polariser
Also, Polarisers come in two forms, Linear and circular; this refers to the type of Polarisation not the shape of filter.
Most AF cameras cannot use Linear Polarisers due to the effect the polarisation has on the AF detector, this does not apply to Pentax AF systems

Linear polarisers are much cheaper than circular polarisers, if you can find one.
The only issue you may have is seeing the effect in the viewfinder, much more obvious using live view.
Davex.
K5 + 8mm-500mm zooms and primes
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A linear polarizer will cause erroneous readings on a Pentax LX in manual mode.
Chris
Bring back the latent image!
By turning the filter whilst looking through the viewfinder you could see the effect.
I don't think circular ones show this, which could make them awkward to use.
Cheers, HG
K110+DA40, K200+DA35, K3 and a bag of lenses, bodies and other bits.
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Regards
David
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Some cameras, some lenses, some bits 'n' bobs
Most AF cameras cannot use Linear Polarisers due to the effect the polarisation has on the AF detector, this does not apply to Pentax AF systems

Okay, this is contrary to what I read almost everywhere on the web. Are you saying my GX-10 can use a Linear Polarizer?
Twitter | Someone said time-lapse?
Whenever possible I prefer to use linear polarizers for their more pronounced effect.
A linear polarizer will cause erroneous readings on a Pentax LX in manual mode.
Chris
Well done! I thought I was the only person around here who knew that

Linear PLs work perfectly well on Pentax cameras.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
[link=https://500px.com/will_brealey/[/link]
Whenever possible I prefer to use linear polarizers for their more pronounced effect.
A linear polarizer will cause erroneous readings on a Pentax LX in manual mode.
Chris
Well done! I thought I was the only person around here who knew that

Linear PLs work perfectly well on Pentax cameras.
I'm curious as to what the problem with the LX in manual mode is? Largely because I am a LX user that often uses a polariser, although I think all mine are circular. I often wondered if circular ones were less effective as I remember how much difference the linear one made with my ME Super back in the day.
Thanks, Kris.
Kris Lockyear
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.
My website
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
Kris.
Kris Lockyear
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.
My website
davem
Member
yorkshire
Dave