Cameleon
Second Officer
Flight distance : 60394 ft
United Kingdom
Offline
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Linear isn't compatible with some SLR focus/exposure systems as they use mirrors to syphon off some of the light (via polarisation) and that splitting of the light can take the light from the angle that has been polarised and hence cross-polarised, which reduced/removed to a point where it can't focus or get the exposure right. It can be like stacking one polariser on top of another. Another way to see this is take an iPhone and turn your CPL around it. One angle you'll see the screen is black or almost black. This is because the iPhone screen itself has a polariser and if your CPL then is at 90 degrees to it, you'll get cross polarisation and no light. The linear PL and AF/AE beam splitting in SLRs can do the same and hence the AE/AF systems don't get any light to reference.
I'm not 100% certain, but I don't think this is a problem with 'live view' systems that take these readings straight off the sensor, which I assume is what the OP does (like a mini mirrorless camera).
On the Pgytech site, I can't see it mentioning that the ND/PL is specifically a linear PL, just it doesn't call it a CPL, but thats not to mean its not a CPL. I'm sure you'll have no issues with Pgytech anyway and they wouldn't release a filter that wont work with the AF/AE systems on the OP.
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