11th August 2003, 09:10 PM
Equivalent DOF on Digicams
There is a focal length equivalent for digicams (depending on their CCD size). Is there an F-stop equivalent? eg. The Sony F717 only goes down to F8.0. What is this in terms of DOF and its equivalent in 35mm film camera?
11th August 2003, 11:11 PM
Take the minimum focal length of the lens in 35mm equiv (say 38mm) and divide by actual min focal length (say 9.7mm) to get the "DOF multiplier" (coined by Reflecx ). In this case, it's 3.92, so the DOF at F8 is equivalent to F31.3 in a 35mm format.
12th August 2003, 08:53 AM
What do you mean by the actual min focal length?
14th August 2003, 01:51 AM
Can we actually get ANY DOF on a prosumer digicam? I never get the blurring of the background, unless its in Macro mode, where the subject is sharp and the rest is blur...
14th August 2003, 09:51 AM
It is usually printed at the front of the lens, like 9.7mm-48mm. That means the min focal length (full wide) is 9.7mm, and the max focal length (full zoom) is 48mm. Usually the camera manufacturer will also quote the equivalent focal length in 35mm in the manual, like 38-190mm. People usually use the 35mm equivalent to compare cameras.
Originally Posted by cyke