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Thread started 22 Aug 2014 (Friday) 05:00

FL/distance/magnification calculation

Aug 22, 2014 05:00 |  #1

Hi

I'm looking for an online calculator where, for a certain camera format (in this case 35mm FF but it could vary) I can put two of the three parameters (magnification/FL/dist​ance) and get the remaining one. Obvioulsy it is approximate because of specific issues of each lens (e.g. focus breathing) but that's fine.

Thanks

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Aug 22, 2014 09:17 |  #2

I think this will do what you're after

http://www.mystd.de/al​bum/calculator/

James

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Aug 22, 2014 09:21 |  #3

clarnibass wrote in post #17110893
Hi

I'm looking for an online calculator where, for a certain camera format (in this case 35mm FF but it could vary) I can put two of the three parameters (magnification/FL/dist​ance) and get the remaining one. Obvioulsy it is approximate because of specific issues of each lens (e.g. focus breathing) but that's fine.

Thanks

Are you considering macro (very close in) photography or photography with the subject at normal everyday distances? The magnification variable generally is not considered for normal distances.

Skip Douglas
A few cameras and over 50 years behind them .....
..... but still learning all the time.

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Aug 23, 2014 01:04 |  #4

To clarify, what I'm interested in is that if I see a photo, know the sensor size, FL and magnification, I want to calculate the distance. I realize this can vary by focus breathing and maybe other things, so I know it's only approximate and that's fine.

I couldn't find how to do that in the calculator posted in the first reply.

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Aug 23, 2014 06:07 |  #5

clarnibass wrote in post #17112658
To clarify, what I'm interested in is that if I see a photo, know the sensor size, FL and magnification, I want to calculate the distance. I realize this can vary by focus breathing and maybe other things, so I know it's only approximate and that's fine.

This page of photographic calculators may be handy. However, I've never seen "magnification" used at normal camera-subject distances.

You might want to create or adapt a calculator to use a known subject size vs percentage of height in the viewfinder, for example.

Skip Douglas
A few cameras and over 50 years behind them .....
..... but still learning all the time.

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FL/distance/magnification calculation
AAA
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