Impact of UV filter on sharpness of shot

Started Jun 29, 2012 | Discussions thread
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Jarvis393 Contributing Member • Posts: 544
Impact of UV filter on sharpness of shot

I photographed a kitchen yesterday that my cabinet shop produced.

The shots were taken on a tripod with a Canon 5dmk2 and 24-70L lens. They were shot at 7.1F stop @ ISO 320.

Ordinarily I shoot these tethered to a laptop so I can see what is going on but yesterday I just relied on the little screen on back.

The images were pretty good when I looked at them on the computer albeit not as sharp as I expected. I used auto focus mostly and dialed the lens in until it beeped at me. There were only a couple of shots that the lens could not find enough contrast to lock onto so on these I switched to manual focus.

THREE QUESTIONS (maybe more later)

I keep a UV filter on the lens, not so much for UV protection as to merely protect the glass on the L lens from being scratched. I forgot to remove it for this shoot.

1) Does keeping the UV filter on the lens create diffraction that would contribute to a lack of sharpness?

Also, what is the best approach to AF selection?

2) When shooting with auto focus should I let the lens be in charge of AF points?
(i.e. have all the red AF points lit up)

3) Is selecting a particular AF point only for when the lens is set for manual focus?

Canon EOS 5D
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