Leica User Forum - View Single Post - Tech question about DOF

jaapv · 05/05/08, 03:25 PM

I will be happy to be corrected if I am wrong,it is becoming a bit abtruse, but numerical f-stop I think means calculated f-stop, as opposed to the one indicated by the f-scale. So it should be actual lens diameter divided by real (=extended) focal length. The f=extended focal length in that formula afaik.

05/05/08, 03:25 PM	#16 (permalink)
jaapv Erfahrener Benutzer Join Date: 09/14/04 Location: Hellevoetsluis, Netherlands Posts: 5,688	Re: Tech question about DOF - macro environment I will be happy to be corrected if I am wrong,it is becoming a bit abtruse, but numerical f-stop I think means calculated f-stop, as opposed to the one indicated by the f-scale. So it should be actual lens diameter divided by real (=extended) focal length. The f=extended focal length in that formula afaik. __________________ Jaap WWW.JAAPVPHOTOGRAPHY.EU Last edited by jaapv : 05/05/08 at 03:34 PM.