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Lack of sharpness at f1.8 on Canon 50mm STM

Started 4 months ago | Discussions thread
John Sheehy Forum Pro • Posts: 26,698
Re: All at F1.8, no processing

norman shearer wrote:

All pics taken wide open by my 10 year old grandson who was using my 5D Mk1 for the very first time.

Looks like you may have done some cropping, which we really need to know to consider how the DOF is working out. Standing farther away and cropping increases DOF, and also brings the background relatively closer to the subject.

I will have to try this lens on the Mk2 and see if the focus needs some micro adjustment which is a possibility and I suspect part of the perceived variability. That said I think it is sharp enough on the 5D Mk1 to not be a concern,

You can look at that from two perspectives; if the camera you have is a 12.5MP FF, then there is less visible penalty for using a softer lens than there would be with a 21MP FF, but the 21MP will always have more resolution than the 12.5MP, even if the pixels look sharper from the 12.5MP at 100% pixel view.

One plus for the original 5D, however, is that its color filters are stronger and separate color better than the 5D2's filters, when you are shooting well-exposed images at low ISOs.

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Beware of correct answers to wrong questions.
John
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