aperture and DOF and format

[reaction]

I know that APS and 35mm are said to have different DOF. I know why FX has less DOF than DX.

Is there a way to say that a pic taken with a f/ value in FX would have the same DOF as what f/ in DX? :o

[ricktas]

it is all mathematics. There is probably a calculator available that can do this.

The issue is that not all crop sensors are the same. Some are 1.4. 1.5 or 1.6 crops, and then you have the 4/3rd system and now micro 4/3rds. This is without considering the compacts and their sensors. Any calculation needs to be based on the crop factor of any particular cameras sensor.

[I @ M]

If you have a look at this on line depth of field calculator (http://www.dofmaster.com/dofjs.html) you can enter differing camera ( FX or Dx ) formats, makes and models to show you the resulting depth of field at varying apertures.

[reaction]

Just read an article that clears this up. 1.5crop at 3.5 is same as FX at 5.6!
That's just crazy, now I know why some insist on FX, hmm. :party6: