re: Canon T3i Nifty 50 Lens
I own both lenses, and although I use them on a T4i (and GH2) instead of a T3i, the camera differences won't impact the lens differences, which are:
the 1.4 has much better build quality.
the 1.4 auto-focuses faster and more quietly than the 1.8.
the 1.4 manual focus ring is smoother, longer and tighter, making it easier to use.
the 1.4 manual focus ring is also active at all times. i.e. you can have it in AF mode and manually override the AF.
the 1.4 has 8 aperture blades, whereas the 1.8 has 5 (which gives the 1.4 smoother bokeh).
And obviously, the 1.4 is brighter than the 1.8 - Mark
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