I used to manage a retail electronics store for the largest electronics chain in the US, but which is now in bankruptcy.
I saw a lot of customers who just didn't get it during those years, but there is one particular brand of customer who stood out from the rest. This type of customer was so very sure that they were right and knew more than I did, so trying to help them was like spitting into the wind. These customers wanted an 8mm to VHS cartridge converter. The following account is a generalization of the many customers I saw that fit this particular mold... C = Customer, M = Me.
C: Hi, I need to pick up an adapter cartridge to convert 8mm camcorder tapes to play in a VCR.
M: I'm sorry, sir, there is no such thing. Perhaps you are thinking of a VHS-C to VHS converter. The only way to make that connection is with cables from the camcorder to the VCR.
C: No, my sister has one. If you don't carry them, just say so.
M: No one carries them sir, the signals from the tapes are incompatible. See, here is a VHS-C tape. It looks like 8mm, but it is not. This is what your sister has.
C: No, it's not! I know what I know and you just don't know how to do your job. I'll go find one at another store!
M: If you do find one, please come back and show it to me. I would love for you to prove me wrong.
They never came back, because they never found it.
For anyone who is curious as to why an 8mm tape to VHS cartridge does not exist, search the web. The answers you seek are out there.