Gear Talk > Lenses

How to reduce the nd filter warm color cast?

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Marsu42:
I'm about to buy the Heliopan 2093 nd filter with 3.0 density. The manufacturer states (German: http://www.heliopan.de/produkte/graufilter.shtml) that this density produces a warm color cast that can be removed by "adding a Heliopan UV/IR filter in front of the ND filter".

Now I'm confused: a) all I find are UV *or* IR filters, what is the manufacturer talking about and b) does this work & is it necessary or is it trivial to remove the warm color cast in postprocessing?

Thanks!

neuroanatomist:
The warm tone can be easily removed by adjusting the WB in post.  I wouldn't stack another filter to get there...

GMCPhotographics:

--- Quote from: Marsu42 on February 10, 2013, 03:22:20 PM ---I'm about to buy the Heliopan 2093 nd filter with 3.0 density. The manufacturer states (German: http://www.heliopan.de/produkte/graufilter.shtml) that this density produces a warm color cast that can be removed by "adding a Heliopan UV/IR filter in front of the ND filter".

Now I'm confused: a) all I find are UV *or* IR filters, what is the manufacturer talking about and b) does this work & is it necessary or is it trivial to remove the warm color cast in postprocessing?

Thanks!

--- End quote ---


Sometimes the warm effect can be quite nice. I find the Heliopan warmth to be the most agreable of the ND colour casts. Yes in an ideal world there wouldn't be any....but in reality a little warmth can add a nice effect which is slightly more attractive than dialing it in via WB. I've yet to see an ND filter which doesn't have a colour cast and I've tried a few!
To remove, shoot raw and use WB select tool and choose a pure white item in the frame. Then tune the WB a little according to your eye and taste.

wayno:
I find the charcoalley cast from my Hoya ND400 9 stop to be actually rather challenging to correct for. To deal with the tone it imparts, it's more than just WB. It's not unpleasant, just distinct.

Menace:
Personally, not a fan of stacking filters - LR to fix warmth :)

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