Polarizer question

[P. J. Alling]

mike wilson wrote:
> P. J. Alling wrote:
>
>   
>> The only problem with a linear polarizer is if the functioning of your 
>> camera depends on a semi-silvered mirror, (most do these days).  If the 
>> meter is behind it, (Pentax LX OM2/4 etc.), you'll get inaccurate meter 
>> readings.  If your autofocus sensors are behind it you'll get inaccurate 
>> or no auto focusing.
>>     
>
> <smug>
> But an LX will still _expose_ properly....
> </smug>
>   
Only in automatic mode.  In manual you'll be mislead. 
>   
>> Cotty wrote:
>>
>>     
>>> Hi team,
>>>
>>> Can someone please give me a rundown on the difference between a linear
>>> and a circular polarizer? If you place a linear polarizer in front of
>>> your lens and rotate it, will that alter the reflections etc like a
>>> circular polarizer will?
>>>
>>> Many thanks.
>>>       
>
> A circular polariser has a depolariser after the polarising filter. 
> Apart from some technical problems (as above) there will be no visible 
> difference to the output if you use either.  The digital advantage of 
> being able to frig about with exposure (assuming a suitable subject) 
> until you get it right comes to the fore.
>
>   


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