My question concerns Adapters vs Extension Tubes:
If an extension tube is used to aloud a lenses to focus closer for macro photography, does an adapter have the same effect on the lenses. Example #1: If I were to buy a Sony Full Frame Camera (A7RIII) and use all my Canon EF lenses instead of buying all new Sony lenses, what effect would that have on light entering the camera? F stops, SS, and ISO. Example #2: If I bought a Canon R6 or R5 and used an adapter for my EF lenses, what effect would that have on the light entering the camera? F stops, SS and ISO.

I hope I explained my question so its understandable, if not I am sorry.

Thanks in advance for your replies.

Joe W.

I'm new to Mac, but this is what it looks like to me:

Time Machine defaults to saving your local stuff.

I don't see a way to add additional stuff to the backup. System Preferences => Time Machine has an Options button which allows you to exclude things from the backup but I don't see a way to add things.

Of course if you have things on an external drive and can attach a second external drive you can just copy files from one to the other.

We need someone familiar with Time Machine to chime in and let us know if it's possible to add things to the Time Machine backup.

Any Mac guys out there?