More Sigma 70mm/Kenko x2 TC test shots...
Mar 14, 2015 08:14:51 #
bull drink water wrote:
Agreed the differences are negligible. The advantages of using the TC are not though which is cool! Twice the magnification or twice the working distance. (its a dead flower)Bobforget the tree, any difference is tooooo small for me to see.
Mar 14, 2015 09:28:27 #
BobR wrote:
Interesting though I'm not sure how that would be. Bob
That's why I was asking. Is it so? Or just appears to be so? Is it just me?
Mar 14, 2015 09:42:28 #
Flyextreme wrote:
After you pointed it out I think it appears so. Both were shot at f/29 so no change there. I think I cropped the 2x shot ever so slightly to match the Sigma alone shot but I do not think it was enough to change anything. Might be just shot to shot discrepancy. It was a bit windy when I took them. Here are both shots right out of the camera.That's why I was asking. Is it so? Or just appears to be so? Is it just me?
Mar 14, 2015 09:58:08 #
I think I see the very slight difference in focal point now. I believe the DoF is the same in both now. I just needed to look at it differently :|
Mar 14, 2015 10:11:58 #
Flyextreme wrote:
Yes the focal point is slightly different. Difficult to get these things exact. I could have done better. BobI think I see the very slight difference in focal point now. I believe the DoF is the same in both now. I just needed to look at it differently :|
Mar 14, 2015 17:56:34 #
I believe that DoF is a function of distance focused and aperture, so DoF would change with your addition of the converter, if your working distance and focus changed to stay at 1:1 magnification.
Mar 14, 2015 20:12:55 #
Photog21 wrote:
Exactly.I believe that DoF is a function of distance focused and aperture, so DoF would change with your addition of the converter, if your working distance and focus changed to stay at 1:1 magnification.
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