As skysurfer mentions above, the 50mm becomes approximately 85mm on an APS-C sensor. The absolute perfect head and shoulders portrait lens.
It can also be used for mosaicing landscapes.
If you were after a 50mm equivalent, then you'd be after something in the 35mm focal length range.
Otherwise, the 50mm f/1.4 is great bang for buck. The thrifty fifty, (f/1.8) feels like a plastic toy, but, delivers exceptional images for the investment.
I had moderate success with both the f/1.4 (stopped down to f/2.5) for astro work.
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