While researching tripods and heads I ran across this comparison and review on 10 different heads including the sirui k40 and RRS. Thought I would share.
https://m.dpreview.com/reviews/battle-of-the-titans-top-ball-heads-tested/12
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https://m.dpreview.com/reviews/battle-of-the-titans-top-ball-heads-tested/12
Sent from my iPhone using Tapatalk