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CT · 18-08-2005, 16:06

I don't see that the 1.6X factor has any effect on shutter speed...does it?

The focal length of the lens is still actually exactly the same. A 500mm lens on a 1.6X sensor is till the same focal length as on a 1:1 sensor (or 35mm film). Contrary to popular belief there is no magnification involved - the 1.6X isn't a magnification - it's a crop.

The often quoted 'gain' with tele lenses is just down to the fact that exactly the same size image hits the sensor as it would with film, but on a much smaller area, therefore giving the equivalent (much tighter) field of view as a lens 1.6X longer on a 1:1 sensor or 35mm film.

I know it makes your head hurt thinking about this stuff.

18-08-2005, 16:06	#6 (permalink)
CT Feet under the table Join Date: Mar 2005 Location: West Mids UK Posts: 3,500	I don't see that the 1.6X factor has any effect on shutter speed...does it? The focal length of the lens is still actually exactly the same. A 500mm lens on a 1.6X sensor is till the same focal length as on a 1:1 sensor (or 35mm film). Contrary to popular belief there is no magnification involved - the 1.6X isn't a magnification - it's a crop. The often quoted 'gain' with tele lenses is just down to the fact that exactly the same size image hits the sensor as it would with film, but on a much smaller area, therefore giving the equivalent (much tighter) field of view as a lens 1.6X longer on a 1:1 sensor or 35mm film. I know it makes your head hurt thinking about this stuff.