Interesting Developing Result
Interesting Developing Result
I have not been doing this for as long as some of our esteemed contributors on this forum so I am sure I have not seen everything. But I was somewhat surprised when I pulled a roll of film from the soup the other day.
To set the stage, I had done some more bracketing using the JCH Street Pan 400 film at normal box speed in a couple of different cameras. I had decided to use some D76 Stock this time instead of diluting it, further I had decided to run both films in my Jobo 2521 tank. Because I was using the Jobo I decided to do continuous agitation on the rollers since I hadn't tried this with the Street Pan 400 before.
So, I have two rolls of Street Pan 400, shot at box speed, in the Jobo tank with 300 mliters of straight stock D76, no dilution. The solution is 20C and since the normal recommendation on the box the film came in was to develop for 12 minutes and 30 seconds, I deducted 15% from that for the continuous agitation and came up with a development time of 10minutes and 38 seconds. I rounded that up to 10 minutes and 40 seconds and developed the film.
The first roll I pulled out of the tank was shot with the Pentax SV, which I hadn't exercised in a while. These next three photos are from that roll. The first was a normal exposure as recommended by my Weston Master IV meter. The second was given one stop plus exposure and the 3rd was given one stop minus exposure.

- Normal

- Plus One Stop

- Minus 1 Stop
Holy smokes Batman! What has happened here? All three of these exposures look overexposed. Could the shutter be that far out of whack on the SV? I haven't used it in a few months but this is crazy. Every photo looked like this. I wasn't sure what to think.
Fortunately, I had a second roll that had been developed exactly the same way. The camera used was the Zeiss Ikon with the ZM Sonnar 50/1.5. Fortunately I had exposed some of the same photos with the ZI as I had the SV. But I hadn't photographed the large format camera. There were several similar ones to choose from but the example I choose to display here is a photo of my old wheelbarrow using the camera meter's recommended exposure. The second is the SV using the Weston Master IV's recommended exposure.

- Normal exposure with ZI

- Normal exposure with SV
The photo metered using the Weston handheld meter looks a little closer to correct but both photos look vastly overexposed. But at least I was starting to settle down a bit. Maybe the Pentax SV shutter was working correctly after all and something had happened in development. Maybe these photos were overdeveloped, not overexposed?
So, I went out with the MA and, using the Weston, exposed the LF camera again. (It was in my garage and the light had not changed as it had in my front yard.)
I proceeded to develop this roll of film in D76 stock at 20C using my smaller Jobo 1510 tank. I agitated continuously for the first 30 seconds and the twice every 60 seconds after that. When I pulled the roll out of the tank everything looked normal.

- Normal exposure using Leica MA and Weston Master IV meter.
Now, I have never had this happen before. I have used continuous agitation with my Jobo tanks for several years with numerous different developers and have never seen this before.
I just finished developing two rolls of Street Pan 400 using my Jobo 2521 tank on the rollers with D76 diluted 1:1. I haven't scanned anything yet but the negatives look pretty normal.
Does anyone have any idea what may have happened?
EDIT - Ooops. If I had thought about that one for a few moments I could have answered it myself. I can be such a dunce sometimes. I would blame it on age but I have been this way all my life.