I do a fair bit of stacking using an MP-E65 lens and the Cognisys stackshot, however one problem I get is trying to align the lens with the Stackshot which is very important when stacking. See this article here by Peter Lin which explains the problem in more depth - https://pylin.com ...-axis-for-focus-stacking/
The problem is that the lens (via its ring) just attaches to a flat plate on the Stackshot so, I have designed an adaptor to fix this problem which ensures the lens is attached perfectly square everytime. This adaptor is 3D printable and I have made it available for download here if you want to use it yourself. Happy stacking Oh, if you haven't got a 3D printer I can print and post these out at a cost of £5 plus postage, just PM me.