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Re: [OM] OM macro / closeups vs medium format / TLR

Subject: Re: [OM] OM macro / closeups vs medium format / TLR
From: "John A. Lind" <jlind@xxxxxxxxxxxx>
Date: Fri, 04 Jan 2002 00:19:09 +0000
At 13:45 1/3/02, Frieder Faig wrote (in part):
Good site. Must have been lot of work. I like it.

Thank you.
Some of it was easy and other parts took some work (the graphics).

To be very accurate. Ouer opinions are not opposed to each other. You`ve chosen 1:10 magnification to demonstrate that dof remains practicaly the same. This is true, but only with high magnification like you used.

I´vs found a ugly hyperbola curve for dof depending on focal length. I´ve some graphics too. have a lock at:

http://studweb.studserv.uni-stuttgart.de/studweb/users/mas/mas12462/Optik/dof_considerations.html

oh, oh, the urls are getting longer and longer...

Frieder Faig

Yes . . . back to my own spreadsheets . . . I need to "mentally masticate" this for a while and run more sets of conditions (magnifications and apertures). An extreme end of one of my own graphs may have given a hint of the hyperbola you mention.

Surprised you didn't mention my page is missing the equations that were used. Thought about that after I uploaded it. I should have put them on the page (so anyone can replicate the graphs).

-- John


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