2" Extension Tube (ET080)

This gave me exactly the extra 80mm I needed to reach focus with my new field flattener. The 35mm deep receptacle held my coma corrector securely.

Finally, an extension tube that actually threads smoothly onto my focuser without any play. The 35mm deep receptacle held my coma corrector securely, and the extra 80mm of back focus made my field flattener reach focus perfectly.

I needed more back focus to reach proper spacing with my camera setup, and this 80mm extension tube did the trick perfectly. The 2" receptacle is threaded smoothly and holds everything tight without any slop.