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Anonymous
Quick question about conversion for lenses on digital cameras. I know for Nikon the magnification is about 1.5, so a 50mm is really a 75mm, but why is that? and does it occur if I toss my manual lens onto the digital body?
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it occurs with no matter what lens you put on the camera.

that INCLUDES! nikon's DX and canon's EF-s. though they say they are 17-85 or 18-55 they still require the focal conversion the same way as any other lens.
that means that, even tough its a dedicated EF-s/DX lens, that 17-85 is now a 28-135 FF equiv and things like the 24-70L are a ~38-112mm.

note that i used canon lenses and conversion but its similar for nikon too.

the reason it occurs is because the sensor on crop cameras is smaller so you ar essentially cropping a section of the image which creates the essentially longer focal length.
now with EF-s/DX lenses they purposely are designed to create the smaller image circle to only cover the crop sensor and so if you manage to fit one on a FF camera and use it w/out damaging the camera you will have large black areas around the outside of the picture due to the smaller image circle not covering it properly.

hope that helps
>> Anonymous
>>11872024-70L are a ~38-112mm

it just means that the area that the camera senses is equivalent to the are taken by a 38-112, but it doesn't necessarily mean that it "zooms" or magnifies the image to 38-112, right? It's just like a regular 18mm, but the sides cropped off?
>> ac !!VPzQAxYPAMA
>>118722
True. The camera itself doesn't add any magnification. The magnification happens because you enlarge the picture to the same size that you would if it were a 35mm frame.