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## #1 2014-05-15 02:44:56

DaveRobinsonUK1
Member
Registered: 2011-12-01
Posts: 12

### Inverse Function

Hi All

I have come across this problem and it's giving me some jip.

I have a function

I would like to be able to put in the field of view and then solve for the focal length. Is this possible, what with
there being 2 internal variables?

Many thanks in advance.

David

I see it, but I don't believe it.

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## #2 2014-05-15 04:17:27

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,015

### Re: Inverse Function

Not without knowing 'width' too.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #3 2014-05-15 05:25:53

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 103,709

### Re: Inverse Function

Hi;

You can solve for it but there will still be one more variable.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

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