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Circular Polarizers, A Filter You Need
Hi All,
I've written the first of a series of articles on the use of real camera filters with digital photography. The first is on the circular polarizer filter: http://www.dimagemaker.com/article.php?articleID=1063 Cheers, Wayne -- Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog http://www.digitalimagemakerworld.com/ Publisher, Experimental Digital Photography http://www.experimentaldigitalphotography.com Personal art site http://www.cosshall.com/ |
#2
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Circular Polarizers, A Filter You Need
"Wayne J. Cosshall" wrote in message ... Hi All, I've written the first of a series of articles on the use of real camera filters with digital photography. The first is on the circular polarizer filter: http://www.dimagemaker.com/article.php?articleID=1063 Great article. Thanks. |
#3
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Circular Polarizers, A Filter You Need
On Aug 8, 5:33 am, "Wayne J. Cosshall" wrote:
Hi All, I've written the first of a series of articles on the use of real camera filters with digital photography. The first is on the circular polarizer filter: Cheers, Wayne I have one, rarely use it. Additionally, a 77mm multi-coated circular polarizer to fit a great majority of my lenses, including my Mamiya gear, costs a minimum of $150. It's not worth the money. And about your examples, in the first series of thumbnail images, the one w/out polarizer is clearly over exposed, the ones in which you indicate reduced reflection from water and foliage are different, but not necessarily better, and the darkened sky images look unnatural (and again, you tend to overexpose, particularly in the ones with the dam in the background). This is not to say the circular polarizer is not without its uses, but to say it's a filter one "needs" is a stretch, and a big one at that. Finally, aren't you in essence spamming the photography groups in an attempt to make money off our visits to your website, which are replete with advertising? If you want to share info here, please do, but your capitalist endeavors aren't welcome. -- www.mattclara.com (not a single image there taken with a polarizer) |
#4
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Circular Polarizers, A Filter You Need
Wayne J. Cosshall wrote:
Hi All, I've written the first of a series of articles on the use of real camera filters with digital photography. The first is on the circular polarizer filter: http://www.dimagemaker.com/article.php?articleID=1063 Cheers, Wayne I have a circular and a linear polariser. I was told that I would be better to use the circular polariser on my digital camera, as it would give better results. But I've used both the linear and the circular polarisers on my digital and I honestly can't see any difference in the results when I compare the two. |
#5
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Circular Polarizers, A Filter You Need
"Fat Sam" wrote in message
... Wayne J. Cosshall wrote: Hi All, I've written the first of a series of articles on the use of real camera filters with digital photography. The first is on the circular polarizer filter: http://www.dimagemaker.com/article.php?articleID=1063 Cheers, Wayne I have a circular and a linear polariser. I was told that I would be better to use the circular polariser on my digital camera, as it would give better results. But I've used both the linear and the circular polarisers on my digital and I honestly can't see any difference in the results when I compare the two. The circular will tend to give slightly _poorer_ results, as it's designed to let some polarized light through, as some camera's autofocus systems (and ttl metering) depends upon it to get the job done. -- www.mattclara.com |
#6
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Circular Polarizers, A Filter You Need
In article ,
"Fat Sam" wrote: But I've used both the linear and the circular polarisers on my digital and I honestly can't see any difference in the results when I compare the two. Nor should there be if they are the same quality. But under some lighting conditions a linear polarizer will not let the AF or the AE or both work properly if your camera has a beam splitter in the optical system. If you have a camera without a beam splitter then you have no reason to use a circular polarizer. -- To reply no_ HPMarketing Corp. |
#7
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Circular Polarizers, A Filter You Need
In article ,
"Matt Clara" wrote: The circular will tend to give slightly _poorer_ results, as it's designed to let some polarized light through, as some camera's autofocus systems (and ttl metering) depends upon it to get the job done. -- www.mattclara.com No. They polarize exactly the same. All the quarter wave plate does is allow some light to be processed properly by the AE or the AF, or both, systems if your camera has a beam splitter in the optical path. There are other factors that would make one type of polarizer more effective then another. For instance a Kaesmann polarizer, linear or circular, would be marginally more effective as the foil in a Kaesmann is stretched tight in all directions and lies flatter then a simply laminated polarizer. To keep the foil stretched tight the Kaesmann has edge sealed glass rather then just laminated glass. A properly hard coated polarizer with a modern MC that repels dust and moisture while also passing up to 99.9% of the light hitting it to the image plane (less what the polarizer eliminates of course) like the Heliopan SH-PMC coated polarizers will be more effective then a coated, uncoated or Kaesmann polarizer due to the coatings used. As well as the quality of the foils used. There are several grades of polarizers for optical use in photography. Better polarizers use higher grades which are more color neutral and have less effect on resolution then cheaper foils. The less expensive polarizing filters may not be as effective due to the foil quality as well as to the coatings and glass used. -- To reply no_ HPMarketing Corp. |
#8
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Circular Polarizers, A Filter You Need
Matt Clara wrote in news:1186583221.191643.258650
@x40g2000prg.googlegroups.com: On Aug 8, 5:33 am, "Wayne J. Cosshall" wrote: Hi All, snip on the circular polarizer /snip snip I have one, rarely use it. /snip If you're photographing with a wide-ish lens, you might like the effect of the Moose Peterson filter. It's a warm polarizer. I don't use it a lot, but it gives a nice (think Fuji Astia) warm, saturated look to the skies and skins. |
#9
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Circular Polarizers, A Filter You Need
"Bob Salomon" wrote in message
... In article , "Matt Clara" wrote: The circular will tend to give slightly _poorer_ results, as it's designed to let some polarized light through, as some camera's autofocus systems (and ttl metering) depends upon it to get the job done. -- www.mattclara.com No. They polarize exactly the same. All the quarter wave plate does is allow some light to be processed properly by the AE or the AF, or both, systems if your camera has a beam splitter in the optical path. There are other factors that would make one type of polarizer more effective then another. For instance a Kaesmann polarizer, linear or circular, would be marginally more effective as the foil in a Kaesmann is stretched tight in all directions and lies flatter then a simply laminated polarizer. To keep the foil stretched tight the Kaesmann has edge sealed glass rather then just laminated glass. A properly hard coated polarizer with a modern MC that repels dust and moisture while also passing up to 99.9% of the light hitting it to the image plane (less what the polarizer eliminates of course) like the Heliopan SH-PMC coated polarizers will be more effective then a coated, uncoated or Kaesmann polarizer due to the coatings used. As well as the quality of the foils used. There are several grades of polarizers for optical use in photography. Better polarizers use higher grades which are more color neutral and have less effect on resolution then cheaper foils. The less expensive polarizing filters may not be as effective due to the foil quality as well as to the coatings and glass used. Damn, luminous landscape (and what I thought of as common knowledge) once again let's us down: "There are two types of polarizing filters available - linear or circular. Linear polarizers are more effective and less expensive than circular ones. But circular polarizers are needed with just about any camera that has a through-the-lens metering system, or autofocus. The reason for this is that both of these systems use semi-silvered mirrors to siphon off some of the light coming though the lens. If that light is linearly polarized it renders either the metering or the autofocus ineffective. This means that you're going to have to buy circular polarizers unless you're shooting with a pre-1970's camera, or a view camera." -- www.mattclara.com |
#10
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Circular Polarizers, A Filter You Need
In article ,
"Matt Clara" wrote: The reason for this is that both of these systems use semi-silvered mirrors to siphon off some of the light coming though the lens. If that light is linearly polarized it renders either the metering or the autofocus ineffective. This means that you're going to have to buy circular polarizers unless you're shooting with a pre-1970's camera, or a view camera." There is another reason that might effect some systems. And that is any camera that has a polarized system in the viewfinder for display readouts. If the camera has that type of display then as a linear polarizer is rotated some display information may disappear and reappear or be harder to read at some points of rotation then at others. -- To reply no_ HPMarketing Corp. |
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