EOS R5 with a Tamron lens: Is it worth it?

[sumshine15]

I have a Canon EOS R5 and I am looking at getting a Tameron Lens. I already have the lens adapter but I am wanting to know if it is worth it. I am looking at the following lease

Tamron 18-400mm f/3.5-6.3 Di II VC HLD APS-C Lens for Canon EF-S Mount 

Will it fit my EOS R5 and will it work properly, and is Tameron glass worth it, or am I better off buying Canon.

I am needing a longer lens, already have the canon 70-200 and 24-70 but need length for outdoor rodeo events 

[deebatman316]

No. Use a Full Frame lens on a Full Frame camera. Not APS-C lenses on Full Frame. You’ll have a great reduction in megapixels. Also the lens is designed for Canon’s EF-S Mount. Not the RF Mount so it won’t connect to the camera directly. You’ll be better off with a Full Frame Canon RF lens. Don’t bother with RF-S lenses either those are also designed for APS-C cameras which the R5 IS NOT. Look into the Canon RF 24-240mm USM lens.