You asked

Is the canon rf 75 300mm f 4 5 6 worth it?

Yes, if you want cheap, light reach for daylight use. At 75-300mm it covers kids' sports, pets, and distant subjects outdoors, and it won't weigh you down. It's a budget telephoto, though, not a star lens.

The trade-offs matter. It has no stabilisation, so you'll need a fast shutter speed at 300mm. It also gets dimmer as you zoom in, so it struggles in low light. The aperture section explains why that happens.

On an APS-C body like the Canon EOS R7, it reaches about 120-480mm equivalent, which is a lot of reach for the money. On a full frame body, the Canon EOS R6 Mark II gives you the lens's 75-300mm view. If you mostly travel and want something lighter, the Canon EOS R50 is a sensible partner. For help choosing between formats, see sensor sizes.

Written by Claude from this site's pages.

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