scott_bartlett Posted June 4, 1999 Share Posted June 4, 1999 Has anyone had any luck with cutting the fogging of Kodak High SpeedInfrared film by either: - cutting the amount of IR emitted by the sprocket sensor - making the sensor smaller by filling in the hole with an IR opaque material <p> If someone from Canon is reading this, I'd be real curious why thedesign tradeoffs were so heavily weighted against the use of IR filmin these cameras. It seems to me that by restricting the opening ofthe IR sensor to the upper half of the sprocket hole, and cutting thelight output, the halo fog wouldn't intrude into the image area nearlyas much. <p> On my ElanIIe, I get fog that extends about 7mm into the imagearea. Interstingly enough, the lower edge of the raised plasticblock that the IR sensor is surrounded by lines up almost perfectlywith the stripe along the upper edge of the film that has D-max.This line also happens to line up pretty closely with the edge of theimage area on the film. (for those keeping score this is about 1.3to 1.4 cm of fogged film - 7mm that is D-max in the sprocket area, and~7mm that drops off in density dramatically 1-2mm below the edge ofthe sprocket holes; tapering off to zero about 1.3-1.4 cm from theedge of the film. Obviously this cuts the usable area of my negativedown too far. Link to comment Share on other sites More sharing options...
bobatkins Posted June 14, 1999 Share Posted June 14, 1999 I don't have a fix, and I've never heard of one. I presume the reason Canon didn't really address the issue of IR film is that less than 1% of EOS users will use it, maybe less than 0.1%, so it's just not a marketing issue. IR capability won't get them many (if any) extra buyers! <p> My suggestion would be to find an used older body with mechanical sprocket sensing. The early Rebels are fine, as are the 600 series and RT bodies. Alternatively, Konica 750 is reported to be fine in the IR sensor bodies, though of course it is slower than the Kodak emulsion and has a more limited IR spectral sensitivity. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now