Your dating yourself Dean2 lol
Been shooting Canon last 15 years. There are 3 Canon lens mounts in this time. EF-s being the oldest and not compatible with the Ef and Rf. Those were mainly pro consumer entry level cameras ie rebel etc.
Ef is compatible with the newest Rf lenses with an adapter. RF is for nitriles cameras. Ef has the biggest range of available lenses and best price points especially for wild life lenses from 300 to 800mm.(used market). RF is the newest generation and new format and doesn’t have allot of available lenses and what they do have is expensive. I just changed over to this format. I like the upgrade especially the body and excellent focus and tracking systems, crazy good. Be careful wildlife photography is not a cheap hobby lol. What I will tell you is bodies come and go l, so would rarely buy new. but glass is forever! Prime lenses for wildlife is the way to go. 300mm f2.8. Can ad 1.4 adapter without loosing any degradation. 500mm f4 is the standard for wildlife. It’s big and weighs a bit. Tripod helps immensely. Great price points in used market. It were still talking thousands of dollars
Biggest question is how much you’re willing to spend? As your cheapest option ie under a grand is a camera that has an optical zoom built in. Maybe happy with that but the end results don’t compare but maybe very happy with end result
Even the old EF that I’m suggesting still takes stellar picture in the right hands. Examples below.
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