Chuck Norcutt wrote:
> Wow! Thanks! That was a lot of work to illustrate the point.
You are very welcome. Some of the work I had already done as a part of
getting to know the strengths and weaknesses of a new lens that I hope
to use quite a bit. The rest was of value to me too.
> I'd love to have a Zuiko 18 and 21 but I don't think I can justify the
> expense at
> the moment.
I bought mine pre-digital.
> My Zuikos stop at 24/2.8. I used to have the 24 shift.....
>
> I do own PTLens but need to do some test photos and have a couple custom
> profiles created. I was going to do that last year but it got lost in
> the moving shuffle. But I think I found the perfect building for test
> images the other day so have to get back on it.
>
> I was quite surprised at the amount of barrel distortion and also the
> effect on non-architectural images.
The amount didn't surprise me, the obvious effect on natural images did.
> After reviewing lots of lens tests over the past several days I'm thinking
> more and more of using a 17/18mm prime and restricting the zoom to 20-35 or
> 20-40.
>
Unless you have a special need for the extra width, you may not need the
prime. 20 mm used to be ultra wide, and is still pretty darn wide.
> Anyhow, I was very glad to see that the 17mm distortions on the Tamron
> were straight forward barrel distortion and easily corrected in software
> vs. the more troublesome sinusoidal oddities exhibited by some lenses.
>
I'm not so sure about that. Move the mouse rapidly back and forth over
the edge of a couple of the tree shots, it forms a sort of distortion
map visually. Doesn't look like just simple barrel to me. It seems to me
to fit the description of complex distortion under the Distortion choice
here. http://epaperpress.com/ptlens/index.html
On the other hand, PTLens seems to do a very good job on it.
Moose
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