Q. I just need an extension tube. How do I specify that?
A. First select the device or feature the extension tube will connect to, on either the Telescope or the Camera side, then select extensions and spacers -> Extension Tube on the other side.
The "extensions and spacers" category is located at the end of the pull-down menus on the first page.
Note that we define "extension tube" as a connector with opposite genders at each end. For example a threaded extension tube has a male thread at one end and the matching female thread at the other end.
Most, but not all, kinds of extension can be designed online.

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