Why are some of my photos tack sharp while others in the same series are out of focus?

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10-09-2014 06:29 PM - edited 10-09-2014 06:31 PM
My camera is a Canon Rebel XS (dSLR) and I primarily use the 50mm f/1.8 lens.
I shoot in Manual Mode with Autofocus ON.
I am having difficulty with my photos coming out incositant - some are out of focus, while others in the same series (taken a moment apart) are tack sharp.
I've attached two examples - one of the out-of-focus image, the other sharp images (both have been blown up).
It is not camera shake and my settings are identical for both photos. (ISO 200 | f/4.5 | 1/100sec in this instance.)
This has become such a problem that I find myself needing to take 10x more photos of the same subject/pose in order to hopefully get one sharp image from the series.
I have asked multiple people about this problem (though I have yet to take my camera and lens to a shop due to lack of funds) and no one has any idea of either what I'm talking about or what the problem could be.
I would appreciate your thoughts and help!
Thank you!
Fuzzy/Out of Focus:
Sharp:

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10-11-2014 01:22 PM
I plan to perform the focus test in the next couple days.

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10-17-2014 07:58 AM
I would check your focus with live view to determine if it's lens or camera body. Live view and viewfinder use different systems for autofocus, Canon has had a huge problem with viewfinder autofocus consistency with the 7D and now the 70D.
Good luck, I'm wrestling with the save viewfinder autofocus incosistency on my 70D.
BMac
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10-17-2014 09:46 AM
I also think it is camera motion or shake. As nothing seems in focus. With a 50mm lens at f4.5 one would think something would be in focus. I am not a fan of ths Canon lens. I have never been but lots of folks are and they like it.
I agree the lens may be faulty and you must confirm it is OK
EOS 1D, EOS 1D MK IIn, EOS 1D MK III, EOS 1Ds MK III, EOS 1D MK IV and EOS 1DX and many lenses.

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10-21-2014 10:19 AM
If it's tack sharp in live view and not in viewfinder thens it's not the lens.
BMac

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