Archive 2013 · Out-of-focus double image

Adam Deglmann
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p.1 #1 · p.1 #1 · Out-of-focus double image

I recently got a Canon 70-300L, and am noticing some unusual behavior in OOF areas that I've never seen with my other lenses, including the 300 f/4L it replaced. It seems, especially in high contrast areas (leaves against sky for example) that there is a second, fainter image. I've noticed this both with and without filters. The last time it happened I was shooting through a window, and I'm not sure if that's usually the case. Is there anything that can be done to avoid this? I'm mostly wondering if this is a property of the lens, or something to do with my technique.

Here is an example image: http://adamdeglmann.com/temp/IMG_3337.JPG

Oct 16, 2013 at 11:43 AM

Karl Witt
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p.1 #2 · p.1 #2 · Out-of-focus double image

Shooting through glass will give unpredictable results.

What was your shutter speed on this shot? Looks like the leaves were moving in the wind a bit?
How big of a crop are you showing here?

If you have an L lens don't use an XYZ filter on it, quality glass in front of quality glass if you even need a filter.

The bird shows no signs of 'doubling'? How close were the leaves and branch to you?

Karl

here is your example shot

Edited on Oct 16, 2013 at 12:47 PM · View previous versions

Oct 16, 2013 at 12:08 PM

Tim Kuhn
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p.1 #3 · p.1 #3 · Out-of-focus double image

You also didn't mention if the window was single, double or triple paned

Tim

Oct 16, 2013 at 12:12 PM

Adam Deglmann
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p.1 #4 · p.1 #4 · Out-of-focus double image

Thanks for the response. The windows hadn't occurred to me until I was writing this post, hopefully that's the culprit. The example shot is approximately a 2/3 crop. 1/500s at f/5.6. I would think it was motion blur except that it's identical in a string of shots. When using a filter, it was a multi-coated B+W, but it didn't make any noticeable difference.

Oct 16, 2013 at 12:12 PM

Adam Deglmann
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p.1 #5 · p.1 #5 · Out-of-focus double image

Thank you for posting my photo to the thread. It's a double pane window, and this particular shot was at an angle to the glass. I'll try a test shot without the window and see what I get.

Oct 16, 2013 at 12:13 PM

Adam Deglmann
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p.1 #6 · p.1 #6 · Out-of-focus double image

Just tried another shot with the window open and it seems fine. This is my usual bird watching window when I'm working from home, so it's odd I never had this issue with other lenses. I'm glad to see it's not just a property of my new lens though. Thanks everybody!

Oct 16, 2013 at 12:16 PM


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