Table for x zoom and mm

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Angchuk@gmail.com - 22 Nov 2006 10:05 GMT

Hi,

Where can I find a table which translate the x zoom to equivalent mm
for lens.

Say if a camera is 3x zoom
what is the lens in mm

Thanks
Angchuk

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Richard Polhill - 22 Nov 2006 11:35 GMT

> Hi,
>
[quoted text clipped - 6 lines]
> Thanks
> Angchuk

3x zoom is the ratio of the long end of the zoom to the short end and has no
absolute value.

Eg.: a 70-210mm zoom is 3x, an 18-108mm zoom is 6x.

Focal length (usually described in mm, but also in inches) is the distance
between the optical centre of the lens and the focal point when focussed at
infinity.

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bstephens1ster@gmail.com - 14 Dec 2006 00:25 GMT

Each P&S camera is probably different, but, I would guess that the
typical 3x zoom is probably the equivilent ( for 35mm) of approx. a
30-90mm range ?
-Bob

> Hi,
>
[quoted text clipped - 6 lines]
> Thanks
> Angchuk

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madhobbit.geo@yahoo.com - 14 Dec 2006 22:46 GMT

> Hi,
>
[quoted text clipped - 3 lines]
> Say if a camera is 3x zoom
> what is the lens in mm

There's no way to convert the two - it'll depend on the camera. Check a
decent review site (like dpreview.com) for specifics on any particular
camera you're interested in.

Looking at:
http://www.dpreview.com/reviews/specs/Canon/
http://www.dpreview.com/reviews/specs/Fujifilm/
http://www.dpreview.com/reviews/specs/Casio/
for summaries, we can see:
Canon PowerShot SD630: 3x zoom, 35-105 mm equiv.
Fujifilm FinePix F20 Zoom : 3x zoom, 36-108 mm equiv.
Canon PowerShot SD900: 3x zoom, 37-111 mm equiv.
Fujifilm FinePix A500 Zoom: 3x zoom, 38-114 mm equiv.
Casio QV-R62: 3x zoom, 39-117 mm equiv.

They're in the same general ballpark, but "3x" just means that the
longer focal length is three times the smaller focal length. The
Powershot SD630 clearly has a wider field of view than the Casio QV-R62
does.

- Darryl

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