If you were to look at the product description on the TTArtisan's website, it says that the front inner barrel of the TTArtisan 40mm f/2.8 macro lens can be disassembled. I looked and searched online for their official instruction but couldn't find any. So feeling unsatisfied, I decided to seek an official TTArtisan answer by sending an e-mailed to them for clarification.
Less than 12 hours later, I got a reply from their "After-sales Customer Service" and this is what they say:
