I don't have too many wide open examples, but the ones posted above speaks for themselves I guess. It's fully "usable" @ f/1.8, but you probably want to stop down to f/2.8 for some sort of reasonable sharpness, unless it is really really dark. The worst thing with this lens is the distortion, that's impossible to correct. If you crop the image to a FOV resembling APS-C, the distorsion is pure barrel shaped. But then it changes to wave shaped towards the edges of the full frame. This is not a good lens for any kind of architecture or such. Sharpness seems best at f/4, so it's not ideal for landscapes either. But on the other hand, that fast f/1.8 aperture is really unique for such a wide lens, so if you don't mind its weaknesses, have a go!
Here's what you can do, for example. ISO 11200 and f/1.8.
To put things in perspective, a 20/1.8 on FX has FOV resembling a 13mm lens on DX and DOF resembling an f/1.4 aperture. The speed is similar too, since you can easily bump the ISO up a stop over DX. How unique is that? Can you imagine a 13mm f/1.4 prime for DX? I know I would buy one.
To put things in perspective, a 20/1.8 on FX has FOV resembling a 13mm lens on DX and DOF resembling an f/1.4 aperture. The speed is similar too, since you can easily bump the ISO up a stop over DX. How unique is that? Can you imagine a 13mm f/1.4 prime for DX? I know I would buy one.
It's even worse! FX vs. DX is a 1.17 stop DOF difference, which means you would need a 13/1,2.
James R wrote:
You still shooting Canon or straight Nikon?
I got my 30d yet, but it is on it's way out. I guess I'm more of a "I like a tool that does the things that I like it to do"-guy than a "I don't care about the tool, as long as i have the 100% best IQ avilable"-guy :P
I just think I like the product philosophy of nikon better.
