Re: [APML] determining thread sizes?

[astropix@att.net (Geoff Powers)]

 Hey Dan...

 

     Most camera/astro accessory threads are standardized, and given common names such as 'T-thread' or '2" eyepiece' thread etc. Most of these are metric.

 

      Generically speaking, the size dimension of a screw is based on the OD of the *male* thread componet, both standard and metric. The thread count, or 'pitch' is the number of threads per unit of measure... threads per inch, standard... threads per milimeter, metric.

 

      A thread pitch gauge, which looks like a collection of miniature saw blades, is used to accurately determine the pitch of a screw thread... these gauges work on all male threads, and any female thread large enough in diameter for the gauge to enter.

 

 Hope This Helps...   : - )

--
Geoff

http://spacelysprokets.com
--
http://segertribute.com

-------------- Original message from "kaestner" <kaestner@surewest.net>: --------------

Hi,

Can someone please tell me how to determine thread sizes for the various lens & adaptors out there?

How are they actually measured, I’m assuming with like calipers, in millimeters?

Thanks

Dan K.

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