> I've never used
> a 17 or 18mm superwide, so what does the extra 3-4mm of FL give you -
> both good and bad?
I have a vivitar 17/3.5;
http://www.danielmitchell.net/sgal/index.php?gallery=./Rides/LakeMinnewanka&image=Beach.jpg
for a sample (possibly that link'll need rejoining). It's sharp enough
to the corners that I'm happy with it optically, though I haven't
compared it to others.
As for how useful is it -- for interiors, great. For landscapes, it's
a great way to take big mountains and make them look very small.. It's
the lens with which I've taken the most photos that do essentially the
opposite of what I was intending, if you see what I mean.
The secret is as always to put something in the foreground to fix
that, and once I'd worked that out it works fine; or use it for
deliberate distortion, of course.
I'm glad I own it, but I'm also glad I didn't pay very much for mine,
given how much use it gets overall.
-- dan
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