I have a late-model Phillips Explorer 8x10 that takes Technika-style lensboards. I used to use a 300mm APO Symmar-L lens with it with no problems.
I tried mounting a 300mm Sironar-S for the first time last night and found that while the lens rear element fits through the circular hole in Explorer, if I try and angle the lens in order to slot the bottom edge of the lens board in, the top of the rear element doesn't clear.
This wasn't an issue with the APO Symmar-L since the rear-element on that lens didn't immediately flare out. There was some clearance so I was able to insert the rear-element through the opening and then angle the lens.
It looks like if I were able to get a Copal 3 lens board that was drilled just 2mm lower, I'd be able to make the 300mm Sironar-S work, but I'm not sure.
Has anyone run across this issue with the 300mm Sironar-S?
Does anyone know where I can get a Copal 3 lens board custom drilled?
Is there something else I'm doing wrong?
Picture of lens without lens boards is the APO Symmar-L. Picture of lens with lens board is the Sironar-S. Notice the difference in rear element shape.
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