I think that’s a good summary, AZD found underdeveloped negatives while being careful to control the main factors that affect development.So in summary, I think, your conclusion is that the "new" D76 needs 30% more development time than the old.
By the way, @Bill Burk, the two stacked f/11's were more dense than the f/5.6 + blank. Estimating maybe a stop (?) purely by eyeball. Haven't had a chance to dive into that yet, but it's the opposite of what you'd anticipated. So, barring any camera/lens/meter problems, I'm not sure what I just proved on that point, except that my understanding of sensitometry is quite limited. The f/11 at 1/60 was an average reading from the Spotmatic meter. The f/5.6 frames are less dense than the exposed film leaders, so presumably I didn't accidentally overexpose and place these frames on the shoulder of the film curve. Any advice sorting that out would be appreciated. I'm going to have to find my old copy of The Negative.
@AZD
Here is a quick plan.
Using a fairly reliable shutter speed (you can use a phone based shutter timer to check times over a fifteenth second or so) take a series of pictures.
Based on the idea that a contrast of about 0.5 is a good development aim…
Take three shots of a blank unfocused flat shape (gray card). Two at a small f/stop like f/8 (these will be your thin negs), and then open up two stops and take another (this will be denser than the other two).
If the two thinner negatives on top of each other look about the same as the third shot, then you are getting close to 0.5 contrast, and that development time is good (or a bit longer since 0.62 is kind of the ASA test standard contrast).
@AZD
Here is a quick plan.
Using a fairly reliable shutter speed (you can use a phone based shutter timer to check times over a fifteenth second or so) take a series of pictures.
Based on the idea that a contrast of about 0.5 is a good development aim…
Take three shots of a blank unfocused flat shape (gray card). Two at a small f/stop like f/8 (these will be your thin negs), and then open up two stops and take another (this will be denser than the other two).
If the two thinner negatives on top of each other look about the same as the third shot, then you are getting close to 0.5 contrast, and that development time is good (or a bit longer since 0.62 is kind of the ASA test standard contrast).
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