[OM] OT how to tell polarisers apart

[James Royall]

I have a vague memory of reading about this, but no idea where. I have 
a polariser of unknown type and have realised I need to ensure it's 
circular before using it on my OM4. Is there a trick for doing this?

Thanks,
James

Who still has to scan his TOPE entry! Sorry Olaf


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