Updated: Nov 28, 2018
Is a 2012 lens, but only arrived to my collection in 2016.
And I wonder why it took me so long to get this one!
This lens is a STM lens, which for film lovers allows silent refocusing during movie recording, and can be set up in SLR's or Mirrorless systems. Its odd focal length is different from traditional 35mm or 50mm, making this lens very unique.
The argument of perfect angle view still stands. Some people defend 35mm as the perfect normal, others defend 50mm is the perfect match. Therefore, Canon did a great job satisfying everyone.
A nice characteristic about this "pancake" prime lens is the size and weight: 22mm (or 0.9'inch) thick and weights only 130g (4.5oz). Making this lens the most portable and discrete lens to carry around. If you do like street or urban photography, you will definitely love how discrete this compact lens is while shooting in the streets. To understand what I'm referring to, try to go into a big city with a big lens and you'll find yourself observed. If the intention is to be discrete and submerge in the moment you are capturing, this is the great profile you are looking for.
In terms of composition, Canon has still managed to fit in a 6 element / 4 group optical unit that includes an aspherical element to help reduce aberrations.
Depending on your needs, this can be a perfect economic option lens, and I definitely will keep using mine as a camera standard until I need other wider or zoom lenses.
Focal Length & Maximum Aperture - 40mm, 1:2.8
Lens Construction - 6 elements in 4 groups
Diagonal Angle of View - 57°30'
Focus Adjustment - STM with Full Lens Extension System
Closest Focusing Distance - 0.98 ft./0.3m
Filter Size - 52mm
Max. Diameter x Length, Weight - 2.7 x 0.9 inch, 4.6 oz. / 68.2 x 22.8mm, 130g
Cons: Lack of Image Stabilization is a limitation if you shoot videos handheld; Sharpness could be slightly better.
So highly dependent on the use you intend, but this lens is perfect if you want a simple, light and low profile lens for your photos.
Overall rate: 6/10
Photos: f9 - 1/40sec ; f6.3 - 1/80sec ; f4.5 - 1/160sec