Comments on: Focal length for the common man: “portrait distance” http://blog.forret.com/2010/02/focal-length-for-the-common-man-portrait-distance/ Tango, photography and whatever's bleeding edge Thu, 27 Oct 2011 14:28:42 +0000 hourly 1 http://wordpress.org/?v=3.1.4 By: Peter http://blog.forret.com/2010/02/focal-length-for-the-common-man-portrait-distance/comment-page-1/#comment-488692 Peter Sat, 31 Jul 2010 10:02:48 +0000 http://blog.forret.com/?p=1156#comment-488692 The depth of field would be different. Check with http://www.hdslr-cinema.com/tools/dof.php Imagine you take a picture of someone at 4m distance, with aperture f/2.8 1) with a 70mm lens you get a depth of field of 54cm. If you crop to have only the face: still 54cm. So the whole face (eyes, ears, hair) will probably be sharp. 2) with a 200mm lens, you get a depth of field of 6cm. So if the eyes are in focus, the ears might already be blurry a bit. The depth of field would be different.
Check with http://www.hdslr-cinema.com/tools/dof.php

Imagine you take a picture of someone at 4m distance, with aperture f/2.8
1) with a 70mm lens you get a depth of field of 54cm. If you crop to have only the face: still 54cm. So the whole face (eyes, ears, hair) will probably be sharp.
2) with a 200mm lens, you get a depth of field of 6cm. So if the eyes are in focus, the ears might already be blurry a bit.

]]> By: Daniel http://blog.forret.com/2010/02/focal-length-for-the-common-man-portrait-distance/comment-page-1/#comment-488685 Daniel Sat, 31 Jul 2010 09:40:42 +0000 http://blog.forret.com/?p=1156#comment-488685 Peter, a related question: Basically with 18MP+ you could just crop the image to portrait "size"; does the focal length affect the image in any other way, too? Or is it just the "detail" that you would lose? Peter, a related question:
Basically with 18MP+ you could just crop the image to portrait “size”; does the focal length affect the image in any other way, too? Or is it just the “detail” that you would lose?

]]> By: Bookmarks for April 26th through April 27th | dekay.org http://blog.forret.com/2010/02/focal-length-for-the-common-man-portrait-distance/comment-page-1/#comment-466448 Bookmarks for April 26th through April 27th | dekay.org Tue, 27 Apr 2010 11:06:31 +0000 http://blog.forret.com/?p=1156#comment-466448 [...] Focal length for the common man: “portrait distance” | blog.forret.com – (tags: focal length Photography ) [...] [...] Focal length for the common man: “portrait distance” | blog.forret.com – (tags: focal length Photography ) [...]

]]> By: Tweets that mention Focal length for the common man: “portrait distance” | blog.forret.com -- Topsy.com http://blog.forret.com/2010/02/focal-length-for-the-common-man-portrait-distance/comment-page-1/#comment-446167 Tweets that mention Focal length for the common man: “portrait distance” | blog.forret.com -- Topsy.com Thu, 04 Feb 2010 13:57:42 +0000 http://blog.forret.com/?p=1156#comment-446167 [...] This post was mentioned on Twitter by Alex Deforce, binarycamera. binarycamera said: Focal length for the common man: a oeportrait distancea: I remember that before I started photography on a serious... http://bit.ly/9er4xD [...] [...] This post was mentioned on Twitter by Alex Deforce, binarycamera. binarycamera said: Focal length for the common man: a oeportrait distancea: I remember that before I started photography on a serious… http://bit.ly/9er4xD [...]

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