Q. I just need an extension tube. How do I specify that?
A. First select the device or feature the extension tube should connect to, on the Telescope side or on the Camera side, observing the direction of light, 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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