Hello All... Just bought my first 4x5 lens, a Schneider 135mm f3.5, and I'm wondering if anyone can tell me what the rear lens cap size of this lens is? Also, I find that the lever to open the lens for focusing is quite hard to push down in order to open the lens. The aperture and shutter rings are also showing a medium level of resistance. Is it possible to correct these problems at home, and if so, how? Any help would be greatly appreciated. Thanks
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