Please a little help with DOF of 25/1.4 vs. 45/1.8 ??

Started Feb 22, 2012 | Discussions thread
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In reply to Jeff, Feb 23, 2012

Jeff wrote:

Very short clip, but really demonstrates what happens if maintain the image size and f/number constant as you change the focal length of the lens.

http://www.youtube.com/watch?v=Z0t_HU9WwkU&feature=related

They use that effect on TV sometimes during a "dramatic moment". It's important to distinguish between DOF and blur, and understand the role perspective plays in photography (the whole "zoom with your feet" argument).

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