Ha, you had to say that didn't you. My other solution was somewhere along the lines of one of these: www.allproducts.com/.../product1.html (Which I can't find anywhere near here, all similar products in the hardware shop are bare-metal and/or wrong shape. I still want one for my massive 2kg Jupiter 250mm f/3.5 Pentacon Six, i'm afraid it will rip my lens mount apart one day).


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And thanks Jan, that pretty much exactly what I was hoping for, no need to go nuts on the accuracy (if the canon is a bit smaller than the samyang that's good, because the main complaint about ebay knock-offs are that they're too loose). And that's a popular enough product, ebay-ripoffs are down to $7 shipped so cheap enough for experimenting. (cheap rings for the 70-300L are up at $50, it's too new a product and no competition yet, I can wait on that)


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As for the L-brackets, thanks for the Kirk/RRS suggestions too. I still plan to investigate them when I buy into a tripod system (early next year I hope, if not this year), one day i'll want to mount vertically for portraits and such, with the niftyfifty or my mum's old Takumar (or the 85/1.8 or 100/2 i'll ask her to get when she's in Hong Kong next).


Have either of you used the L-brackets you suggested, how much clearance is there around the N3 socket? The more clearance the better, my main concern is too much wear-and-tear on the rubber cover, the last thing I want is to rip it at the hingey bit and lose my watersealing. And the non-gripped Kirk is only $140, but then it says "and an (optional) camera plate is necessary", bit confused about that.


I've had a bit more reading about the Manfrotto 340/341 L-mounts, damn they make it confusing as to what plate plugs into what clamps and what doesn't. That's definitely something I'd want to see before I buy, so i'll have to sweet-talk my local camera-shop into ordering it into stock without me having to pay for it, if i can...