IR Contamination - DSLR

[Winston2012]

hi,

In my search for ND fliters and so forth I ran into information about IR contamination of digital (mostly CCD) chips. I can't find anything that says DSLR's need this protection for video.


Please help....

(PS - on my last post I tried to respond to all the kind input but must have done something wrong - it didn't post)

 

[Samuel H]

nearly every camera out there has an IR filter in the sensor itself, so this shouldn't be an issue
still, there may be a little amount of contamination with strong ND filtering, see here, in the Tiffen section: http://www.hurlbutvisuals.com/blog/2010/02/filtration-beware-of-the-reaper-of-cheap-glass/

 

[Winston2012]

That link is interesting - great info...


Also, what do you know about DSLR's having weak blue reproduction? I heard that buying an 80c filter (desinged for WB) can 'help' the weak chip produce better blues with less noise. And if that's so, how do you do it?

Do you white balance - then put the filter on - knowing everything will have a blue cast? Then fix in post?

 

[Samuel H]

never heard anything about that

this may be interesting to you: https://vimeo.com/47394255

 

[Winston2012]

Thanks Samuel - keep those videos coming

I was watching a video from AbelCine EXPO ( I got the link from a poster here when I searched NDIR Filters - now I can't find the full video link). The video was over 2 hours long if I remember correctly. Anyway, they were discussing different glass filters that should be used while shooting - or - another way - don't try to fix digitally in post what should be fixed with a glass filter while shooting.Trying to duplicate certain things in post will result in poor/noisy IQ. One of the recommendations was to use a 1/4 blue filter (80c) to "help" digital sensors that are inherintly weak and noisy in the blue spectrum.

So my question is, if thats true - how do you use the filter in the field?
Do you white balance with no filter - then screw-on the filter, thus causing an intentional blue oversaturation that will "help" boost blues - then - fix in post?