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Out of an abundance of caution with this type of more involved maintenance on parts I'm not sure will come off or go back on easily... I opted to first try to re-produce the left-edge smear effect with our current setup, so I could confirm again what I was seeing during 2001, and have a way to verify any changes actually improved things.
Swapped over to 70mm today and spent the better part of a day with what little 70mm footage we have available to test with. Unfortunately I was not able to get a clear example of the shutter smear on screen. I even tried a black leader loop with the frame line centered in the gate. No edge shutter ghost (at least not jumping out at me). Then i tried a couple different lamp focus positions to see if I could force the bleed around to be worse and expose it. Nothing there either. Fought with some Red October 70mm snips I had scored on ebay, only to learn after making a baby reel, they are too shrunken to trust in the projector (nearly 1 perf over 100, and lots of holdback sprocket skipping).
The day's takeaway however is the shutter is definitely wrong/35mm, with the shutter shroud off in 70mm mode, you can visually see how much light is landing beyond the right edge of the shutter. Perhaps exacerbated by the fact we are till using the strong 70mm beam spreaders and thus have ovular light beams. I should have snagged some pictures.
I may try again when I have a helper who can go watch in the house, hard to see anything subtle with light blasting all over the booth due to having the guard and snood off during investigations.
We also might just try the shutter migration, but I hate risking creating new problems when I am struggling to even find the existing problem. ;-)
Swapped over to 70mm today and spent the better part of a day with what little 70mm footage we have available to test with. Unfortunately I was not able to get a clear example of the shutter smear on screen. I even tried a black leader loop with the frame line centered in the gate. No edge shutter ghost (at least not jumping out at me). Then i tried a couple different lamp focus positions to see if I could force the bleed around to be worse and expose it. Nothing there either. Fought with some Red October 70mm snips I had scored on ebay, only to learn after making a baby reel, they are too shrunken to trust in the projector (nearly 1 perf over 100, and lots of holdback sprocket skipping).
The day's takeaway however is the shutter is definitely wrong/35mm, with the shutter shroud off in 70mm mode, you can visually see how much light is landing beyond the right edge of the shutter. Perhaps exacerbated by the fact we are till using the strong 70mm beam spreaders and thus have ovular light beams. I should have snagged some pictures.
I may try again when I have a helper who can go watch in the house, hard to see anything subtle with light blasting all over the booth due to having the guard and snood off during investigations.
We also might just try the shutter migration, but I hate risking creating new problems when I am struggling to even find the existing problem. ;-)
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