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Old Apr 3, 2006, 9:50 PM   #41
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Here is a photo I took in P mode with flash. I think its got decent sharpness...
What do you all think?
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Old Apr 3, 2006, 11:38 PM   #42
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Now I know what you meant. When I use either macro or super macro, I usually leave the lens at full wide angle since it allows you to get the closest to the subject. To use zoom in macro mode,I find the need fora macro or close-up lens to help out. It is possible that perhaps lighting was coincidentallybetter when I took the pictures w/ the pol but I have serious doubts that that was it. But, as I said, I need to test some more before I can I draw any conclusions. Now that it's getting darker later, I might take some pictures one of these days when I get home from work to see how it goes.
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Old Apr 3, 2006, 11:41 PM   #43
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That's a very nice shot, Jacko. What camera settings did you use in terms of color effect, SCN mode, ISO, etc.?
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Old Apr 5, 2006, 3:55 PM   #44
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I was checking some sites that talk about polarizer filters to see if I could find any articles that described in detail the differences betweenlinear and circular polarizers and I came across this particular site that states the following:

"...The difference is that all auto focus SLRs and DSLRs that I know of require the use of a circular polarizer. This is because the reflex mirror is partly reflecting, and as mentioned earlier, partially reflecting surfaces can polarize light. A circular polarizer negates this effect and so avoids small metering (and possibly AF) errors that could otherwise occur."

As I mentioned previously, I had noticed asignificant improvement on the S2 AF with the polarizer and according to this article, it appears that my perceptionwas not that unreasonable. Perhaps the polarizer does help the S2 AF by correcting the light reaching the sensor. I'm still planning to fully test my theory.
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Old Apr 5, 2006, 5:00 PM   #45
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Here is EXIF info:
File: - F:\Pics\Toronto\3.10.06\Image 120.jpg

Make - Canon
Model - Canon PowerShot S2 IS
Orientation - Top left
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
DateTime - 2006:04:04 09:30:24
YCbCrPositioning - Centered
ExifOffset - 196
ExposureTime - 1/60 seconds
FNumber - 3.50
ExifVersion - 0220
DateTimeOriginal - 2006:04:04 09:30:24
DateTimeDigitized - 2006:04:04 09:30:24
ComponentsConfiguration - YCbCr
CompressedBitsPerPixel - 5 (bits/pixel)
ShutterSpeedValue - 1/60 seconds
ApertureValue - F 3.51
ExposureBiasValue - 0.33
MaxApertureValue - F 3.51
MeteringMode - Center weighted average
Flash - Flash fired, auto mode, red-eye reduction mode
FocalLength - 15.60 mm
UserComment -
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 2592
ExifImageHeight - 1944
InteroperabilityOffset - 2174
FocalPlaneXResolution - 11520.00
FocalPlaneYResolution - 11571.43
FocalPlaneResolutionUnit - Inch
SensingMethod - One-chip color area sensor
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Manual
WhiteBalance - Auto
DigitalZoomRatio - 1.00 x
SceneCaptureType - Standard

Maker Note (Vendor): -
Macro mode - Normal
Self timer - Off
Quality - Superfine
Flash mode - Auto + red-eye reduction
Sequence mode - Single or Timer
Focus mode - Single
Image size - Large
Easy shooting mode - Manual
Digital zoom - None
Contrast - Normal
Saturation - Normal
Sharpness - High , +1
ISO Value - Auto
Metering mode - Center weighted
Focus type - Auto
AF point selected -
Exposure mode - Program
Focal length - 600 - 7200 mm (100 mm)
Flash activity -
Flash details - Internal
Focus mode 2 - Single
White Balance - Auto
Sequence number - 0
Flash bias - 2047.00 EV
Subject Distance - 70
Image Type - IMG:PowerShot S2 IS JPEG
Firmware Version - Firmware Version 1.00
Image Number - 1151535
Owner Name -

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Old Apr 5, 2006, 10:30 PM   #46
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Point and shoot cameras are supposed to be fine with any kind of polarizer.

IMHO if a polarizer makes a difference it's likely that the resultant increase in contrast or reduction in glare would be the principle reason. This might help enhance some vertical line or pattern that the camera might not have otherwise been able to distinguish, or it might reduce the effect of background clutter. I wonder if underexposing would serve the same purpose under some circumstances?

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As I mentioned previously, I had noticed asignificant improvement on the S2 AF with the polarizer and according to this article, it appears that my perceptionwas not that unreasonable. Perhaps the polarizer does help the S2 AF by correcting the light reaching the sensor. I'm still planning to fully test my theory.
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Old Apr 6, 2006, 4:32 PM   #47
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I think we are talking two different things. The increase in contrast, reduction in glareor increase insharpnessare the "after-the-fact" results of using a pol. I'mtalking aboutthe possibleimpact ofa polarizer filteron thecamera's ability to focus while in macro mode. My experience was that with the pol on, the S2 did not hunt for focus nearly as much. It was able to lock thefocus pretty darn quick on flowers, water drops, etc.
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Old Apr 6, 2006, 6:46 PM   #48
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No, were are on the same wavelengh - the POL filter increases contrast and reduces glare in the image before it hits the sensor. The sensor is therefore receiving a more contrasty and less glary look at the subject - maybe this enables the processor to better see lines and patterns - net effect, it can focus faster.

So this leads me to wonder if increasing the contrast in other ways might also help the camera focus. If the processor is analysing the image adjusted according to user's camera settings, then changing the contrast in the settings may also have some positive affect on the ability to focus.

Pure speculation - but potentially able to be investigated by experimentation.

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I think we are talking two different things. The increase in contrast, reduction in glareor increase insharpnessare the "after-the-fact" results of using a pol. I'mtalking aboutthe possibleimpact ofa polarizer filteron thecamera's ability to focus while in macro mode. My experience was that with the pol on, the S2 did not hunt for focus nearly as much. It was able to lock thefocus pretty darn quick on flowers, water drops, etc.
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Old Apr 6, 2006, 11:13 PM   #49
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Yes, we are indeed on the same page!!! You brought up a good point worth testing. I have my S2 set to VIVID and although I think it produces sharper images (no "fog effect"), I haven't really noticed a much faster AF as I did with the polarizer on but I can't say it for sure.I think it's time to get the notebook, build a matrixand write down the results of different combinations (filter/no filter, VIVID/no color effect/custom + xtra sharpening, etc.).
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Old Apr 10, 2006, 8:56 PM   #50
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Thanks for all the tips folks. They will be going in my photo notebook that I carry along with me. I have started taking a few shots on Vivid. Here is one:
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