Extension tubes for ESATTO 3"

Installing these tubes was straightforward, and the threads are cut so smoothly that everything seated perfectly on the first try. The length options covered the back focus gap I was worried about, no wobble at all.

The solid aluminum construction gives these extension tubes a reassuringly precise feel when threading onto my focuser. I was worried about extra weight, but they're actually lighter than I expected for the thickness. My imaging train now sits at the perfect distance without any flexure.

Finally, my focuser has enough back focus to reach focus with this setup. The threading is very smooth and mates perfectly with the ESATTO 3".