Talk to me about Polarising Filters

Quick question. I have a 58mm Hoya HD circular polarizer on my 50mm f1.8G, mouted on my D750.

When using this in bright conditions (see the latest 2 shots on my flickr) the ISO (on auto) jumps as high as ISO 2000.. Not sure why? As soon as i fix it to my lens the ISO takes a massive hike.

Had no such problem with the 52mm polarizer (also Hoya) I was using on my 35mm f1.8G on my old D7100? All sunny conditons were ISO 100 with the filter attached..
 
Since both images have the same shutter and aperture, is your minimum shutter speed in auto ISO settings fixed at 1/4000s? If left to auto, my nikons have always defaulted to 1/focal length when auto ISO kicks in and starts ramping it up.
 
Steve M said:
Quick question. I have a 58mm Hoya HD circular polarizer on my 50mm f1.8G, mouted on my D750.

When using this in bright conditions (see the latest 2 shots on my flickr) the ISO (on auto) jumps as high as ISO 2000.. Not sure why? As soon as i fix it to my lens the ISO takes a massive hike.

Had no such problem with the 52mm polarizer (also Hoya) I was using on my 35mm f1.8G on my old D7100? All sunny conditons were ISO 100 with the filter attached..
Click to expand...

Are you using Auto ISO with a minimum shutter speed applied?
 
12,800 max. Just had a look at some shots i took in broad sunny daylight without the polarizer and the camera selected an ISO of 800?
 
That is very peculiar behaviour for auto iso. Out of interest, at 800, what shutter speed was it trying to give?

Best bet is to keep an eye on it and shut it off as and when it does stupid things like this as you don't need 1/4000s when using a 35mm lens.
 
Would 'Easy ISO', which was on, have an effect on this?

I've just turned it off and taking a shot handheld indoors at f/5.6 (admittedly with sunshine streaming in through the window) was giving an ISO of 100..

Not tried again with the polarizer yet, but this is a lower ISO than i was getting outdoors in sunshine the other day without it..
 
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Never seen "Easy ISO" before, but from what I've read, it seems that it places ISO on one of the dials leaving the other to aperture in A. It's not a mode I've ever found before on any of my nikon's so I've never tried it.
 
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