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Old May 17, 2009, 12:57 PM   #1
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Default Filter flare

I have found that filter flare has ruined some images and possibly affects the accuracy of my K10's focusing system. I use a decent quality Hoya UV filter (not an expensive multi-coated filter which may be fine). The first image posted was with the filter, I then removed the filter and shot the second image (the lens was the FA 50mm f1.4)

The difference between the two should be immediately apparent, and I did repeat the experiment to prove it was that bad. From now on the metal lens hood will be the only protection for my FA 50mm and my FA 28-70mm f4, no more UV filters. BTW other than resizing using Windows Powertoys these images are just as they came from the camera.

Ira
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Old May 17, 2009, 2:05 PM   #2
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Never would have expected that there would be such a difference.

Thanks for posting this, now I'm going have to check out my filters,
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Old May 17, 2009, 3:06 PM   #3
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That looks more like a reflection of a window than flare. Perhaps because the filter is flat and the first lens surface curved?
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Old May 17, 2009, 3:08 PM   #4
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All glass will reflect a TINY amount of light, I'm guessing that the bright light entered the window, a tiny portion reflected off the lens and a tiny portion of that was reflected back off the inside of filter and back into the lens....

but who am I to say?
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Old May 17, 2009, 6:48 PM   #5
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I can show several other examples of this, the filter causes the flare, without it the images are fine. Expensive multi-coated filters probably work fine but the average mid range filter, such as the Hoya I used, will cause issues if there is a bright light in an otherwise low light image. In normal lighting there are no issues but under these specific circumstances flare will often occur.

Check out http://www.luminous-landscape.com/co...m-feb-05.shtml and this http://toothwalker.org/optics/filterflare.html and even this http://www.flickr.com/groups/technique/discuss/7433/

Ira
Here is another example, notice the green dots corresponding to the candles in this low light shot.
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Old May 17, 2009, 8:12 PM   #6
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I have a feeling that "filter flare" was my problem in my "Red River Locks" image... (I have it posted here under that title in one of the forums)

I realized after the shots that I had left my (very cheap) polarizing filter on the lens when I jumped out of the car to take my shots....
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