Jump to content


Photo

Magnification ratio equation


  • Please log in to reply
2 replies to this topic

#1 Daniel Miler

Daniel Miler
  • Basic Members
  • PipPip
  • 35 posts
  • Cinematographer
  • Tel Aviv, Israel

Posted 30 April 2016 - 08:20 AM

Hello all

 

Beware, a hardcore technical question ahead....

 

I know that by having the focal length and minimum focus distance of a given lens, plus the sensor size, one can calculate the magnification ratio of that lens, such as with this very useful online calculator.

 

However, I don't want to have to rely on an online calculator, and have been frantically searching for the equation that will enable me to calculate this on my own, to no avail. 

 

I have been spending the last day drowning in technical terminology and trying to make sense of it, just to understand how very simply focal length + minimum focus + sensor size = magnification ratio...

Shouldn't be that complicated...

 

Any Ideas fellow geekster cinematographers?

 

Thanks 

 

 

 


  • 0

#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 20182 posts
  • Cinematographer
  • Los Angeles

Posted 30 April 2016 - 10:48 AM

The same site you listed gives you the math behind the calculations for magnification here:

http://www.kielia.de.../magnification/

 

As it points out, sensor size has no bearing on magnification ratio of a lens.


  • 0

#3 Daniel Miler

Daniel Miler
  • Basic Members
  • PipPip
  • 35 posts
  • Cinematographer
  • Tel Aviv, Israel

Posted 02 May 2016 - 03:17 PM

Hi David thanks for your quick reply

 

However, there is still way too much algebra in there for me to figure out, as in all the equations I see online they go into image distance and object distance and other comlex terms. 

 

Im trying to find a straightforward formula where I only need to put in focal lenght and focusing distance...


  • 0


Willys Widgets

Broadcast Solutions Inc

Technodolly

Abel Cine

CineLab

Media Blackout - Custom Cables and AKS

Rig Wheels Passport

Wooden Camera

rebotnix Technologies

Ritter Battery

FJS International, LLC

CineTape

Gamma Ray Digital Inc

Aerial Filmworks

Glidecam

Tai Audio

The Slider

Paralinx LLC

New Pro Video - New and Used Equipment

Metropolis Post

Visual Products

Visual Products

CineTape

Gamma Ray Digital Inc

Paralinx LLC

Abel Cine

Aerial Filmworks

Willys Widgets

FJS International, LLC

Metropolis Post

Broadcast Solutions Inc

CineLab

Tai Audio

Ritter Battery

New Pro Video - New and Used Equipment

rebotnix Technologies

Rig Wheels Passport

Wooden Camera

The Slider

Glidecam

Media Blackout - Custom Cables and AKS

Technodolly