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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 06 Feb 2008 (Wednesday) 17:25
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Polarized Sun Glasses + Lenses + CPL's

 
MaxxuM
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Feb 06, 2008 17:25 |  #1

I broke my last pair of glasses and had to order a new set so I thought I would also get a pair of sun glasses since transitions just are not enough to block the sun .... Well, I got home and realized they may effect my shooting with and without a CPL on my lenses since these sun glasses will be polarized. Can anyone tell me what I may experience with these glasses???




  
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argyle
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Feb 06, 2008 17:44 |  #2

Other than making the image in the viewfinder appear darker to your eyes (I assume that you'll be wearing the glasses?), it won't have any effect on the picture taking.

Edit: To clarify, the glasses will not have an effect on what reaches the sensor.


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Feb 06, 2008 17:53 as a reply to  @ argyle's post |  #3

I realized this problem back in the early 1980's. The scene looks great to you, you shoot it, then it looks nothing like you saw when you process the image. because you were wearing polarized sunglasses at the time.

Since then, when shooting with sunglasses outdoors, I always remove the sunglasses then view, compose and take the shot. No more disappointments...at least not from wearing the sunglasses. :lol:


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xarqi
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Feb 06, 2008 18:09 |  #4

1) The viewfinder won't suddenly be black if you use both a CPL and your glasses, regardless of the CPL rotation angle. (The glasses are linearly polarised, the CPL circularly.)
2) There is a slight additive effect in that you will be seeing only the component of the circularly polarised light passing through the viewfinder that is also polarised in the plane of your glasses. You'll see a mildly exaggerated polarisation effect on reflections and saturation, and a slight decrease in brightness.
3) You may see some "rainbow" artifacts through the viewfinder. I'm not sure of the source of these. They may derive from stresses in the plastic lenses of the glasses (in my case - yours may be glass and the same thing might apply), or in the focus screen (my best guess), or some issue with internal reflections. These are a minor annoyance.
4) Wearing the glasses gives you a great preview of what the scene will look like with a CPL, but as noted, if you are not using a CPL, this may be misleading.




  
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MaxxuM
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Feb 06, 2008 18:19 |  #5

Thanks guys... I guess I'll see what happens this weekend while I'm shooting outdoors with the CPL.

Xarqi, #3 makes sense. I remember my polarized shooting glasses while I was a sniper did have that rainbow effect while looking out of tinted windows. I'm a little worried about this.

I'm figuring that I will 'see' the scene with my glasses and not rely too much on what I see in the view finder then. So, there shouldn't be too much problem judging what will happen when looking through the viewfinder while rotating the CPL then?




  
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xarqi
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Feb 06, 2008 19:27 |  #6

Shouldn't be too much problem. In practice, if you can, just bump your glasses onto your forehead while you look though the viewfinder. If they are prescription lenses that might not be feasible of course without repeatedly tweaking the dioptric adjustment on the VF.




  
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piggy
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Feb 06, 2008 19:39 |  #7

I found it difficult to read the viewfinder information when using my polarized sunglasses.




  
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dmspelic
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Feb 06, 2008 21:02 |  #8

What matters is whether the light you view in your viewfinder has polarimetric properties that your polarized glasses can affect. Light can be partially polarized by reflections (which is why polarized sunglasses reduce glare of course). You may therefore see affects in the viewfinder that differ from what you would see without them.


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Polarized Sun Glasses + Lenses + CPL's
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