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#1
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Polarizer weirdness
OK, here's something I can't find a reference to, although I just
started looking. I'm using a Canon Digital Rebel XTi while I wait for whatever Canon's going to come out with to one-up their own 1Ds Mark II, and I recently picked up a new 10-22 EFS lens to get some wide angle coverage back (my other lenses are a 24-105mm L f4, a 100-400mm L f4, a 28-300 L f3.5-5.6, a 70-200 L f2.8, and a 70-300mm DO). When I use a polarizer with the new 10-22, I get non-complete polarizing coverage - i.e., the polarization will only be apparent in one area of the frame - a circular area above vertical center and dead center horizontally if the sun is actually 90 degrees to my port or starboard (g), or a elliptical area to left or right of center if the angle is not so close to 90 degrees. No vignetting occurs. I can provide examples if necessary. I'm using a mid range Sunpak 77mm circular polarizer most of the tiime, but the effect still happens when I use the high end B+W and/or Hoya Super Pro polarizers that I normally have on the L series lenses (no sense putting good glass on a camera and then using crap for filters!), so it doesn't appear to be polarizer quality related. Has anyone else encountered this? Is this some inherent problem due to the more pronounced curvature of the front lens in these extreme wide angle lenses, or it some weirdness that I can correct for? Would it help using a Cokin Pro ("Pro", NOT "P") series filter polarizer, as it would be wider than the lens? Would going to a linear polarizer help (as digitals can use either, even though they are autofocus)? |
#2
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Polarizer weirdness
Ken Lucke writes:
OK, here's something I can't find a reference to, although I just started looking. Look here, the part about using polarizers with wide angle lenses: http://www.luminous-landscape.com/tu...larizers.shtml |
#3
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Polarizer weirdness
In article , Paul Rubin
wrote: http://www.luminous-landscape.com/tu...larizers.shtml OK, so I take it that there's no solution? Damn. |
#4
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Polarizer weirdness
Ken Lucke writes:
http://www.luminous-landscape.com/tu...larizers.shtml OK, so I take it that there's no solution? Damn. A "solution" is only needed if you feel that there's a problem. As the article explains, that wideangle effect can still make good photos. And there's always postprocessing... |
#5
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Polarizer weirdness
In article , Paul Rubin
wrote: Ken Lucke writes: http://www.luminous-landscape.com/tu...larizers.shtml OK, so I take it that there's no solution? Damn. A "solution" is only needed if you feel that there's a problem. As the article explains, that wideangle effect can still make good photos. Yes, but I don't always want that effect. And there's always postprocessing... I shoot digital with the intent to do as little post- work as possible. I want to do it right the first time. While I have absolutely nothing against _necessary_ post-processing (photographers have ALWAYS manipulated their images anyway, from as simple as choice of film, using filters, or cropping, dodging, and burning to sophisticated emulsion adjustments and processing solutions to get the look they want, so the "digital vs. film" argument falls on deaf ears here when it comes to whether or not "post processing" is bad), and nothing against manipulated images per se (when that is the intent), I choose to look at an image that needs more than slight correction as one that I would not normally use, and that the extra post-processing it would need is a crutch for failing to do it right at the time. That's not to say that I don't use additional processing at times [some images are just too good to lose through snobbery), just that my _goal_ is to be "spot on" when I press the shutter. |
#6
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Polarizer weirdness
you may have to find a bracket type mounted polarizer. but im not sure if
that will even help Online camera club of friendly photographers http://www.photochimper.com/forum "Ken Lucke" wrote in message ... OK, here's something I can't find a reference to, although I just started looking. I'm using a Canon Digital Rebel XTi while I wait for whatever Canon's going to come out with to one-up their own 1Ds Mark II, and I recently picked up a new 10-22 EFS lens to get some wide angle coverage back (my other lenses are a 24-105mm L f4, a 100-400mm L f4, a 28-300 L f3.5-5.6, a 70-200 L f2.8, and a 70-300mm DO). When I use a with the new 10-22, I get non-complete polarizing coverage - i.e., the polarization will only be apparent in one area of the frame - a circular area above vertical center and dead center horizontally if the sun is actually 90 degrees to my port or starboard (g), or a elliptical area to left or right of center if the angle is not so close to 90 degrees. No vignetting occurs. I can provide examples if necessary. I'm using a mid range Sunpak 77mm circular polarizer most of the tiime, but the effect still happens when I use the high end B+W and/or Hoya Super Pro polarizers that I normally have on the L series lenses (no sense putting good glass on a camera and then using crap for filters!), so it doesn't appear to be polarizer quality related. Has anyone else encountered this? Is this some inherent problem due to the more pronounced curvature of the front lens in these extreme wide angle lenses, or it some weirdness that I can correct for? Would it help using a Cokin Pro ("Pro", NOT "P") series filter polarizer, as it would be wider than the lens? Would going to a linear polarizer help (as digitals can use either, even though they are autofocus)? |
#7
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Polarizer weirdness
On Sat, 10 Nov 2007 06:55:07 -0500, "Rich" wrote:
you may have to find a bracket type mounted polarizer. but im not sure if that will even help Online camera club of friendly photographers http://www.photochimper.com/forum "Ken Lucke" wrote in message ... OK, here's something I can't find a reference to, although I just started looking. I'm using a Canon Digital Rebel XTi while I wait for whatever Canon's going to come out with to one-up their own 1Ds Mark II, and I recently picked up a new 10-22 EFS lens to get some wide angle coverage back (my other lenses are a 24-105mm L f4, a 100-400mm L f4, a 28-300 L f3.5-5.6, a 70-200 L f2.8, and a 70-300mm DO). When I use a with the new 10-22, I get non-complete polarizing coverage - i.e., the polarization will only be apparent in one area of the frame - a circular area above vertical center and dead center horizontally if the sun is actually 90 degrees to my port or starboard (g), or a elliptical area to left or right of center if the angle is not so close to 90 degrees. No vignetting occurs. I can provide examples if necessary. I'm using a mid range Sunpak 77mm circular polarizer most of the tiime, but the effect still happens when I use the high end B+W and/or Hoya Super Pro polarizers that I normally have on the L series lenses (no sense putting good glass on a camera and then using crap for filters!), so it doesn't appear to be polarizer quality related. Has anyone else encountered this? Is this some inherent problem due to the more pronounced curvature of the front lens in these extreme wide angle lenses, or it some weirdness that I can correct for? Would it help using a Cokin Pro ("Pro", NOT "P") series filter polarizer, as it would be wider than the lens? Would going to a linear polarizer help (as digitals can use either, even though they are autofocus)? Odd, but it may actually be the composition of the lens components themselves. I once had a microscope objective for my phase contrast microscope (Leica optics) that I ordered with the express purpose for thin-sections of minerals under polarized light. All my images came out with a maltese-cross polarizing pattern in them. It was definitely in the objective because when that component was turned in the optics and lighting configuration then the pattern turned. I had it exchanged, after much arguing with the sales rep on what the problem was, and how could it possibly be. For all intents and purposes this should not have happened due to the type of materials used in that objective. We could only surmise that that particular blank of glass used to create the lens had a peculiar stress pattern in it. After exchange for the very same objective model from the same company, just a different manufacturing date, it didn't have this defect. If this is the case, then .... so much for "L" meaning anything when buying glass. |
#8
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Polarizer weirdness
On Sat, 10 Nov 2007 12:23:21 GMT, trevor-johnson
wrote: On Sat, 10 Nov 2007 06:55:07 -0500, "Rich" wrote: you may have to find a bracket type mounted polarizer. but im not sure if that will even help Online camera club of friendly photographers http://www.photochimper.com/forum "Ken Lucke" wrote in message ... OK, here's something I can't find a reference to, although I just started looking. I'm using a Canon Digital Rebel XTi while I wait for whatever Canon's going to come out with to one-up their own 1Ds Mark II, and I recently picked up a new 10-22 EFS lens to get some wide angle coverage back (my other lenses are a 24-105mm L f4, a 100-400mm L f4, a 28-300 L f3.5-5.6, a 70-200 L f2.8, and a 70-300mm DO). When I use a with the new 10-22, I get non-complete polarizing coverage - i.e., the polarization will only be apparent in one area of the frame - a circular area above vertical center and dead center horizontally if the sun is actually 90 degrees to my port or starboard (g), or a elliptical area to left or right of center if the angle is not so close to 90 degrees. No vignetting occurs. I can provide examples if necessary. I'm using a mid range Sunpak 77mm circular polarizer most of the tiime, but the effect still happens when I use the high end B+W and/or Hoya Super Pro polarizers that I normally have on the L series lenses (no sense putting good glass on a camera and then using crap for filters!), so it doesn't appear to be polarizer quality related. Has anyone else encountered this? Is this some inherent problem due to the more pronounced curvature of the front lens in these extreme wide angle lenses, or it some weirdness that I can correct for? Would it help using a Cokin Pro ("Pro", NOT "P") series filter polarizer, as it would be wider than the lens? Would going to a linear polarizer help (as digitals can use either, even though they are autofocus)? Odd, but it may actually be the composition of the lens components themselves. I once had a microscope objective for my phase contrast microscope (Leica optics) that I ordered with the express purpose for thin-sections of minerals under polarized light. All my images came out with a maltese-cross polarizing pattern in them. It was definitely in the objective because when that component was turned in the optics and lighting configuration then the pattern turned. I had it exchanged, after much arguing with the sales rep on what the problem was, and how could it possibly be. For all intents and purposes this should not have happened due to the type of materials used in that objective. We could only surmise that that particular blank of glass used to create the lens had a peculiar stress pattern in it. After exchange for the very same objective model from the same company, just a different manufacturing date, it didn't have this defect. If this is the case, then .... so much for "L" meaning anything when buying glass. It sounds to me like the OP is observing the way the light in the sky is polarized, nothing at all wrong with the camera or polarizer. It's a common observance with polarizers and wide angle lenses. Examine the sky through the polarizer without mounting it on the camera, some parts of the sky will show more effect than others. |
#9
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Polarizer weirdness
On Sat, 10 Nov 2007 12:31:10 GMT, Charles wrote:
On Sat, 10 Nov 2007 12:23:21 GMT, trevor-johnson wrote: On Sat, 10 Nov 2007 06:55:07 -0500, "Rich" wrote: you may have to find a bracket type mounted polarizer. but im not sure if that will even help Online camera club of friendly photographers http://www.photochimper.com/forum "Ken Lucke" wrote in message ... OK, here's something I can't find a reference to, although I just started looking. I'm using a Canon Digital Rebel XTi while I wait for whatever Canon's going to come out with to one-up their own 1Ds Mark II, and I recently picked up a new 10-22 EFS lens to get some wide angle coverage back (my other lenses are a 24-105mm L f4, a 100-400mm L f4, a 28-300 L f3.5-5.6, a 70-200 L f2.8, and a 70-300mm DO). When I use a with the new 10-22, I get non-complete polarizing coverage - i.e., the polarization will only be apparent in one area of the frame - a circular area above vertical center and dead center horizontally if the sun is actually 90 degrees to my port or starboard (g), or a elliptical area to left or right of center if the angle is not so close to 90 degrees. No vignetting occurs. I can provide examples if necessary. I'm using a mid range Sunpak 77mm circular polarizer most of the tiime, but the effect still happens when I use the high end B+W and/or Hoya Super Pro polarizers that I normally have on the L series lenses (no sense putting good glass on a camera and then using crap for filters!), so it doesn't appear to be polarizer quality related. Has anyone else encountered this? Is this some inherent problem due to the more pronounced curvature of the front lens in these extreme wide angle lenses, or it some weirdness that I can correct for? Would it help using a Cokin Pro ("Pro", NOT "P") series filter polarizer, as it would be wider than the lens? Would going to a linear polarizer help (as digitals can use either, even though they are autofocus)? Odd, but it may actually be the composition of the lens components themselves. I once had a microscope objective for my phase contrast microscope (Leica optics) that I ordered with the express purpose for thin-sections of minerals under polarized light. All my images came out with a maltese-cross polarizing pattern in them. It was definitely in the objective because when that component was turned in the optics and lighting configuration then the pattern turned. I had it exchanged, after much arguing with the sales rep on what the problem was, and how could it possibly be. For all intents and purposes this should not have happened due to the type of materials used in that objective. We could only surmise that that particular blank of glass used to create the lens had a peculiar stress pattern in it. After exchange for the very same objective model from the same company, just a different manufacturing date, it didn't have this defect. If this is the case, then .... so much for "L" meaning anything when buying glass. It sounds to me like the OP is observing the way the light in the sky is polarized, nothing at all wrong with the camera or polarizer. It's a common observance with polarizers and wide angle lenses. Examine the sky through the polarizer without mounting it on the camera, some parts of the sky will show more effect than others. That's what I thought at first, but I read the description more closely. If it was due to normal atmospheric polarization of sunlight then it would be always occurring in a wide band 90 degrees to the sun. Not in offset areas as defined circles and ovals. I frequently use ultra-wide and fish-eye lens configurations. Sometimes with a polarizer just for interesting effects. Highlighting a particular cloud formation in the sky by deepening the sky behind it. Or just to intensify fall colors--banding in the sky be damned, I'll play with post-processing later and see if I can fix that. The band in the sky is there as I described. Sure it will take on a curvature as any straight-line will when using such wide angles, but it's never as a disparate circle or oval area standing apart from horizon or FOV edge. This is what makes me suspect something else is at play. Two different polarizers causing the same effect leads to another optics component as the cause. Primary suspect = main lens. (for now) |
#10
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Polarizer weirdness
"Charles" wrote in message
... On Sat, 10 Nov 2007 12:23:21 GMT, trevor-johnson wrote: On Sat, 10 Nov 2007 06:55:07 -0500, "Rich" wrote: you may have to find a bracket type mounted polarizer. but im not sure if that will even help Online camera club of friendly photographers http://www.photochimper.com/forum "Ken Lucke" wrote in message ... OK, here's something I can't find a reference to, although I just started looking. I'm using a Canon Digital Rebel XTi while I wait for whatever Canon's going to come out with to one-up their own 1Ds Mark II, and I recently picked up a new 10-22 EFS lens to get some wide angle coverage back (my other lenses are a 24-105mm L f4, a 100-400mm L f4, a 28-300 L f3.5-5.6, a 70-200 L f2.8, and a 70-300mm DO). When I use a with the new 10-22, I get non-complete polarizing coverage - i.e., the polarization will only be apparent in one area of the frame - a circular area above vertical center and dead center horizontally if the sun is actually 90 degrees to my port or starboard (g), or a elliptical area to left or right of center if the angle is not so close to 90 degrees. No vignetting occurs. I can provide examples if necessary. I'm using a mid range Sunpak 77mm circular polarizer most of the tiime, but the effect still happens when I use the high end B+W and/or Hoya Super Pro polarizers that I normally have on the L series lenses (no sense putting good glass on a camera and then using crap for filters!), so it doesn't appear to be polarizer quality related. Has anyone else encountered this? Is this some inherent problem due to the more pronounced curvature of the front lens in these extreme wide angle lenses, or it some weirdness that I can correct for? Would it help using a Cokin Pro ("Pro", NOT "P") series filter polarizer, as it would be wider than the lens? Would going to a linear polarizer help (as digitals can use either, even though they are autofocus)? Odd, but it may actually be the composition of the lens components themselves. I once had a microscope objective for my phase contrast microscope (Leica optics) that I ordered with the express purpose for thin-sections of minerals under polarized light. All my images came out with a maltese-cross polarizing pattern in them. It was definitely in the objective because when that component was turned in the optics and lighting configuration then the pattern turned. I had it exchanged, after much arguing with the sales rep on what the problem was, and how could it possibly be. For all intents and purposes this should not have happened due to the type of materials used in that objective. We could only surmise that that particular blank of glass used to create the lens had a peculiar stress pattern in it. After exchange for the very same objective model from the same company, just a different manufacturing date, it didn't have this defect. If this is the case, then .... so much for "L" meaning anything when buying glass. It sounds to me like the OP is observing the way the light in the sky is polarized, nothing at all wrong with the camera or polarizer. It's a common observance with polarizers and wide angle lenses. Examine the sky through the polarizer without mounting it on the camera, some parts of the sky will show more effect than others. I noticed the same when using a polarizer on my zoom at 17mm (APS size sensor camera). Only a small area of sky would be affected, giving odd looking dark areas in the images. It works much better at longer focal lengths. I might try graduated neutral density filters next time. John |
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