Quote:
Originally Posted by Camelopardalis
Is it safe to assume that when the manufacturer specifies a given distance from, say, the outer piece of glass that the thread that the T-adapter screws onto fully meets that spacing requirement?
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Usually you don't measure from the glass but the end of the adapter:
http://rainerehlert.com/Takahashi/MetalBack-00.jpg
Also a tip from Ashley @ Precise Parts: "Incidentally for your information a male thread does not contribute to the effective length while a female thread is an integral part of the length."
Cheers,
Rick.