What happened to the polarizing filter?

Wheatfield · 12-20-2020, 11:56 AM - **1 Like**

Originally posted by barondla

You are correct, it doesn't seem to affect the meter much, if at all, on the 645Z. Wouldn't a linear polarizer theoretically have better optical quality since it has 1 less optical element?

Thanks,
barondla

Still amazed that a filter wears out. Do other filters?

Theoretically, probably yes. I expect in practice, probably not.
Having said that, a cheap material circular polarizing filter, like any cheap filter, will have a more detrimental effect on the image than a more expensive one made with better glass and polarizing screen.
I've bought Breakthrough polirizers for my *50 and *85 lenses. Stupid expensive, but they don't degrade image quality at all.
I expect any filter that is using some sort of dye could fade over time.

EnglishBob · 12-21-2020, 05:44 AM - **1 Like**

My polarizing filter Ray Bans see 1000 times more direct sunlight than any filter I own. Never heard of sunglass lenses breaking down before the frames though.

tryphon4 · 12-21-2020, 12:42 PM - **1 Like**

Originally posted by EnglishBob

My polarizing filter Ray Bans see 1000 times more direct sunlight than any filter I own. Never heard of sunglass lenses breaking down before the frames though.

There are a variety of methods of polarizing light so it could be complicated to compare several polarizing devices:Physics Tutorial: Polarization

EnglishBob · 12-22-2020, 05:24 AM - **1 Like**

Originally posted by tryphon4

There are a variety of methods of polarizing light so it could be complicated to compare several polarizing devices:Physics Tutorial: Polarization

Entropy always wins

tryphon4 · 12-22-2020, 11:04 AM - **1 Like**

Yes, entropy cannot decrease. Isaac Asimov wrote an interesting novel about this subject.

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12-20-2020, 11:56 AM - 1 Like	#16
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 14,848	Originally posted by barondla You are correct, it doesn't seem to affect the meter much, if at all, on the 645Z. Wouldn't a linear polarizer theoretically have better optical quality since it has 1 less optical element? Thanks, barondla Still amazed that a filter wears out. Do other filters? Theoretically, probably yes. I expect in practice, probably not. Having said that, a cheap material circular polarizing filter, like any cheap filter, will have a more detrimental effect on the image than a more expensive one made with better glass and polarizing screen. I've bought Breakthrough polirizers for my 50 and 85 lenses. Stupid expensive, but they don't degrade image quality at all. I expect any filter that is using some sort of dye could fade over time.

12-21-2020, 05:44 AM - 1 Like	#17
EnglishBob Senior Member Join Date: Apr 2016 Location: Maryland Posts: 159	My polarizing filter Ray Bans see 1000 times more direct sunlight than any filter I own. Never heard of sunglass lenses breaking down before the frames though.

12-21-2020, 12:42 PM - 1 Like	#18
tryphon4 Senior Member Join Date: Apr 2011 Location: Drome, France Posts: 243	Originally posted by EnglishBob My polarizing filter Ray Bans see 1000 times more direct sunlight than any filter I own. Never heard of sunglass lenses breaking down before the frames though. There are a variety of methods of polarizing light so it could be complicated to compare several polarizing devices:Physics Tutorial: Polarization

12-22-2020, 05:24 AM - 1 Like	#19
EnglishBob Senior Member Join Date: Apr 2016 Location: Maryland Posts: 159	Originally posted by tryphon4 There are a variety of methods of polarizing light so it could be complicated to compare several polarizing devices:Physics Tutorial: Polarization Entropy always wins

12-22-2020, 11:04 AM - 1 Like	#20
tryphon4 Senior Member Join Date: Apr 2011 Location: Drome, France Posts: 243	Yes, entropy cannot decrease. Isaac Asimov wrote an interesting novel about this subject.

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