today i went to calumet here in berlin to buy an IR pass filter. the one i had which was taped together from black photo negative was too transparent for visible light (you could still see a red glare when looking directly at a light source) as well as it blurred the image because of the multiple layers of negative and clear adhesive tape.
the filter i bought is a polyester filter called LEE 10087, which means it is manufactured by LEE Filters, measures 100x100mm and is filter color #87. guess what, it works well. less light than before reaches the CCD chip while the image quality is enhanced.
i used the universities’ laser cutter to cut a ring out of plastic which fits over the lens and i fixed a piece of filter to it using double-sided adhesive tape. looks really professional now.
here’s an image marion shot with a webcam lying around