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[OM] Re: OM Teleconverter 1.4xA?

Subject: [OM] Re: OM Teleconverter 1.4xA?
From: "Allen Coltrin" <hjlantern@xxxxxxx>
Date: Sun, 18 Feb 2007 19:36:28 -0800
How in hell do you get your pics bellow to go back and forth on the 
vignetting?

Allen


>From: Moose <olymoose@xxxxxxxxx>
>Reply-To: olympus@xxxxxxxxxx
>To: olympus@xxxxxxxxxx
>Subject: [OM] Re: OM Teleconverter 1.4xA?
>Date: Sun, 18 Feb 2007 17:57:55 -0800
>
>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
>
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