M42 adapter for canon 350d
I've bought an m42 adaptor fo my canon 350d and have used a thin plastic ring behind it to prevent shorting the ef contacts. Has anyone any better method of preventing shorting without introducing debris into the space behind the lens. I am only interested in using my old pentax lenses manually and wish to compare them to the cheap but servicable canon lenses that came with the camera.
regards philip
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