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 6th of September 2002 (Fri) #1 dfleming Junior Member   Join Date: Mar 2002 Posts: 13 hyperfocal distance for g2 A shortcut for calculating hyperfocal distance for 35mm format (explained in the popphoto.com forums a few days ago) got me thinking about developing a shortcut for the G2. The approximate hyperfocal distance (in feet) for the Canon G2 lens, set to f/5.6: H = (f*f)/10 or, the focal length squared divided by 10. (Note that this shortcut will work for any digital camera for which the circle of confusion is 0.006 mm, which includes the A40, S30, S40, G1, Pro 90 IS). Because the focal lengths for the G2 zoom lens are short, the math is easy to do: 7mm lens: H = 7*7/10 = 4.9 feet 8mm lens: H = 8*8/10 = 6.4 feet 10mm lens: H = 10*10/10 = 10 feet 20mm lens: H = 20*20/10 = 40 feet These numbers are close enough for any work in the field. The actual numbers for f/5.6, calculated using the DOFMaster calculators ( http://www.dofmaster.com ), are: 7mm lens: H = 4.8 feet 8mm lens: H = 6.2 feet 10mm lens: H = 9.7 feet 20mm lens: H = 39 feet I've also updated an article ( http://www.dofmaster.com/hyperfocal.html ) that gives practical advice about using hyperfocal distance in the field. Derivation: The shortcut is based on using 0.006mm for the circle of confusion. The derivation of the shortcut from the hyperfocal distance equation follows: H = (f*f)/(N*c*304.8) where H = hyperfocal distance in feet N = f-number c = circle of confusion and 304.8 is the conversion from millimeters to feet When N=5.6 and c=0.006, the denominator is: 5.6*0.006*304.8 = 10.24 And without causing any significant error, we can just say the denominator equals 10. Thus, the hyperfocal distance equation becomes: H = (f*f)/10 Don
 8th of September 2002 (Sun) #2 Leighow Goldmember   Join Date: Jan 2002 Posts: 2,844 Re: hyperfocal distance for g2 DON I will keep it short. I had not appreciated this relationship even though in 1958 I took a half-semester course in thick and thin optics. Very thorough. Very professional. Very useful. Your approach (given a specific setting) can help "gut feel" photographers such as myself to take more effective photographs. Excellent. I will study and apply. Thank you very much. HOWIE
 8th of October 2002 (Tue) #3 G2Brooklyn Junior Member   Join Date: Sep 2002 Posts: 6 Re: hyperfocal distance for g2 This link is dead. http://www.dofmaster.com/hyperfocal.html Could you please bring it back to life. I need the information that it holds. The Sponge
 9th of October 2002 (Wed) #4 dfleming Junior Member   Join Date: Mar 2002 Posts: 13 Re: hyperfocal distance for g2 The site was down for a period of time yesterday. It's back up today, so the link should work. Don

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