365Astronomy Adjustable Camera Adapter from 2" to T2 - Variable Length
EXTRA WIDE VERSION - Camera Adapter from 2" to T-2 with Variable Optical Lenght & 2" (M48x0.75) Inner Filter Thread for Your Specialised Deepsky, Colour or other Filters
When used with a dSLR, a camera specific T-ring would be necessary...
Overall optical length when extended: up to about 100mm (no fixed value as the diameter of the internal part is exactly 2", so it can get inside of a 2" eyepiece holder as far as the eyepiece holder will allow...)
Overall optical length when unextended: 60mm
Image is for demonstration only. Lucy (the cat) is not included!