-What is the weight difference between LMB-5 and MMB-1 (both in their lightest modes with the MMB-1 having the LWS removed)
-Can the MMB-1 Take 138mm Round Filters?
-If so, does that require the 143mm Back?
-Does the stock back support a 138mm Bellows?
-Are the 4.5" Bellows compatible between the MB20 and MMB-1?
-Does this Adapter Ring allow R4/5 reduction rings?
-Is this for clamp rings?
-What size ring or bellows is required for Zacuto Universal Donut?