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Thread started 11 Feb 2009 (Wednesday) 07:38

# Is there a formula?

Feb 12, 2009 01:41 as a reply to  @ post 7308951 |  #31

All kidding aside, there are times when people or even you as well want to know how far something was taken from. Lets say in terms of telephotography.
There is actualy a simple formula that everyone can use to figure out the distance a photo was taken.
As an example we take a simple setup where a man is standing and photographed landscape with a 135mm lens on a full frame body.

The formula is DISTANCE equals HEIGHT(subject) devided bij the TANGENS of the VERTICAL OPTICAL ANGEL.

We know the persons height (1,8m)
We know the vertical optical angel (for a 135mm lens = 10° - see Canon documentation)
We know the tangens of this 10° (windows calculator says 0,176326981)
Sollution : 1,8 / 0,176326981 = 10,2 meter

So in order to have a standing man full frame on, lets say a 5d(II) body with a 135mm lens we need to be 10,2 meters away. As simple as that.

For a crop sensor you need to change the lens setting but the priciple is the same. The same thing for feet lovers.

Hope this is making any sense. Good luck and greetings from Ghent.

Alain,

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Feb 12, 2009 01:59 |  #32

No no, who's on 2nd; he's on 3rd...

Always check the background first
flickr.com/photos/pete​ssnaps

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Feb 12, 2009 07:53 |  #33

But it is only a fuzzy bunny!!!!!

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Feb 12, 2009 08:35 |  #34

Canon XSi | 18-55 IS | 85/1.8 | Manfrotto 790B

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Feb 12, 2009 11:36 |  #35

I still want to know why

Kev

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Feb 12, 2009 11:43 |  #36

NinetyEight wrote in post #7311184
I still want to know why

He's in left

-Dan
Canon 40d, 28-135 IS, 70-300 IS, 100-400L IS, Sigma 10-20, 430exII
My Flickr

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Feb 12, 2009 13:33 |  #37

Lenty007 wrote in post #7309013
All kidding aside, there are times when people or even you as well want to know how far something was taken from. Lets say in terms of telephotography.
There is actualy a simple formula that everyone can use to figure out the distance a photo was taken.
As an example we take a simple setup where a man is standing and photographed landscape with a 135mm lens on a full frame body.

The formula is DISTANCE equals HEIGHT(subject) devided bij the TANGENS of the VERTICAL OPTICAL ANGEL.

We know the persons height (1,8m)
We know the vertical optical angel (for a 135mm lens = 10° - see Canon documentation)
We know the tangens of this 10° (windows calculator says 0,176326981)
Sollution : 1,8 / 0,176326981 = 10,2 meter

So in order to have a standing man full frame on, lets say a 5d(II) body with a 135mm lens we need to be 10,2 meters away. As simple as that.

For a crop sensor you need to change the lens setting but the priciple is the same. The same thing for feet lovers.

Hope this is making any sense. Good luck and greetings from Ghent.

Alain,

edit

EOS 50D | 17-55 f/2.8 IS | 70-200 f/2.8 IS L | 100mm f/2.8 macro | 580EX | 430 EX | 430 EZ | Team Buff!!

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Feb 13, 2009 00:02 as a reply to  @ Lenty007's post |  #38

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Feb 13, 2009 16:35 |  #39

number six wrote in post #7308833
No ****, Sherlock!!!

Bet you weren't a math major.

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Feb 13, 2009 16:44 |  #40

pratman64 wrote in post #7319933
Bet you weren't a math major.

Ummm, afraid I was. BA in math from CSUSF.

"Be seeing you."
50D - 17-55 f/2.8 IS - 18-55 IS - 28-105 II USM - 60 f/2.8 macro - 70-200 f/4 L - Sigma flash
I do not piddle on the carpet!

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Feb 13, 2009 17:24 |  #41

number six wrote in post #7319964
Ummm, afraid I was. BA in math from CSUSF.

Maths is an art in California? Over here it's a science!

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Feb 13, 2009 17:25 |  #42

Over here, it's a...math.

Avoiding monkeys will probably solve your problem.

Canon XSi | 18-55 IS | 85/1.8 | Manfrotto 790B

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Feb 13, 2009 17:53 |  #43

xarqi wrote in post #7320181
Maths is an art in California? Over here it's a science!

I, Sire, am an artiste!

Nah, BA or BS was simply a matter of which elective courses I chose. I took some language, philosophy and lit electives so I got a BA. Took a semester longer than a BS, but I enjoyed it at the time...

-js

"Be seeing you."
50D - 17-55 f/2.8 IS - 18-55 IS - 28-105 II USM - 60 f/2.8 macro - 70-200 f/4 L - Sigma flash
I do not piddle on the carpet!

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Is there a formula?
AAA
 x 1600 y 1600

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