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

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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**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,219

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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