Question about DX Lenses

DX means that the lens will only cover an APSC sensor. If you put this lens on a full frame camera the corners of the frame would be dark.

This lens will behave in the same way a full frame lens does. So the field of view with a 35mm on a DX camera will be equip agent to a 52.5mm lens on a full frame camera(35 x 1.5)
 
The focal length is what it is (in this case, 35mm). It's a property of the lens and doesn't change no matter what's in front or behind it.
The field of view of a 35mm on an APS-C camera will be the same as the field of view of a 53mm on FF.

More here.
 
Samuel H said:
The focal length is what it is (in this case, 35mm). It's a property of the lens and doesn't change no matter what's in front or behind it.
The field of view of a 35mm on an APS-C camera will be the same as the field of view of a 53mm on FF.

More here.
Click to expand...

I don't know, since I've not checked prices and f-stops, but I think it is cheaper to make a DX (or any other 'smaller area' imaging device...) lens that has a larger max effective F-stop. (Alternatively, DX lenses can be made more cheaply than the full frame lens at the same max f-stop...).

If I understand how these 'speed booster' devices work, they are on the same principle.
 
Speedboosters work by focusing the light from the lens onto a smaller area (in this case a smaller sensor). Same number of photons crammed into a smaller space means "more light" on the sensor. The technology itself has nothing to do with how big the glass on a DX lens is. though I imagine a DX to full frame booster might be pricier.
 
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