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My concern is these replacement collars are going to have a short foot like the Nikon one. I do like the 5.25 plate from Kirk for both its function as longer handle, and the reach to the lens controls.Seems like he's pretty positive about it. His complaints are the ones we all have, lens foot/collar are bad (which they are). He doesn't like the weight, and thinks it doesn't balance as well (I feel like mine does, but I have a 5.25" plate from kirk on it, so I think this is a more personal thing). He does say his copy is sharp wide open (which I agree there, mine is solid), and works well with a TC.