81A warming filter on Canon 1-4 IS zoom??

Hi all!
I've recently taken pictures of Chamois, up in the mountains, with an evening light: I used my 1-4 zoom and Velvia pushed one stop. The images, as many among you could imagine, resulted with a strong blue dominance, which bores me...
Since I love Velvia and I'd be not willing to try warmer films (like Kodak ones) I thought about a good 81A filter in front of my lens.
Does anyone have experience with these glasses? Any good brand?

I read that many top pros use always warming filter on their big lenses (inside the barrel...), but I'm worried if this new element (in front of the lens...) could affect the optical quality of my zoom...

Thanks in advance for the answers and have great shots to everyone!

Hi Bruno, a 81A filter has been recident on my lens for the last 18mths. The blue cast occures when subjects are in the shade and on Sensia also. The filter is pretty subtle and does counter the cooler color temprature. I use the multi coated Hoya filters.
On the 100-400 screw it on the front as per normal. On long lens, a filter holder is usually used to slot the filter into the barrel of the lens asyou can imagine the cost and practicalities of a filter that have a diamenter of say 4.5inches-6 inches.
Hari

Hi Bruno, a 81A filter has been recident on my lens for the last 18mths. The blue cast occures when subjects are in the shade and on Sensia also. The filter is pretty subtle and does counter the cooler color temprature. I use the multi coated Hoya filters.
On the 100-400 screw it on the front as per normal. On long lens, a filter holder is usually used to slot the filter into the barrel of the lens asyou can imagine the cost and practicalities of a filter that have a diamenter of say 4.5inches-6 inches.
Hari

Bruno,

About 6 years ago I noted that when I used a generic 81A warming filter with an 80-200 f2.8 Nikon lens and F4 camera that the camera occasionally could not autofocus. After replacing the filter with a Nikon A2 filter (equivalent to 81A) the problem went away. Now the only time I remove my A2 is when I add a polarizing filter or when I transform my telephoto into a great macro lens with a Canon 500D two-element diopter. Even when I am shooting in warm light I like the effect the A2 adds to Velvia.

If you want both warming and polarizing, the Moose filter is the way to go.

I have 81A's on ALL of my lenses.

For the situation you describe, an 81A is probably not enough warming. An 81B would probably serve you better in eliminating the blue cast you get in deep shadow or on overcast days. But as to your question, there is no reason an 81A wouldn't work well on the 100-400. I would suggest a good quality multi-coated filter.

Thanks a lot guys for all the very useful informations!!
I think I'll go with an Hoya HMC...!?

This place rocks!!!

I think I'll go with an Hoya HMC...!?
[/quote]

That is what I use - they are excellent filters and also very narrow so you don't have to worry about vignetting if you ever use it on a wide angle lens.