Warming filters

I know this is a bit off topic (not directly Leica related) but this is just such a great forum so I´ll give it a try. I am shopping for a warming filter to use for my color photography. I use fuji Provia 100F and Velvia and do experience blue color casts in photos taken in the shade (especially if it´s a blue sky day), what kind of filtration do you guys use for this situation?

Also can anyone recommend a good book on color photography (especially color temperature and filtration.

Thanks.

Get an 81B. The 81A isn't really strong enough and the 81C is too

warm.

Both B+W & Heliopan make a KR series. Personally, I much prefer these

to the 81 series, which are a little to yellow for my taste. I'd

start with the basic KR 1.5 which is what they call a skylight

filter. The color seems to be slightly salmon.

I too use the multicoated B+W KR1.5 filters. They are of excellent

quality and will not degrade image quality........

B+W KR3 is a very special warming formula, and it works very well for

taking the blue cast out of images lit by large area of sky.

Jonas: I concur with 81 series A through D depending on how much

correction you need - for correcting blue. If you're under trees where

there also some green, then the Skylight (which is pinker) may do

better. To my taste the KR 1.5 filters are nearly indentical to 81a

filters and I use them interchangeably (since Heliopan is the only

filter brand sold around here in 39mm/60mm and other weird Leica

sizes).

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While we're on the subject, let me throw in a related question that

isn't worth a thread of its own.

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I recently came across the following 'warming' filter; 39mm, chrome

mount, marked E. Leitz - 39mm - CF.

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It is a very pale warming filter, slightly stronger and more yellow

than an 81-series filter (but definitely NOT a yellow filter as might

be used in B&W photography). It is also not intense enough to be a

daylight/tungsten correction - and seems too far towards yellow to be

a Kodachrome A/tungsten convertor.

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Fairly clearly a pre-1970/probably pre-1960 filter of some kind. Does

anyone know what it is? (I've tried the big red Leica collectors guide

- millions of filters - none close to this.)

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Seems like the CF might stand for Color Film or Color Flash or some

such.

You can do a lot of warming with a skylight filter. A direct

comparison with and without the skylight filter on an overcast day

will reveal a very strong difference. When even more warming is

needed, the Tiffen 812 acts like a heavy-duty skylight. There is the

question, of course, of whether one wants to use a Tiffen filter on a

Leica. I'm no filter snob, but I do have reservations about that.