Sorry for leaving you hanging. After what seemed like a dozen test images and changes in spacing I sent the Apex back. After I did that Starizona added a spacer to the web page that is required to use the Apex with the 120 and 150. I was told that they failed to actually test the Apex on those two scopes.
They have a weasel worded explanation to the effect that some buyers could not reach focus, The correct wording I'm told is that no buyer with a 120 or 150 could use the adapter and reach focus.
Starizona supplied the extension to early buyers at no cost if they complained. Too late for me.
Based on what I did see and some user reports the Apex should work well. provided flats are made. I saw a lot of vignetting, and I may have had a dud example. Others report much better results.
I asked if Starizona would supply non post processed images made with a 120 but have yet to get a response.