Kodak Ektachrome EDUPE

[laptoprob]

Anyone ever used this? I expected some sensitivity info on the package but that is very 'secret-handshake' intel.
Appearantly it is a low contrast high sharpness slide duplicating film, suitable for use in cameras. Therefore it should be possible to use as regular slide film.
Development is E-6. It has a EI 16 on the pack. I guess that's exposure index. Not what that is like compared to ASA, DIN or ISO.

Anyone knows? Otherwise I will have to call Kodak about it...

Thanks, Rob.

 

[tetrisattack]

The other day my friend brought me a scavenged 100' roll that had expired in 1999 (so it might not be the same film!). I wanted to know the same thing, so I did a bracket test. I found it to be about ISO 40-50 with a tricky color cast. The slides are too warm under tungsten light but too cold outdoors; it's probably designed to be exposed under high-temp light from a quartz lamp or possibly studio strobes. Some of that color cast could have been due to its age.

I believe the difference between it and regular slide film is that, while regular slide film is designed to capture the full color range of what your eye sees, edup is designed to capture the tonal gradient of developed ektachrome dyes.

In any case, the white balance is whacked and it might have a rough time seeing the difference between purple and blue. 🙂

On the attachments, left to right, I didn't take notes but here's what I remember:
Tungsten: Base exposure is ISO 50, 1sec, f/2.8; brackets are from ISO 200 to ISO 50.
Daylight: Base exposure is ISO 50, 1/125th sec, f/2.8; brackets are 50, 100, 64, 50, 25.

 

[Doug]

As a slide-duping film it's likely to have quite low contrast, so as not to boost the existing contrast in the material being duped. EI is Exposure Index", same as ISO but without the official blessing... and approximate suggestion in other words! (When someone says they shot Tri-X at 1280, the situation is that the ISO is 400 and their EI is 1280).

 

[laptoprob]

Thanks a lot both, Like I stated, on mine it says EI 16. Besides it is noted +10C and +20Y.
Tetrisattack, what was the Exposure Index on yours? Did you have it developed or is there a way to do it yourself?
Could I correct this blue cast with a yellow filter? And a little cyan I guess, but that is not as easy to try.

Thanks in advance, Rob.

 

[tetrisattack]

Hey, sorry for not replying earlier, this thread got pushed off the front page too quickly. 🙂

My can had the EI40 label but I tested it a bit slower too to account for speed loss due to age. If I remember correctly it suggested +20Y. I think we've got different films but you can probably expect similar results. I called ahead to my lab and asked if they accepted bulk-loaded rolls of film, and they said no problem so long as I warn them beforehand so that my masking tape doesn't muck up their machine.

You could color-correct by filtering but to do it properly you'll probably need a special set of filters, like the kind they use for color enlargers. I'm willing to bet that the +10C +20Y refers to wrattens/gels and not the common screw-in filters you use for b/w photography, but you could try a medium yellow filter, that would certainly get you closer.

After the above test I decided to save my edup for special effects, uncorrected it's got a very cold tone outdoors, and it might be even more interesting yet when cross-processed... 🙂

It goes without saying though that if all you wanna do is get a nice, neutral image, it's probably more effective to just get real slide film.

 

[laptoprob]

Thanks again for the info. I will do a test roll with medium yellow to try to correct the blue cast.

Rob