If you intend to use your EF-S lenses, you will need one of the adapters. This will essentially negate any weight decrease from your 90D. To benefit from the lower weight of the R7 vs the 90D, you would need to replace EF lenses with RF equivalents to eliminate the adapter weight. Also note, while there are a number of RF lenses (which don't need an adapter), there are only 2 RF-S (designed for crop cameras) lenses currently available. Then again, the RF-S 18-150 is a handy "all-in-one" lens and with the R7 (+ battery & memory card) weighs just under 2 pounds or 1000 grams.

Ditto for 50 years.

Here is my experience. I wanted best clarity, so I opted for single focus (distance) lenses. I accepted that I would need glasses for reading. After the surgery, it was apparent the lenses were not really long distance, but since I would need glasses for reading if they were, and since correcting was much more difficult than the original installation, I kept them and opted for progressive lens glasses.

I was amazed how clear the world became, and that colors were brighter. (The natural lenses had turned yellow).

As it worked out, after a few years my eyes changed so that if the original lenses had been truly for distance, they would no longer be giving me clear distance vision. Since I was wearing glasses anyway, it didn't matter.

Canon has yet to license any lens manufacturer to use the R mount electronics. No other manufacturer should have an adapter that allows an automatic lens to work properly.

Drop Box is another alternative

Many possibilities. Bad contact between lens/adapter/body. Auto/manual focus switch (on body or lens) in wrong position. Focus setting in body menu set wrong - to name a few.

This is what I was going to suggest, use mode Tv. Set it to a faster speed than what the camera decided when it was too slow. 1/125 or even better, 1/250 should work.

The P and Av modes will set the shutter speed (Tv) it needs to get enough light with the aperture and ISO set as you selected. I doesn't care if that is too slow. The darker the subject, the worse the slow speed.

I have 2 compacts and 1 bridge camera. I got the ZS100 before the 200 came out. I wanted a pocketable camera with better than a 1/2.3" sensor, a viewfinder, and a zoom lens with as much "reach" as available. I was happy with it except that on occasion, I wanted more reach, so I got the ZS80. The bridge camera came much earlier and has more reach than anything else I own. It got a great eclipse shot. It is an SX50 HS.

Yes, the G5 is one of the few, but in my case I wanted more of a "reach" at the long end.

My only objection to most Canon compacts is the lack of viewfinder, even though I'm beginning to use rear displays more often.

I was on my front porch in Goodlettsville TN. I had my SX50 HS bridge camera (yes, 1/2.3" sensor) on a tripod. I consider myself lucky. The second shot is how the spaces between the tree leaves made many eclipse images on my porch bench. The first is a crop of the SOOC photo, lens at full tele.

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Do not save anything on that card. Put it back in the camera. Connect a USB cable to the computer and camera. Use the computer operating system's file browser (File Explorer, My computer, or whatever) to view the contents of the camera. Navigate around and try to find those photos.

I am not aware of an FZ80 II, but the FZ80 does NOT have a 1" sensor. It is a 1/2.3" sensor.