Strange effect (double lines) with polarizer

Noisychip · 05-05-2009, 12:49 PM

Recently I discovered this strange effect when using (various) wide angle lenses with a polarizer.

Has anyone seen this before? Any explanations or solutions?

Thank you!

EXIF:
Camera Model Name: PENTAX K10D
Exposure Time: 1/45
F Number: 8.0
ISO: 100
Focal Length: 20.0 mm
Shake Reduction: On

Attached Images

k100d · 05-05-2009, 01:30 PM

cheap polarizer?

**Lowell Goudge** · 05-05-2009, 01:36 PM

out of focus and CA?

ftpaddict · 05-05-2009, 01:44 PM

Cheap polarizer, out of focus and CA?

sharko · 05-05-2009, 01:45 PM

Wind maybe? A polarizer eats light and will slow your shutter speeds down.

heliphoto · 05-05-2009, 01:47 PM

windy day and the polarizer is dropping the shutter speed too much?

ftpaddict · 05-05-2009, 01:50 PM

The background looks blurry as well. Another crop would help.

Big G · 05-05-2009, 02:05 PM

Did you buy a circular or a linear polariser?

Strictly speaking, you should buy a circular as it can screw up the focusing - however I bought a linear polariser and haven't a problem with the AF.

Just thought i'd mention it.

stevebrot · 05-05-2009, 02:08 PM

Originally posted by heliphoto

windy day and the polarizer is dropping the shutter speed too much?

That is my guess. Perhaps the OP could post a picture of something less limber?

Steve

Noisychip · 05-06-2009, 10:01 AM

Originally posted by sharko

Wind maybe? A polarizer eats light and will slow your shutter speeds down.

Hm, shutter speed was 1/45 s and it wasn't even very windy ... don't know

Noisychip · 05-06-2009, 10:06 AM

Originally posted by ftpaddict

The background looks blurry as well. Another crop would help.

Here you are. The shot was manually focused, I agree, it's not perfectly sharp.

Noisychip · 05-06-2009, 10:10 AM

Originally posted by stevebrot

That is my guess. Perhaps the OP could post a picture of something less limber?

Steve

Good idea

I've tried to reproduce the problem before, but the effect didn't show up. It shows only in very few images, always at daylight with polarizer ...

05-05-2009, 12:49 PM	#1
Noisychip Senior Member Join Date: Mar 2008 Posts: 282	Strange effect (double lines) with polarizer Recently I discovered this strange effect when using (various) wide angle lenses with a polarizer. Has anyone seen this before? Any explanations or solutions? Thank you! EXIF: Camera Model Name: PENTAX K10D Exposure Time: 1/45 F Number: 8.0 ISO: 100 Focal Length: 20.0 mm Shake Reduction: On Attached Images

05-06-2009, 10:06 AM	#11
Noisychip Senior Member Join Date: Mar 2008 Posts: 282 Original Poster	Originally posted by ftpaddict The background looks blurry as well. Another crop would help. Here you are. The shot was manually focused, I agree, it's not perfectly sharp. Attached Images

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05-05-2009, 01:30 PM	#2
k100d Veteran Member Join Date: Feb 2008 Location: Toronto Posts: 3,911	cheap polarizer?

05-05-2009, 01:36 PM	#3
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,887	out of focus and CA?

05-05-2009, 01:44 PM	#4
ftpaddict Veteran Member Join Date: Jan 2008 Location: Yurp Photos: Gallery Posts: 4,666	Cheap polarizer, out of focus and CA?

05-05-2009, 01:45 PM	#5
sharko Senior Member Join Date: May 2008 Location: City of Angels Photos: Gallery Posts: 278	Wind maybe? A polarizer eats light and will slow your shutter speeds down.

05-05-2009, 01:47 PM	#6
heliphoto Veteran Member Join Date: May 2008 Location: Region 5 Photos: Gallery Posts: 2,539	windy day and the polarizer is dropping the shutter speed too much?

05-05-2009, 01:50 PM	#7
ftpaddict Veteran Member Join Date: Jan 2008 Location: Yurp Photos: Gallery Posts: 4,666	The background looks blurry as well. Another crop would help.

05-05-2009, 02:05 PM	#8
Big G Veteran Member Join Date: May 2009 Posts: 581	Did you buy a circular or a linear polariser? Strictly speaking, you should buy a circular as it can screw up the focusing - however I bought a linear polariser and haven't a problem with the AF. Just thought i'd mention it.

05-05-2009, 02:08 PM	#9
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by heliphoto windy day and the polarizer is dropping the shutter speed too much? That is my guess. Perhaps the OP could post a picture of something less limber? Steve

05-06-2009, 10:01 AM	#10
Noisychip Senior Member Join Date: Mar 2008 Posts: 282 Original Poster	Originally posted by sharko Wind maybe? A polarizer eats light and will slow your shutter speeds down. Hm, shutter speed was 1/45 s and it wasn't even very windy ... don't know

05-06-2009, 10:10 AM	#12
Noisychip Senior Member Join Date: Mar 2008 Posts: 282 Original Poster	Originally posted by stevebrot That is my guess. Perhaps the OP could post a picture of something less limber? Steve Good idea I've tried to reproduce the problem before, but the effect didn't show up. It shows only in very few images, always at daylight with polarizer ...