Did my first H&D curves with the EG&G.

I exposed a strip of film to each setting on the EG&G. The first segment was 10-2 with my filter with 3 wide slits. Next was 10-3 with the filter with 2 narrow slits and finally 10-4 with no filter.

Now, I don't have a flash meter. So I use my eye to match the intensity of the 10-4 flash to the others and kept scratching lines in the black paint on the filters until the intensity matched up to my eye. I thought I could get to 1 to 2 stops.

Well, I plotted the three H&D curves and they almost superimpose exactly! WOW!

Here is some of the raw data:

[Step #] [10-4 (no filter)] [10-3 (3 wide slits)] [10-2 (2 narrow slits)]

18 1.32 1.31 1.31
17 1.38 1.38 1.38
16 1.47 1.46 1.45
15 1.56 1.54 1.54
14 1.65 1.62 1.62
13 1.74 1.70 1.71
etc...