--
Keith Whaley wrote:
[EMAIL PROTECTED] wrote:
I've bought the famous Pentax Zoom A 70/210 4 but i'm a little bit
disapointed because there are
pincushion distortions.
When I take a picture, for exemple, of a painting, the borders are deformed.
Is it normal ? For me it's important because I do a lot of architectural photos.
As I understand it it is quite normal and perhaps unavoidable for zooms to
have pincusion or barrel distortion in some portion of their focal length ranges--all the big expensive Nikon and Canon stuff has it.
Are you sure about that ?
If I were a pro with a very expensive Canon kit, for instance, I'd really get upset with Canon if I found distortion at one end or the other.
That's presumably why you pay the high price for those outrageous lenses!
Since I don't
shoot anything that requires distortion-free performance I don't notice it. Note that many PRIMES have some barrel or pincusion distortion too, even 50s.
You might see if there is one focal length, probably near the middle of the range, in which the zoom shows no distortion or less distortion. Most of the Nikon zooms I've read reviews of apparently have a spot somewhere in the middle of the range that is distortion free, but have barrel distortion wider than that and pincushion distortion longer than that. Apparently that is about as good as it gets with zooms.
Okay, but it still seems unacceptable to me.
Maybe I've lived with my head in the clouds too long.
Time to recognize those horribly expensive lenses have their optical faults too!
I'm curious what the gigantic 80-210/4.5 SMC-T lens could do!
DJE
keith whaley
-- graywolf http://graywolfphoto.com
"You might as well accept people as they are, you are not going to be able to change them anyway."
