Well, those look better than I expected, I thought the vignetting would be
much worse. The low contrast is no surprise either, but I hadn't considered
barrel distortion. However, I think I can live with than as well. Am I
correct to assume that PTLens would not work with scans, only files from
digital cameras? It looks like it could be a very useful program. My other
main concern is with focusing in low light conditions, what are your
thoughts on this, having field tested the combo?
Thanks for the samples,
Darin
Moose wrote:
> OK, here it comes. Things aren't quite as good as I at first believed,
> but not a disaster, either.
>
> My first test was a shot where the top corners are naturally dark, and
> it didn't look bad to me. It's not all that easy to find a relatively
> distant subject that doesn't move in the breeze around here, at least
> not without leaving the yard. :-) , so I gave up on pretty.
> Fortunately (yeah, right), they ended the utilities under grounding
> project around the corner, so I have a utility pole available.
>
> I also took out my new right angle finder with 2x and remote cord for
> the 5D, so I could do my best to compare resolution of a few lenses and
> converters. So far, I've only addressed the Sigma 600/8 with Kiron 1.5x
> converter.
>
> With the different subject, with detail in the center and plain blue sky
> in the corners, a vignetting worst case, vignetting is worse than I
> thought. Worse yet, the more linear subject revealed considerable barrel
> distortion. Fortunately, PTLens can deal with those pretty well. I
> simply tried a couple of distortion profiles for super wide lenses and
> found one that does a nice job on this image too.
>
> Here's that image, as is at camera defaults, with correction for the low
> contrast of the lens combo, and with the PTLens corrections
> <http://www.moosemystic.net/Gallery/tech/Lenses/Sigma600/Pole.htm>.
>
> I then went back to the original shot and applied the same corrections;
> quite a difference
> <http://www.moosemystic.net/Gallery/tech/Lenses/Sigma600/Juniper.htm>.
>
> So, for some purposes, not an ideal combination, but for your goal of
> shooting critters and birds, where the outer parts generally get cropped
> anyway, it should work pretty well.
>
> Moose
>
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