Quote Originally Posted by van eynde ludo View Post
Wie kan me vertellen welke type of zwaarte van wratten filter ideaal is voor de infra-rood film van Efke de 820 aura.
En waar ze nog te kopen zijn natuurlijk.
Heb tot nu altijd met een x8 cokin filter gewerkt , maar heb nieuwe inlichtingen ontvangen , waarbij de wratten filter rechtstreeks was ingebouwt in het toestel en zo betere geeft.
De specs zijn:
Efke AURA IR820 35mm Black and White Infrared Film is a medium speed infrared film with the same configuration as Maco IR820C film. It is available in several formats up to 4x5" and it features a spectral sensitivity of 820nm.

If you use this film with a dark or opaque red filter, you'll find your foliage and clouds go pure white while sky and water will be deep black. The lack of the anti-halation backing will create a halo around your highlights.

Note! Testing of this brand new emulsion has shown that best results are obtained by exposing the film at ISO 25 and using an infrared filter such as a Hoya R72, Tiffen #87 or B+W 092. (Standard Red 25A filters are not recommended).

Skin tone (warm) and lips reproduce as white
Near-infrared results are obtained by exposing the film at ISO 25 with a Red 25A filter. Aperture f/16 Shutter speed 1/30th second
Use for pictorial applications, such as architecture, landscape, portraiture


PS. Laat het door google vertalen als dat beter uitkomt.