Me and my friend are having a debate on what is the focal length of full frame lens and crop lens on crop bodies.
His point: Crop lenses are made "x1.6" to accommodate the crop sensor. while full frame lenses are "x1"
eg.tamron 17-50 (crop lens) on a 550D (crop body) would be equivalent to 17-50mm as the lens is "calibrated" for crop bodies thus the focal length stay the same. while a tamron 28-75(FF lens) on a 550D (crop body) would be equivalent to 45-120mm due to the crop sensor multiplying the focal length by 1.6x.
My point: Its not the lens that affects the "multiplication" of the focal length, its the sensor that does.
eg. tamron 17-50 (crop lens) on a 550D (crop body) would be equivalent to 27-80mm while a tamron 28-75(FF lens) on a 550D (crop body) would be equivalent to 45-120mm due to the sensor size. While a crop lens on a ff body would cause vignetting with no change in focal length(eg. tmmy 17-50 would be 17-50) while a ff lens on a ff body would have no change in focal length too(tammy 28-75 would be 28-75).
Enlighten us?? thanks lols.
His point: Crop lenses are made "x1.6" to accommodate the crop sensor. while full frame lenses are "x1"
eg.tamron 17-50 (crop lens) on a 550D (crop body) would be equivalent to 17-50mm as the lens is "calibrated" for crop bodies thus the focal length stay the same. while a tamron 28-75(FF lens) on a 550D (crop body) would be equivalent to 45-120mm due to the crop sensor multiplying the focal length by 1.6x.
My point: Its not the lens that affects the "multiplication" of the focal length, its the sensor that does.
eg. tamron 17-50 (crop lens) on a 550D (crop body) would be equivalent to 27-80mm while a tamron 28-75(FF lens) on a 550D (crop body) would be equivalent to 45-120mm due to the sensor size. While a crop lens on a ff body would cause vignetting with no change in focal length(eg. tmmy 17-50 would be 17-50) while a ff lens on a ff body would have no change in focal length too(tammy 28-75 would be 28-75).
Enlighten us?? thanks lols.