kunlun121
21-Aug-2021, 02:29
Hi everyone,
I'm trying to figure out if it is possible to use this lens DB mounted for use with the Sinar auto aperture shutter. After some google research I found one old listing somewhere of a Fujinon A 240mm f/9 DB mounted, but usually these lenses are offered with a Copal #0 shutter.
It's one of these I'm thinking of buying, but would like to use it with a Sinar auto aperture shutter. I am told by someone with lots of large format tech / mechanical expertise that the lens fits on a Sinar DB board with mounting threads and spacing for a copal #0 shutter. These can be found with little effort. The question is whether the Sinar shutter will be fully functional with this lens in the DB board. Apparently there is a risk of a mismatch between the aperture settings of the DB mount and the lens. Does anyone have any experience with this? It seems this conversion is mostly done the other way round, i.e. from DB mount to a Copal #0 shutter.
A search of this forum yielded an old (2013) thread with some information that looked promising. Unfortunately the relevant information was in a link that is now long dead... (A file linked to here (https://www.largeformatphotography.info/forum/showthread.php?100236-Sinar-DB-boards&p=991921&viewfull=1#post991921) (post #4) posted by erie patsellis on this forum.)
I'm trying to figure out if it is possible to use this lens DB mounted for use with the Sinar auto aperture shutter. After some google research I found one old listing somewhere of a Fujinon A 240mm f/9 DB mounted, but usually these lenses are offered with a Copal #0 shutter.
It's one of these I'm thinking of buying, but would like to use it with a Sinar auto aperture shutter. I am told by someone with lots of large format tech / mechanical expertise that the lens fits on a Sinar DB board with mounting threads and spacing for a copal #0 shutter. These can be found with little effort. The question is whether the Sinar shutter will be fully functional with this lens in the DB board. Apparently there is a risk of a mismatch between the aperture settings of the DB mount and the lens. Does anyone have any experience with this? It seems this conversion is mostly done the other way round, i.e. from DB mount to a Copal #0 shutter.
A search of this forum yielded an old (2013) thread with some information that looked promising. Unfortunately the relevant information was in a link that is now long dead... (A file linked to here (https://www.largeformatphotography.info/forum/showthread.php?100236-Sinar-DB-boards&p=991921&viewfull=1#post991921) (post #4) posted by erie patsellis on this forum.)