Next to this text you see the 50mm and 35mm DX. Both
lenses are standard lenses voor the FX and de DX. They are
cheap. Nice to know is, that both lenses can be uses on both
cameras!
With the DX the 35mm will give you the standard view,
almost like the human eye. When you would buy a 50mm FX
too, then that would be a nice sort of telelens: 75mm, very
good for portraits for instance and you would have two very
fast lenses, both f1.8.
But.... you can also use de 35mm DX on an FX camera. I know
with Nikon the camera switches the FX sensor to a DX one
when it detects a DX lens. But you can turn that off in the
menu. When you do, you can use the 35mm lens as a wideangle
lens. Till up to f8 this gives nice images, tho the corners
of the photo are a bit dark. You can solve this in
Photoshop with filter / lenscorrection, with which you can
remove the vignetting.
When you buy an FX 35mm f1.8 it will cost you a lot of
money, while this lens is just as good en far cheaper.
Like they say: If it ain't Dutch, it ain't much.... We
always find a way to save us some money :-) Why wouldn't
you? Even when you are not Dutch?
If you like to read more about this and see more examples, you
could have a look at
PhotographyLife. They even compare the 35mm to a real FX
lens.
There is more to read on the site of
Thomas Fitzgerald. So if you have an FX body and a 35mm
DX lying around somewhere.... give it a try.