more quattro 150

 Almost there. Sill one not too good corner but hey...

Spacing with the Quattro 0.86 cc:

17.5 + 21 + 17 = 55.5mm too far
veTEC backfocus + svbony filter drawer with moon filter + m48 tube

Removed both mirror clips and flexi-rubber focuser inserts. Added a  proper dovetail and rigid box section aluminium rail along the top of the tube rings. Plus, guest appearance of 3M double sided adhesive silicone circles; much easier than silicone sealant.

Giving (frames as ~ m51)

m51 whilpool in ursa major
veTEC571 on Q150p    36x4min @ hcg100

m101 pinwheel in ursa major

m39 in cygnus

m11 wild duck in scutum