DOF guide numbers for telephoto lenses | Nikon Cafe

We rely on revenue from ads to pay the bills. Please support our efforts by allowing the ads to show on the Nikon Cafe. Alternatively, consider becoming a site subscriber for $10 per year to remove all ads.

Recently Flew pm'd me with a back of the envelope figure of depth of field for a particular lens. It occurred to me that I had no idea how he got that. Is there some source on how to go about finding/calculating these figures? Now that I'm shooting more birds and can see the distance on the lens to the subject and the aperture it would be nice to have some cheat cheet...or handy formula...nah, make that a cheat sheet to see what DOF I can expect on the bird. I know I'm not allowing enough right now.

Excellent Phil. Thanks; that was quick. Even stupid questions are answered in this place! Is the Cafe great or what? And the moderators, not only good looking, but smart....well, some of them!

Rich, if you want to know more, download this small calculator (550k)from DL&C. You can use the calculator directly or, after reading the help file, construct a spreadsheet or perhaps enter the equations in your pocket calculator. Or, you can construct your own cheat sheet for selected lenses.

Rich, if you want to know more, download this small calculator (550k)from DL&C. You can use the calculator directly or, after reading the help file, construct a spreadsheet or perhaps enter the equations in your pocket calculator. Or, you can construct your own cheat sheet for selected lenses.

You might want to also check http://www.tangentsoft.net for a small program called f/calc. It has dof, hyper focal distance, field of view, angle of view, magnification and f stops. It is freeware, nice little program. Good luck, Bill

Flew made his own (I think) in Excel, and if I can dig it up it has graphs and other cool things...so if you are still looking for one shoot me a PM, and I'm sure I can find it somewhere.

This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.