TopSigma Telephoto 300-800mm f/5.6 APO EX DG HSM Lens for Canon Mount
It's time to clear out the storage before moving house and this thing has been sitting around doing nothing since I moved to Canon RF. It's a massive lens, quite heavy by RF standards but a good workhorse for the keen wildlife photographer. I found the sweet spot is at about 720mm. Comes with a soft case and 2.0 extender. Some nicks and wear and tear and thus priced accordingly.