Depth of field

jbenenson · 4th of June 2003 (Wed)

Hi,

I was surprised to learn (through the forum) that the G3's minimum aperture is f8. Being new to digital cameras (the G3 is my first), I was wondering how this affects the depth of field. I know that the lens focal lengths are expressed in "35mm equivalents" and the aperture is a ratio of the actual focal length, so is there an equivalent 35mm minimum aperture, or is f8 really the minimum? If that's the case, then depth of field is really limited IMHO.

JamesC · 5th of June 2003 (Thu)

f8 may seem a relatively large minimum aperture, especially compared to f22 on 35 mm lenses, but the thing to remember is that it is the actual focal length, not the '35 mm equivalent' that determines the depth of field. So the G3, with its short actual focal lengths, usually has massive depth of field (sometimes almost too much: I really like throwing backgrounds out of focus, and it can be difficult with the G3).

See http://dfleming.ameranet.com/dofjs.html for a useful depth of field calculator.

jboyd · 5th of June 2003 (Thu)

check out this article on depth of field. You may find you like the website, too!

http://canong2.dynip.com:8080/canon-...rticle28.shtml

Jackie

4th of June 2003 (Wed)	#1
jbenenson Junior Member Join Date: Jun 2003 Posts: 7	Depth of field Hi, I was surprised to learn (through the forum) that the G3's minimum aperture is f8. Being new to digital cameras (the G3 is my first), I was wondering how this affects the depth of field. I know that the lens focal lengths are expressed in "35mm equivalents" and the aperture is a ratio of the actual focal length, so is there an equivalent 35mm minimum aperture, or is f8 really the minimum? If that's the case, then depth of field is really limited IMHO.

5th of June 2003 (Thu)	#2
JamesC Junior Member Join Date: Apr 2003 Location: Edinburgh, Scotland Posts: 19	Re: Depth of field f8 may seem a relatively large minimum aperture, especially compared to f22 on 35 mm lenses, but the thing to remember is that it is the actual focal length, not the '35 mm equivalent' that determines the depth of field. So the G3, with its short actual focal lengths, usually has massive depth of field (sometimes almost too much: I really like throwing backgrounds out of focus, and it can be difficult with the G3). See http://dfleming.ameranet.com/dofjs.html for a useful depth of field calculator. __________________ G3, 420ex, Tiffen wide and tele converters

5th of June 2003 (Thu)	#3
jboyd Member Join Date: Mar 2003 Location: Kimberly, WI Posts: 331 IMAGE EDITING OK	Re: Depth of field check out this article on depth of field. You may find you like the website, too! http://canong2.dynip.com:8080/canon-...rticle28.shtml Jackie __________________ Jackie Boyd 40D \| 20D \| 10D \| 16-35 f/2.8L \| 24-70 f/2.8L \| 70-200 f/4L \| 85 f/1.8 \| 50 f/1.8 \| Tamron 90 f/2.8macro \| Tamron 28-75 f/2.8 XR Di LD \| 550EX \| AlienBee 800's \| and too many other accessories!

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