why they don't make ef-s lenses an ef lenses

hello
i hope that canon make these two lenses an ef not only ef-s lenses
18-55
55-250
i like these lenses for the price and for the light weight and want to use them on FF bodies like the 6D or the 5D3
what do you think ?
an expensive body with some cheap lenses
I think they will give us a nice photos on the full frame body

why then they made the 50mm f/1.8 an ef lens for the crop and for the FF ?

or even better, an iphone lens mounted to a 5D3......nice and light

pixelbasher wrote in post #16774525
or even better, an iphone lens mounted to a 5D3......nice and light

hahahaha
nice

The closest you'd get for an 18-55mm f3.5-5.6 on a full frame would be the Canon 28-80mm f/3.5-5.6 lens. Essentially the same field of view and aperture, but in EF.

To get the equivalent view and speed to replace the 55-250 then you'd have to get the 100-400mm. Significantly bigger, but if you want cheap and light then they're going to have to build it smaller which will mean it'll be slower than f/5.6 and basically useless.

thanks a lot
I'm thinking of the 100-400L
and the 24-105L
nice focal length