I believe any canonians will be agree with me that the EF 50mm 1.4 USM are hard to use lens, temperamentals in short. Old gaussian design, old type USM motor that when it is worn out, you can always be left in wonder why all these missed focus. Recently my 50mm were in the need in that good attentions, need some caring after I took many- many missed focus photos.
What I did was disasembled the lens, cleaning any nook and crannies, and put some silicone lubricants on the helicoid, gears and follower cams. The result is fantastic, as I happened to do a photoshoot again with Ochie. Not as tack sharp as his bigger brother 85mm 1.8 USM, but the beautiful bokeh and larger field of view, make one difficult to choose between those two beast.
And here’s the result with that cleaned and oiled Lens.
You might be notice some softness, and that because I forgot to readjust micro focus adjustment in my 5Dmk2. The next photoshoot on the following week, the lens nailed everyshot tack sharp!
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