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EOS 350D and Canon 50mm f1.8

Started Dec 14, 2014 | Questions thread
WilbaW
WilbaW Forum Pro • Posts: 11,643
Re: EOS 350D and Canon 50mm f1.8

Susan S. wrote:

my copy of the 50 1.8 generally front focuses a bit, but also will pick something infront or slightly behind the plane of focus-it is particularly fond of almost invisible stray hairs. or it will focus on nothing at all.

A typical 50/1.8 provides ambiguous light to the AF sensors (the most likely culprit is spherical aberration, which is high with that lens). It make it hard for the system to accurately and reliably determine where focus should be. Also results in the typical overall image softness we see with that lens wide open.

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