Why is SMC much more expensive than

Competing brands like INON, Weefine, and subsee, Aquatica? 

Im OK with paying when it's worth it. 

I have a canon 5dmk ii and Canon 100mm L lens. 

I need a diopter because I'm routinely reaching or going beyond the minimum focusing distance. 

Is the AMC-1 worth it's price compared to others? 

Thank you. 

Hi Hedonist,

I have both CMC-1 (for Oly EM1II and Zuiko 60mm and Pana 45mm macro lenses) and SMC-1 (for Sony A7R5 and Sony 90mm macro lens):

CMC-1 weights 260g and costs 415 Euro (= 1,6 Euro/g)

SMC-1 weights 460g and costs 556 Euro (= 1,2 Euro/g)

=> actually you get the glass cheaper with SMC-1, compared to CMC-1...

CMC-1 is for cropped sensor (compact, MFT, APS-C) and SMC-1 is for FF sensor. According to Nauticam port charts (https://www.nauticam.com/pages/n120-canon-ef-mount-port-chart) you need SMC-1 for the Canon 100mm IS lens...

I cannot say anything about the other brands, but I prefer to have the very best (I hope Nauticam delivers this) instead of buying twice (or even more often)...

Wolfgang