Originally posted by angerdan Lineare und zirkulare Polfilter
Welcher Polfilter ist richtig ? linear oder zirkular? » Objektive24.de Blog
Der Polfilter in der modernen Digital-Fotografie - nützlich oder überflüssig? - gwegner.de
Wie funktioniert ein Polfilter? - Objektivfiltertest
Polarisationsfilter - Mythos und Praxis
First one: 2005-2009, no evidence quoted/linked
Second one: 2012, no evidence
Third one: 2015, no evidence, though there's an evidence-free assertion in the comments that "really modern
mirrorless system cameras work perfectly with linear polarizing filters" (my italics)
Fourth one: no reliable date that I can see, no evidence
Fifth one: 2016, no evidence
Originally posted by angerdan Again, basics like aperture or PDAF sensors don't change much
Which is not quite the same as saying they don't change at all... Maybe a "minor change" is that they now work OK with LPL filters.
Originally posted by Digitalis My own experience with Linear PL filters used on Canon, Nikon,Leica and Pentax AF cameras proves the explicit requirement for a circular polarisers for accurate AF and AE are long behind us. .
Hooray, there's at least two of us who've actually tried it then!
Originally posted by Digitalis There have been only a handful of cameras where that caveat applied.
Is it possible to give an example or two? Is this fairly historical now or are there any current models out there?
Originally posted by kaseki OK, I'll bite, being old. On page 71 of the 645N Operating Manual, a paragraph on polarizing filters concludes with: "Use a CIRCULAR POLARIZING FILTER for proper autofocus operation."
Thanks for that. So the manufacturer themselves recommended it, on a camera introduced in 1997; I've just checked the PDF manual for the 645N II (2001) and that repeats the advice, on page 85. That gives us a reference point to work from.
This is probably one of those debates where the answer is more interesting than useful, as it appears fairly unlikely that any of us is going to be caught out by using an LPL filter on a camera old enough to be affected. But I'm still interested to know when the advice was first given, by whom, and when (or more usefully, for/from which models) it became irrelevant.
Cheers
Jonathan