LFingar stated that Wasabi batteries were highly recommended and when I viewed them on the computer they looked just like the SmallRig batteries which were also recommended.

Because I am only looking for a backup battery I deciede to give the Wasabi a try. After I got it, charged it and insurted it, it workd just like the Canon. I was also able to view the Menu/Battery Information. Here is a link to it
https://www.amazon.com/dp/B0CHT9F1YW?psc=1&ref=ppx_yo2ov_dt_b_product_details

So, Thank you LFingar for your tip.

Nope, I don't need no stinkin' mirrorless camera and I fer sure don't need no stinkin' full frame. I don't even shoot raw. But they kept it up, they kept showing me stuff till the rationalizer kicked in and my tiny rat brain went to work. What if I get a really good deal on a camera that I really, really want where I can get away with my present lenses for some time to come with no further expense and it will do everything my D7500 and my Z50 will do combined, plus have room for more tricks later if I want to learn them? The pressure was too much. Z7ii on the way. I don't even have the camera yet and I already spent $70 on a memory card (and that was on sale!) and as soon as I get the body to make sure all is well, another $50 or so for a card reader since my old one has no CFExpress type B slot. Might just need another dedicated monopod and maybe a ball head. So much for no further expenses... ah, but then I'll be a really, really great photographer, right? (Did I tell you about the 180-600 they keep showing me?) 😁

Why? They work on my crop sensor bodies and the ones I own by Canon do have a protuberance, tab whatever you want to call it that prevents mounting it on a full frame. On the other hand, the Sigma and Tamron crop sensor lenses just use the EF mounting ring and will mount on a FF body. Of course, they are made without the protruding lens element that can damage the mirror. I get anything from a circular image in the middle of the frame to vignetted corners. I have done it just for fun with an ultrawide angle to fairly long zoom lens from Tamron. When I put a 1.4x extender on it there was barely any vignette at all and with a 2x towards the long end of the zoom range no vignette at all.

Now that knowledge and $20 will get you a "Big Mac Bundle" at my local McDonald's

I have one or two of the old EF-s lenses around, I will have to dig and check in my camera storage cabinet. In the meantime -
From the Canon USA site - support Q&A:


"deebatman316
Authority deebatman316 (Where it says Authority, it means a Canon certified expert/authority.)
Authority
‎10-01-2023 11:45 AM

The EF-S Mount was released in 2003 alongside the first Digital Rebel series camera. From there the mount would be found on ALL APS-C DSLRs. ALL of Canon's APS-C DSLRs are FULLY COMPATIBLE with EF lenses. EF-S lenses ARE COMPLETELY INCOMPATIBLE with Full Frame & APS-H DSLRs and EOS AF SLRs. The EF-S Mount is MECHANICALLY INCOMPATIBLE but ELECTRICALLY COMPATIBLE with the original EF Mount. EF-S Mount lenses sit further into the camera than EF lens would. The mirror would hit the rear lens element and cause serious damage on a Full Frame DSLR. ALL EOS Film SLRs Full Frame DSLRs ARE INCOMPATIBLE with EF-S lenses and won't mount. So even though EF-S came later on you can't accidentally mount the lens. The lens was designed NOT to be mounted to those cameras. Canon's APS-C DSLRs have 2 mounting indexes one at the 12 o'clock position and one at the 1 o'clock. EF lenses use the one at the 12 o'clock position and is a red circle. EF-S lenses use one on at the 1 o'clock position and is a white square."


I see Canon uses the term "indexes" I am used to seeing and using the term "tab". I will have to try and remember to use Canon's term in the future.

RF and RF-s bodies have the exact same mount, and all RF lenses will mount on both type bodies. EF and EF-s bodies have different mounts, an EF lens will fit and work on an EF-s body but an EF-s lens will NOT mount on an EF body. There is an extra little tab on Canon EF-s lenses that prevents them mounting on an EF body at all. Try to force it, and you will have a big $$$ repair bill.

And yes, most third party lenses for Canon use the EF mount even if it is a crop sensor lens.

I have 4 EF-s bodies (one is my wife's) and 2 EF. 1 RF body and 1 RF-s body. and two dozen lenses between the two types.