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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 07 Jun 2013 (Friday) 07:03
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Depth of field at wide apertures

 
aquaforester
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Jun 07, 2013 16:43 |  #16

That's a good visual tool for me, thanks!

gasrocks wrote in post #16008245 (external link)
I think you got the nose and neither eye. "Wide" apertures is not a term I know.

I think you need to look at the pic again :)


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JeffreyG
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Jun 07, 2013 17:41 |  #17

alann wrote in post #16009154 (external link)
It was not my intention to cause a ruckus. :) Just thought that it might help someone understand that these apertures are difficult and don't expect to put on the lens for the first time and get really good results. It just seems that many people are buying these lenses and posting how they have focus issues without realizing there is a learning curve (which I am still in) Here is the un cropped photo

It's true enough that very large apertures can result in very thin DOF, which in turn will require precise focusing.

That said, the example image is kind of extreme. I mean, as a portrait this is pretty much useless because the majority of the subject is out of focus.

The reality is, if you want to shoot a fairly tight headshot like this one while still blurring the background, your best bet is a much longer lens with a much smaller aperture. A 200mm lens at f/2.8 would be a lot better (as a start) and really I would probably never shoot a person this tight at anything faster than f/5.6.

As a point of reference, something like a 400mm lens at f/8 or so would be a much better choice for a headshot this tight as the subject would be totally in focus and the background would be just as blurred.

Missing focus on this shot at f/1.2 would be just one of the problems with it. I mean, a miss on the focus just changes which bit of the subject is OOF, it doesn't change the fact that most of the subject is OOF.

When you use very large apertures at realistic framing, it is possible to get accurate focus even of fast action and motion with lenses like the 85L. Things like this:


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snake0ape
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Jun 07, 2013 18:58 |  #18

Thanks for posting. I think it is helpful for new 85 1.2 shooters. It gives them a measure on how narrow the DOF is at that distance and how a slight movement by the subject or shooter will get you no eyes in focus. I always tell beginners to use Al-servo to start out.


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Depth of field at wide apertures
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