Archived posting to the Leica Users Group, 2000/05/18

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: Re: [Leica] "Quick" DOF calculation
From: Johnny Deadman <>
Date: Thu, 18 May 2000 12:50:40 +0100

on 17/5/00 10:24 pm, Mark Rabiner at wrote:

>> Step 1. find Circle of Confusion for lens: CC= 1000/FL (use FL expressed in
>> mm, not inches or cm)
>> Step 2. find Hyperfocal Distance: HD=(12xf)/(FLxFL)x(CC/1)
>> Step 3. find the nearest DOF point: NP=(HD+FD)/(HDxFD)
>> Step 4. find the farthest DOF point: FP=(HD-FD)/(HDxFD)
>> Yes, it's that easy. Who needs those modern DOF scale gadgets!
>> :-)
>> Carpe Lumen,
>> Michael E. Berube
> FUNNY!!!!!!!
> Mark Rabiner
> call me Spock!

Actually, I have a tiny Excel spreadsheet that I made to use exactly this
formula. Works great! Like, for streetshooting, I can figure out just how
good my guesstimating has to be on the 35 wide open at ten feet... something
you definitely CAN'T do from a DOF scale.

- --
Johnny Deadman


Replies: Reply from Mark Rabiner <> (Re: [Leica] "Quick" DOF calculation)