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Owner reviews: Canon EF 40 mm f/ 2.8 STM
Strengths:
Very sharp lens wide open, sharper than the old Canon EF 35mm f/2 (when using the same aperture).
Very compact, very light, very small.
Full time manual focus availlable all time (meanwhile it is powered).
Quiet focus motor.
Weaknesses:
No DOF scale, no distance scale.
Focus by whire.
Expensive lens hood.
No weather seal.
Slow STM focus motor.
Comments:
This small lens is very sharp, I'm very happy using it on my full frame camera.
Previously I used a Canon EF 35mm f/2 lens, but this 40mm lens is more sharper, smaller and lighter.
One drawnback for me is the lack of a proper distance and DOF scale, from time to time I like to use a hiperfocal distance in order to shot without focusing, without a proper scale this is a mess.
Another thing I do not like about this lens is the focus by whire, if you focus manually there is a lag between your movement and the movement of the motor. In any case the focus is accurate and smooth.
If do not need a more wider aperture this lens is a bargain for full frame camera users.
