Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: pcox on January 26, 2010, 07:22:52 pm

Title: B&W 486 filter for correcting colour casts with extreme ND filters
Post by: pcox on January 26, 2010, 07:22:52 pm

Hi folks -
Has anyone used the B&W 486 filter to balance out the warm colour cast you get with very dense ND filters (6 stops and above)?

I'm curious to try it, but the filter is expensive and B&W don't recommend its use with lenses that have a greater than 60 degree angle of view. Has anyone used this filter in conjunction with a, say, 10 stop ND filter and a 24mm lens?

Cheers,
Peter

Title: B&W 486 filter for correcting colour casts with extreme ND filters
Post by: uaiomex on January 27, 2010, 12:07:34 am

I haven't used this combination but I would not think on trying it either. Very dense ND filters degrade images to some small extent. Putting another on top would make things worse. if you shoot raw you can compensate most or all of any color cast.
Eduardo

Quote from: pcox

Hi folks -
Has anyone used the B&W 486 filter to balance out the warm colour cast you get with very dense ND filters (6 stops and above)?

I'm curious to try it, but the filter is expensive and B&W don't recommend its use with lenses that have a greater than 60 degree angle of view. Has anyone used this filter in conjunction with a, say, 10 stop ND filter and a 24mm lens?

Cheers,
Peter

Title: B&W 486 filter for correcting colour casts with extreme ND filters
Post by: Bart_van_der_Wolf on January 27, 2010, 02:53:07 pm

Quote from: pcox

Hi folks -
Has anyone used the B&W 486 filter to balance out the warm colour cast you get with very dense ND filters (6 stops and above)?

It won't change a warm colour cast, it rejects UV and IR light, and passes visible light.  It is sensitive to introducing a color cast vignette, because at oblique angles the efficiency of the coating shifts to different wavelengths.

Cheers,
Bart