Hi Greg, the way that I read IC-Racer's tests on the LED Blue/Green Sensitometer's via the Photrio threads was that they performed properly for him in regards to the full range of tests and validated across multiple films and developers. I assume he had to figure out exposure time and illumination or he could not have constructed the characteristic curves. It would be good for IC-Racer to comment on this specific thread for clarity.

I am a novice at this, so I may be missing something or possibly misunderstanding?


Quote Originally Posted by Greg Davis View Post
The blue and green X-ray sensitometers will be useful for comparing different films, but may not be full spectrum enough for contrast index, accurate film speed, etc. And they may not have a means of measuring illuminance. There are three EG&G units on ebay right now that are 5500K flash units and discussed in IC-racers threads on Photrio. They may need work on the electronics though.