The lens is certainly cheaper than the Kirk replacement collar, but the lens doesn't rotate as smoothly as my 80-400 Kirk replacement collar. You can't see anything, but it looks like Haoge's collar is metal on metal, not nylon on the metal of Kirk's collar. I've also found that I have to completely unscrew the Haoge collar to take it off or on, whereas with the Kirk collar on my 80-400 I just have to unscrew the collar and align the lugs and grooves.
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