UKC

Can someone sum up the equation here for me please:

If a 24-105mm lens on a full-frame sensor has a true 24-105mm range...

...but on an APS-C (1.6) it's equivalent to 39-168mm on a full-frame...

...does it mean you need a 17mm to get a 'real' wide lens on a 1.6 sensor?

Thanks

In reply to Cerulean:

A 24mm lens is a 24mm lens whatever camera you put it on.

The "magnification factor" is a misnomer when talking about 35mm-FullFrame and 1.6x factor DSLR, it's all to do field of view equivalence.

http://www.luminous-landscape.com/tutorials/understanding-series/dslr-mag.s...

So a 15mm lens on a 1.6 factor camera will give the same field-of-view as a 24mm lens on a 35mm-FullFrame camera (1.6 x 15mm = 24mm).

It does not magnify the image or make the 15mm magically become a 24mm lens.

Hope this helps.

In reply to Cerulean: Sigma 10-20 'becomes' a 16-32 equivalent when its mounted on a 1.6 body. Seeing as this is the widest you can get without going fisheye, you can see why full frame owners like Chris are probably looking smug, while we confuse ourself with calculations.

So yes....17 'becomes' 24

In reply to ChrisJD:

Yeah thanks, that's how I see it. I just needed a 'calculator' in my head so I'd know what field of view I was getting on a 1.6 DLSR.

'Times by 1.6' will do for me choosing lenses. Cheers

In reply to Cerulean:

but with some Canon's it's 1.3
with Nikon's it's 1.5
with Olympus it's 2.0

and other cameras vary too...

In reply to Ian Hill:

Yes I've read that. I have my eye on a 1.6 camera though.