Warming filter up in mountains

I am eager to shoot the crater of Haleakala volcano here in Maui.

I went on a hike yesterday to look for good places to place my

camera and observe the lighting. What I see is a tremendous

amount of blue light. I was using very warm polarizing

sunglases and it made a great difference. I own a polarizer with

multicoatings and was thinking of adding a warming filter to

stack it on. I think I will stick with B+H multicoated since it will

reduce unwanted internal reflections. Now the Schneider

website recomends the KR6 for those kind of situations (10000

feet high above the ocean). Has someone used it. It seems to

me most people use lighter filters. Would the KR3 be more

suitable? What's your experience?

I don't have experience with the KR3 & KR6 filters, but I frequently use an 81A here in the mountains of Colorado (9,000 - 14,000ft elevation). As with most things, you can hear what people have to say, and then go experiment for yourself to find out what's really going to work for you.

I used KR3 at higher altitudes in Bolivia a few years ago (13,000 - 17'000 ft). In sunny conditions at 13'000 ft the resulting images were slightly bluish. Any overcast, it's all blue. So next time I'll use KR3 in direct sunlight and KR6 elsewhere.

 

Attached image is at 5150 m (16'900 ft), using polarizer and KR3.<div></div>