I would use what you have and get a pano bracket. Then a 28mm equivalent works very well.
It will also be useful if you start doing 360x180 real estate work... But then you will need the Nikon 10.5 fish eye or sigma equivalent.
These pics show various angles you can easily achieve with a 28mm equivalent all taken with the camera in portrait orientation
2 shots wide 95 degrees
5 shots wide 150 degrees
2 shots wide 95 degrees
6 shots wide 165 degrees
Used Nikon f/4 12-24mm for less than £500, or a new (and just as good) Tokina 12-24mm f/4 - think they're about £420 new. Awesome lens and miles better than that crappy Sigma 10-20mm
This was straight out of the camera, no sharpening done, with that crappy 10-20 on a Canon 350d.
Nothing at all. But as you can see specialman said the Sigma 10-20 was crap and I was just pointing out that it wasn't.
It will certainly suffer from Barrel and pincushion distortions, but that can be easily corrected automatically with PTLens.
Your shot indeed looks sharp.
However is it sharp over the entire field, and is that field flat, It will certainly suffer from Barrel and pincushion distortions, but that can be easily corrected automatically with PTLens.
Having owned the 10-20 & tried it with PTlens I found it only corrected the less obvious distortions...at the extremes the Sigma produced images way beyond distortion correction and personally I didn't like the effect - I sold mine recently & have now started to go the "pano" route instead
simon
Sharp over the entire cyclist, obviously background is falling out of focus due to that thing we call depth of field QUOTE]
Does it provide corner to corner sharpness in a flat field?
Barrel and Pincushion distortions are the result of the lens computation decisions taken by the designer. They can effect wide angle and telephoto lenses, zooms usually pass from one to the other being neutral in the centre of the range.Yes barrel distortion is pretty bad. As far as pincushioning goes, that's a telephoto effect.
Distortions are unbelievably simple to correct, however perspective distortion is not.
Not so... The lens in question seem to suffer from moustache distortion. this is very difficult to correct indeed.
Perspective distortion is the the simplest to correct of all as it is geometric.
The Sigma 10-20mm on the Canon is a great lens, I think they do a Nikon fit so could be worth a look