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EOS 350D and Canon 50mm f1.8

Started Dec 14, 2014 | Questions thread
ZX11
ZX11 Veteran Member • Posts: 6,156
Re: EOS 350D and Canon 50mm f1.8

WilbaW wrote:

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.

Could this ambiguous light thing be a problem with the canon 50mm f1.4?  I am trying to figure out what it needs to hit focus more accurately.  I am starting to think I need to ditch the lens filter on it and install a hood as one step in improving the keeper rate when wide open.

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