09-25-2010, 03:57 PM
[quote name='Sylvain' timestamp='1278338527' post='833']
Ho Walter, very kind of you.
As confused as I may have looked, I was well aware of these differences in mfr. definitions <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />. The shop just oddly proposed me a ND8 Dorr while I was actually looking for 10 stops reduction and for a second I just thought they said stops. Surely, if you don't pay attention, and as you mentionned indeed, you can mix 8 times with stops.
I ordered a B+W ND110. I was aware of the red cast but haven't thought much about it yet. I thought I'd see in field conditions. I have a white balance card but I was somehow thinking that it wouldn't actually correct for such a cast. My very early thinking was that it was filtering other colors much more than the reds, which in my intuition was slightly different than the light temperature-induced color cast. Maybe I'm missing something here?
Thanks in advance for any clarification !
[/quote]
Right, you have to be careful. as the curves show, these filters don't absorbe so well in the red, infrared range, so you get partial infrared results, more difficult to correct.
Ho Walter, very kind of you.
As confused as I may have looked, I was well aware of these differences in mfr. definitions <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />. The shop just oddly proposed me a ND8 Dorr while I was actually looking for 10 stops reduction and for a second I just thought they said stops. Surely, if you don't pay attention, and as you mentionned indeed, you can mix 8 times with stops. I ordered a B+W ND110. I was aware of the red cast but haven't thought much about it yet. I thought I'd see in field conditions. I have a white balance card but I was somehow thinking that it wouldn't actually correct for such a cast. My very early thinking was that it was filtering other colors much more than the reds, which in my intuition was slightly different than the light temperature-induced color cast. Maybe I'm missing something here?
Thanks in advance for any clarification !
[/quote]
Right, you have to be careful. as the curves show, these filters don't absorbe so well in the red, infrared range, so you get partial infrared results, more difficult to correct.