Animal Eye AF

Started 3 months ago | Questions thread
tbcass
tbcass Forum Pro • Posts: 43,479
Re: Animal Eye AF
1

Chikubi wrote:

At 50ft, with a FF camera and a 200mm lens, at f/2.8 you have just over 3ft of DOF available to you. (https://www.dofmaster.com/dofjs.html) This is a pretty typical distance for that kind of focal length usage, so are you telling me that that's not enough to keep a dog, cat, bird, squirrel, etc. in focus? Again, I'm sure if you search you'll be able to find plenty of examples of acceptable photos at pretty much any distance/focal length combo you like.

Most DOF calculators use small 8x10 print as their basis of comparison. That calculator is useless because it fails to take into account print size, viewer eyesight and viewing distance. The following DOF calculator takes all those into consideration in the advanced mode. For a print with a maximum linear dimension of 20 inches, viewing distance of 25cm, 20/20 eyesight, FF camera, 200mm f2.8 the DOF is only about 7 inches.

https://www.cambridgeincolour.com/tutorials/dof-calculator.htm

The rest of your post assumes I care about eye AF. I do not, have no use for it and do not own a camera that has it. I am broad minded enough to see where many other people will find it a useful feature.

What I fail to understand is why people like you always seem to dismiss new features and capabilities every time one comes around.

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Tom

 tbcass's gear list:tbcass's gear list
Sony RX100 Sony RX10 IV Sony a99 II Tamron SP AF 90mm F/2.8 Di Macro Sony DT 35mm F1.8 SAM +10 more
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