Just got an EG&G Sensitometer

[Kino]

I just found my clean copy of the manual. Please PM me with your email address and I will send you a copy of the PDF.

 

[ic-racer]

Found this picture from 2006 or so of the replacement lamp I sourced. The one still mounted on the plug-in base was the original. The new one is "U" shaped.

 

[Captain Pete]

Kino, do you still have a copy of that manual available to share?

 

[ic-racer]

 

[ic-racer]

In post #143 above I show the EG&G attenuation filters I made myself. This was in 2007 when I made them.
I never did show the confirmation data, so here it is. This shows 3 line-plots of step-wedge data from the same strip of film exposed under the three conditions (1/10,000 & no attenuator; 1/1,000 and it's attenuator, 1/100 and it's attenuator)

If the attenuators bring the light level to the same density, the lines will all be the same vertical height on the plot as indicated by nearly identical "y intercepts."

 

[Bill Burk]

Except for reciprocity law failure!

 

[ic-racer]

Except for reciprocity law failure!

That is the thing here. If one wanted to test for that (as Edgerton did) one would actually need to go to the calibration shop (as Steve did) and get the Lux-Sec (MCS) values for each of those conditions.

In my case I wanted them to all be the same because all my testing is by comparing two films under the same conditions. I'm not testing for high speed reciprocity. I want to take it out of the equation.

I did find a calibration lab near me, still waiting on hearing back from them on their "quote." On thier "quote" form it did ask "How many units need calibration per year: 1-100, 100-500, Greater than 500" so I'm not sure if they will respond to my inquiry.

 

[Bill Burk]

I mean that when you use the three speeds, with your well-matched attenuators, you really are performing a reciprocity study. Even as you match the curves up at one point, the curves will vary because of the different exposure times. It looks like it's not very significant on TMAX between 1/100 and 1/10,000