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Old Jun 15, 2005, 6:00 PM   #1
TVM
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Last weekend, I purchased a KM A200. Overall, I'm very pleased with the camera, but I do have a problem with the HAMA Ultra Wide HTMC polarizing circular filter (4mm thick) , that I purchased separately. When using the KM A200 at 28 mm (wideangle) mode, vignetting appears in the upper corners of the image.

Is there any polarizing filter that will not cause such effect ?

Is there another way to protect the camera lens from scratches, etc ?



Looking forward to your comments ...
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Old Jun 15, 2005, 8:55 PM   #2
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TVM wrote:
Quote:
I do have a problem with the HAMA Ultra Wide HTMC polarizing circular filter (4mm thick) , that I purchased separately. When using the KM A200 at 28 mm (wideangle) mode, vignetting appears in the upper corners of the image.

Is there any polarizing filter that will not cause such effect ?
Use a bigger one plus a stepup ring then

TVM wrote:
Quote:
Is there another way to protect the camera lens from scratches, etc ?
A simple UV filter will do, get a thin one


FYI:

http://www.stevesforums.com/forums/v...mp;forum_id=20
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Old Jun 16, 2005, 3:50 AM   #3
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TVM wrote:
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Is there any polarizing filter that will not cause such effect ?
While you're looking for another polarizer use a little amount of digital zoom to avoid vigetting.

Anyway changing the filter is a better solution

bye
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Old Jun 17, 2005, 2:03 AM   #4
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I am using ΓΈ62mm and step up ring without any troubles...
No vignetting noticeable.
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Old Jun 28, 2005, 10:14 PM   #5
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Since you already have the HAMA filter why not remove the vignettte as follows:

1) With the filter in place take a picture of a blank white wall or clear sky

2) Open the vignetted picture in editor such as PhotoImpact or PhotoShop

3) Place the picture in #1 as a layer on your vignetted pic using "subtraction" merge method

Vignette should disappear. Youwill have to play with the transparency of the layer from #3. I also clean up the mask from #3 to remove any noise or colour shifts.

Hope this was helpful.

Les
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