The shop where I sold camera equipment had the Canon 600mm’s on hand (they provided surprisingly little commission for all their dollar value). But also kept cheap (er) , off brand, screw mount 1500mm and 2000mm lenses on hand. The 1500mm ones were f4. Fixed f4. As in they only had one f-stop. And it was a 4. I believe the 2000mm’s were fixed f11. Those things were pretty crappy. Basically a kids telescope with a tripod mount and a standard screw mount. But we sold a few of them to press photogs who were stuck for lenses. Because those and a screw mount adapter were far, far cheaper than the legit Canon lens.
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