Neutral Density Filter Colour Cast

none of the good ones are cheap, and if they're anything like my cokin filters, they're pretty easy to scratch, too

Bret

I have got same filters hold them up to light thet are full of blemishes . Stupid really spend to get good lenses then put crap on the front

Hi,

I've recently bought the new version Hitech 10 stop, and yes they have cured the magenta cast. They've replaced it with a blue cast instead !

Wow, that's even worse than stacking cheap cokin lenses. What brand were these so I know what to avoid?! Nothing you could have done about it.

Lee, B&W or Singh-Ray produce the finest filters, but they're all extremely expensive, and with Lee there's a massive waiting list.

I read something about this, after having some trouble with Cokin filters when stacked. It seems that some ND filters block visible light but not infrared, so the balance between visible and IR light is thrown out of whack, leading to a magenta cast. You can set a custom WB to compensate for it, or you can correct it later if shooting RAW, which is what I do if I am stacking them. Stacking cheap ND grads doesn't work at all, as the cast ends up just on the top of the image. I have hardly used my Cokin filters for ages, must get some better ones....

There's an explanation of it here

Looks like there isnt a way of getting hold of good quality filters without spending a fortune- from the Lee website it appears they are struggling to meet demand and this has been the case for a while. The results from welding glass are better than these and very cheap.

I recently bought a Hoya ND400 that has an ever so slight cast.
In the past I did some playing around with two linear polarizers and got a cast similar to the op's but more blueish (which can be interesting nonetheless).

Prieni

From the information i've gathered together ,ND filters do seem to create a colour cast regardless of quality (i stand to be corrected on this) which i gather can easily be sorted in PP as long as you shoot RAW . I used a 49mm B+W 10 stop ND and it produces CC on long exposures .