4x5Australian
Well-known member
The centre filter (CF) E86/105 for the Rodenstock Digaron-W 32mm seems like a possible alternative to the rare Schneider CF IVd designed for the Super-Digitar 28XL lens.
The Rodenstock CF has the advantage of ready availability and uses dyed glass rather than the evaporated metal oxide coating used by Schneider that can produce ghosts in certain lighting conditions.
The native Schneider CF IVd provides 2 stop correction and has a 86x0.75mm mounting thread. The Rodenstock CF E86/105 provides 2.5 stops of correction and has an 86x1mm mounting thread. The lenses they are designed to cover both have an image circle of 90mm.
I'm aware that Schneider recommended that the older CF IVb for the Super-Angulon 72XL (95x1mm mounting thread) be used as an alternative, but perhaps the Rodenstock might work well too.
The big challenge, however, is that the 86x0.75 filter thread on the 28XL lens is located on the outside edge of the lens barrel, rather than on the usual position inside the front edge. Accordingly, the thread on the native CF is located forward of the rear surface rather than rearward. Schneider adopted this unique design, it seems, to bring the CF rearward as far as possible in order to avoid mechanical obstruction of the 28XL's image circle.
Has any forum member found an existing adapter to achieve this mounting? Alternatively, can anyone point me to the adapter ring needed to mount the Schneider 95x1mm CF IVb?
Rod
The Rodenstock CF has the advantage of ready availability and uses dyed glass rather than the evaporated metal oxide coating used by Schneider that can produce ghosts in certain lighting conditions.
The native Schneider CF IVd provides 2 stop correction and has a 86x0.75mm mounting thread. The Rodenstock CF E86/105 provides 2.5 stops of correction and has an 86x1mm mounting thread. The lenses they are designed to cover both have an image circle of 90mm.
I'm aware that Schneider recommended that the older CF IVb for the Super-Angulon 72XL (95x1mm mounting thread) be used as an alternative, but perhaps the Rodenstock might work well too.
The big challenge, however, is that the 86x0.75 filter thread on the 28XL lens is located on the outside edge of the lens barrel, rather than on the usual position inside the front edge. Accordingly, the thread on the native CF is located forward of the rear surface rather than rearward. Schneider adopted this unique design, it seems, to bring the CF rearward as far as possible in order to avoid mechanical obstruction of the 28XL's image circle.
Has any forum member found an existing adapter to achieve this mounting? Alternatively, can anyone point me to the adapter ring needed to mount the Schneider 95x1mm CF IVb?
Rod
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