A2 49mm-62mm adapter

Started Mar 5, 2004 | Discussions thread
PeteGanzel
PeteGanzel Senior Member • Posts: 1,417
OT: Polarizers and IR

Hi Jens:

I just checked your site and now you have a section on using polarizers as variable "ND" filters. Why don't you start a new thread on this since we have strayed far from the original posters question on filter adapters.

Anyway, I too noticed this IR effect by accident and found this graph of the spectral transmission of two crossed polarizers;

The IR passed is mostly above 800nm, and does not include the near red IR that the R-72 takes advantage of with D-7. Shots taken with the D-7 have a purple cast and are similar in appearance and exposure to those taken with the later Dimage cameras. The little blue that is passed is also significant.

Here's a shot with crossed polarizers on a D-7;

Thanks again,

Pete

http://www.pbase.com/pganzel

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