Physical
Plastic covering
Light weight
Focus Ring
Extremely smooth to use
Only can be used when camera is on because it is attached to the STM motor
Auto Focus
Front element doesn't turn
Sharpness
APS-C
55mm - Sharp in the middle and in corners
Good contrast
135mm - Sharp in the middle but little bit soft in the corners
Sharper at f/8
250mm - Middle is sharp, soft in the corners
Sharper at f/8
Not quite contrast
Distortion
At 55mm, some distortions visible.
At 250mm, minor distortions visible.
Vignetting
At 55mm, slight vignetting, corrected at f/5.6.
At 250mm, heavy vignetting, corrected at f/8.
Chromatic aberration
At 55mm, slight hint of chromatic aberration in the edges.
At 135mm, no chromatic aberration.
At 250mm, moderate chromatic aberration. Can be corrected with in camera chromatic aberration correction
Stabilization
Smooth, good
Works perfectly
Zoom ring
Nice and smooth
Bokeh
Harsh
Switches
Image stabilization ON or OFF
AF or MF
Notes
Update camera/s lens profiles in EOS utility in computer to get peripheral illumination.
Has 7 aperture blade, can get 14 point sun stars
Check out the lens on Amazon:
Sources (information) https://www.youtube.com/watch?v=N5wZAvUmPUA
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