I’ll be honest, I think the 65mm on the ATX/STX suffers the most in the line up. I believe it is on par or even a bit worse than the sts/ats HD with the wide zoom. If only after weight and a 65mm in mind, I’d go ats/sts HD with wide zoom eyepiece. I upgraded to the 85mm where I think the STX/ATX shines. And I run a BTX, so it made sense.