# Effect on dimensions of image, wider lenses

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### #1 Peter Smuts

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Posted 09 April 2013 - 10:49 AM

I've a question with regard to the effect of using widers lenses.

If you consider the left-right of your frame as the x axis, and bottom-top as the y axis,

Does your field of view increase in equal amounts for both x and y when you use wider lenses?

Or do you gain more on the x axis than you do on the y?

Many thanks in advance

Peter.

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### #2 Stuart Brereton

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Posted 10 April 2013 - 11:48 AM

The field of view does not increase by equal amounts on both axes, but increases to maintain the same aspect ratio

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### #3 Chris Millar

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Posted 10 April 2013 - 04:34 PM

Firstly we need to determine if by 'increase' you mean by a multiplicative constant or a additive constant. Additive would be weird and as Stuart points out yes, multiplicative is the 'correct' way to think about it. (or is it... read on...)

Although, looking through some very wide lenses I do wonder if the distribution of 'wideness' (correct terms someone?) does actually hold constant - some lenses seem to be push a lot of information into the centre of the image and then go crazy stretchy at the extremes - i.e. a non-constant distribution. Therefore, your long (usually) horizontal aspect sees a wider-wider image (as opposed to just wider).

Did I just ask your same question in a different way?

Obviously all I have to add here is confusion

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