What is the "magnification" or "zoom factor" of a 300 mm telephoto lens on a canon rebel xt ?
Posted by admin | Under Canon Rebel XT Body Sunday Mar 7, 2010I think you have to take in account for the "crop factor" of the camera body or something…
Both of the answers here are right and its important to note they called it a crop factor not a maginification. It is a common misconception that you get more zoom using FX lenses on a DX ( aps-c ) camera. You get no more optical magnification (when you put a 300mm lens on a DX camera you do NOT get a 480mm lens – it is still a 300mm lens) you do get the same angle of view or crop as the longer lens. This makes it seem to produce greater magnification The part of the image that fills the frame is different think of it like croppping an image on your computer screen
A good article on it is here
http://www.luminous-landscape.com/tutorials/understanding-series/dslr-mag.shtml
http://www.digitalcamerareview.com/default.asp?newsID23611
Remember crop factors are for FX lenses on a DX camera
300 X 1.6 (Canon crop factor) = 480mm (35mm equivalent)
References :
most slr’s will have something like a 1.4, 1.5 or 1.6 crop factor, due to sensors smaller than a frame of 35mm film apart from canons full frame sensors and nikons fx cameras. therefore whatever lens you have times it by the crop factor of your camera in this case 300*(1.6)
References :
photographer
Both of the answers here are right and its important to note they called it a crop factor not a maginification. It is a common misconception that you get more zoom using FX lenses on a DX ( aps-c ) camera. You get no more optical magnification (when you put a 300mm lens on a DX camera you do NOT get a 480mm lens – it is still a 300mm lens) you do get the same angle of view or crop as the longer lens. This makes it seem to produce greater magnification The part of the image that fills the frame is different think of it like croppping an image on your computer screen
A good article on it is here
http://www.luminous-landscape.com/tutorials/understanding-series/dslr-mag.shtml
http://www.digitalcamerareview.com/default.asp?newsID=3611
Remember crop factors are for FX lenses on a DX camera
References :
Zoom factor?
If you are trying to compare it to a P&S DigCam where they specify the zoom factor. It doesn’t really apply or it is a bit irrelevant to an SLR.
Assume the crop factor is 1.6x
300mm lens is 480mm (35mm equivalent)
Assume 50mm is a typical normal human view
zoom factor = 480/50 = 9.6x
otherwise
zoom factor = 300/50 = 6x
References :