I think you need the angle of view more than field of view.  the formula 
for AOV is

AOF = 2*tan^(-1)/(F/2*f) where F is the size of the sensor f is the 
focal length.  You'll have to use some algebra to rearrange the terms to 
solve for "f".  I'm just feeling too lazy...

Shel Belinkoff wrote:
> There is a photo I'd like to make, but the widest lens I have is still too
> long as it forces me to include an undesirable object in the frame and I
> don't want to mess around with cloning the object out of the scene.  I will
> need to borrow a wider lens, but I don't know what focal length would work.
> Is there a way to determine the focal length I need based on the subject
> distance and framing I want using the longer lens.  I know how close I must
> get to the subject to eliminate the unwanted element.  Perhaps a formula of
> some sort?
>
> For what it's worth, the subject is about 12-feet long and I have to get
> about six feet from it.
>
>
> Shel
>
>
>
>
>   


-- 
Things should be made as simple as possible -- but no simpler.
                        --Albert Einstein



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