Darin wrote:
> Very good to hear. I'd love to see some samples, if you have the time, feel
> free to send them directly to me if you'd like.
>
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
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|