocus performance.

Handling and Features
Performance
Verdict
Specification

Canon EF 50mm f/1.8 STM Lens Review: Canon EF 50mm F1 8 STM (4)

This lens is an update to the popular and inexpensive standard 50mm f/1.8 EF lens, replacing the standard focusing motor with Canon's new stepping motor technology, which promises smoother, quieter autofocus performance, which is especially suited to recording video. Although this lens costs more than it's predecessor, it's still affordable, costing around £120. In this review, we'll take a look at how it performs.

Canon EF 50mm f/1.8 STM Handling and Features

Canon EF 50mm f/1.8 STM Lens Review: Canon EF 50mm F1 8 STM (5)

In contrast to the previous version of this lens, build quality is good, with high quality plastics used for the lens barrel and a metal bayonet. Despite the higher build quality, this optic still only weighs 160g. The lens balances well with the Canon EOS 5D MkIII body used for testing.

Autofocus is virtually silent, although it can be a little slow when compared to many other Canon lenses. Unlike many of Canon's USM lenses, full time manual focus override is not possible and manual focusing is performed by the focusing motor. Manual adjustments can be made in single focus mode once the lens has locked onto a target though. The manual focusing ring is well enough damped to prevent the focus ring rotating freely, which makes applying fine adjustments a pleasure. A small switch on the side of the lens allows switching between manual and autofocus quickly.

Canon EF 50mm f/1.8 STM Lens Review: Canon EF 50mm F1 8 STM (3)

Focusing is not performed internally, extending by around a centimetre at closest focus. Even so, the 49mm filter thread doesn't rotate, making this lens ideal for use with polarising and graduated filters.

Canon EF 50mm f/1.8 STM Lens Review: Canon EF 50mm F1 8 STM (6)

Canon EF 50mm f/1.8 STM Performance

At maximum aperture sharpness is already very good in the centre of the frame, with the clarity towards the edges of the frame falling just below fairly good levels. Stopping down improves sharpness across the frame, with peak performance being achieved at f/8. Here clarity is excellent across the frame.

Canon EF 50mm f/1.8 STM Lens Review: MTF

MTF

How to read our charts

The blue column represents readings from the centre of the picture frame at the various apertures and the green is from the edges. Averaging them out gives the red weighted column.

The scale on the left side is an indication of actual image resolution. The taller the column, the better the lens performance. Simple.

For this review, the lens was tested on a Canon EOS 5D Mark III using Imatest.
Chromatic aberrations are reasonably well controlled, remaining well below one pixel width at all aperture settings. This low level of fringing should be difficult to spot, even in harsh crops from the edges of the frame.

 

Canon EF 50mm f/1.8 STM Lens Review: CA

CA

How to read our charts

Chromatic aberration is the lens' inability to focus on the sensor or film all colours of visible light at the same point. Severe chromatic aberration gives a noticeable fringing or a halo effect around sharp edges within the picture. It can be cured in software.

Apochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimize the problem, hence they usually cost more.

For this review, the lens was tested on a Canon EOS 5D Mark III using Imatest.

Falloff of illumination towards the edges of the frame is quite strong at maximum aperture, with the corners of the frame being 2.6 stops darker than the centre. Visually uniform illumination is achieved with the aperture stopped down to f/5.6 or beyond.

Distortion is quite strong for a 50mm lens with Imatest detecting 1.89% barrel distortion. If straight lines are paramount, then you'll be glad to hear that the distortion pattern is uniform across the frame, which should make corrections straightforward to apply.

No issues with flare were encountered during testing, with only a slight loss of contrast being noticeable when shooting directly into the light at wide apertures. However, no lens hood is supplied as standard, so if you require one for peace of mind, then an ES-68 hood can set you back up to £20.

Canon EF 50mm f/1.8 STM Sample Photos

Sharpness is very good in the centre at maximum aperture | 1/200 sec | f/1.8 | 50.0 mm | ISO 100
Sharpness is very good in the centre at maximum aperture | 1/200 sec | f/1.8 | 50.0 mm | ISO 100 | high res
Stopping down produces excellent sharpness across the frame | 1/100 sec | f/6.3 | 50.0 mm | ISO 100
Stopping down produces excellent sharpness across the frame | 1/100 sec | f/6.3 | 50.0 mm | ISO 100 | high res
Closest focus is 35cm | 1/160 sec | f/3.2 | 50.0 mm | ISO 100
Closest focus is 35cm | 1/160 sec | f/3.2 | 50.0 mm | ISO 100 | high res
Contrast holds up well when shooting into the light | 1/640 sec | f/1.8 | 50.0 mm | ISO 100
Contrast holds up well when shooting into the light | 1/640 sec | f/1.8 | 50.0 mm | ISO 100 | high res
Window light portrait | 1/80 sec | f/1.8 | 50.0 mm | ISO 100
Window light portrait | 1/80 sec | f/1.8 | 50.0 mm | ISO 100 | high res
1/1000 sec | f/1.8 | 50.0 mm | ISO 100
1/1000 sec | f/1.8 | 50.0 mm | ISO 100 | high res
1/500 sec | f/2.0 | 50.0 mm | ISO 100
1/500 sec | f/2.0 | 50.0 mm | ISO 100 | high res
1/250 sec | f/1.8 | 50.0 mm | ISO 100
1/250 sec | f/1.8 | 50.0 mm | ISO 100 | high res
1/160 sec | f/1.8 | 50.0 mm | ISO 100
1/160 sec | f/1.8 | 50.0 mm | ISO 100 | high res
1/40 sec | f/5.6 | 50.0 mm | ISO 400
1/40 sec | f/5.6 | 50.0 mm | ISO 400 | high res
Sharpness is very good in the centre at maximum aperture | 1/200 sec | f/1.8 | 50.0 mm | ISO 100
Stopping down produces excellent sharpness across the frame | 1/100 sec | f/6.3 | 50.0 mm | ISO 100
Closest focus is 35cm | 1/160 sec | f/3.2 | 50.0 mm | ISO 100
Contrast holds up well when shooting into the light | 1/640 sec | f/1.8 | 50.0 mm | ISO 100
Window light portrait | 1/80 sec | f/1.8 | 50.0 mm | ISO 100
1/1000 sec | f/1.8 | 50.0 mm | ISO 100
1/500 sec | f/2.0 | 50.0 mm | ISO 100
1/250 sec | f/1.8 | 50.0 mm | ISO 100
1/160 sec | f/1.8 | 50.0 mm | ISO 100
1/40 sec | f/5.6 | 50.0 mm | ISO 400

Value For Money

Currently, this lens is available for around £120, which seems quite reasonable, especially as Nikon's equivalent 50mm f/1.8 currently costs around £135.

Canon EF 50mm f/1.8 STM Verdict

Canon's old 'Nifty Fifty' was a popular lens despite its poor build quality as it represented such good value for money. Even though this lens costs more than its predecessor, it still represents great value due to the high levels of sharpness it produces. The improved build quality is welcome too and should win over many fans as a result.

Canon EF 50mm f/1.8 STM Lens Review: The Canon EF 50mm f/1.8 STM lens is lightweight, quiet and delivers very good sharpness.

View Full Product Details

Canon EF 50mm f/1.8 STM Specifications

Manufacturer
Canon
General
Lens Mounts
Canon EF
Canon EF-S
Lens
Focal Length
50mm
Angle of View
46°
Max Aperture
f/1.8
Min Aperture
f/22
Filter Size
49mm
Stabilised
No
35mm equivalent
No Data
Internal focusing
No
Maximum magnification
No Data
Focusing
Min Focus
35cm
Construction
Blades
7
Elements
6
Groups
5
Box Contents
Box Contents
Front and rear caps
Dimensions
Weight
160g
Height
39.3mm

Canon EF 50mm f/1.8 STM Verdict

Features
Handling
Performance
Value for money
Verdict
Pros
  • Very good sharpness in the centre at maximum aperture
  • Excellent sharpness when stopped down
  • Lightweight
  • Silent focusing
  • Good build quality
Cons
  • Sluggish focus speeds
  • Sharpness could be better towards the edges at fast apertures

Comments

Simon_Marlow20560
Simon_Marlow20560
20 560
Jun 16, 2015 2:14pm
I have one of these which i received a week ago which i have been using with my 70D, impressed so far.
paulashby
paulashby
15 10
Jul 17, 2015 6:16pm
Got one today, impressive with great bokeh and it aint that slow.