1.75" Twist Lock Extension Tube for 2"

I purchased a 13 & 8mm TV Ethos, both are 2” or 1.25”. When I first tried them in 2” the 13mm was great but the 8” wouldn’t focus, not enough back focus on my Celestron 8” dob. The 8mm worked fine in 1.25” mode but the 13mm wouldn’t focus in 1.25” mode. So I picked up this extender and simply leave it on the 8mm. Works like a charm, twist to tighten works great, it’s as if it’s just 1 long eye piece.