I post this on another 50mm 1.8 thread on here but I'll put it here also . I wanted the lens hood to be able to turn around backwards to keep it out of the way when not in use .Any squeeze grip hood that fits the 52mm threads will work just so happen to have a
sigma 52 mm thread size so I use it . On the squeeze grips there is a top side and a bottom side .On the top side you can see threads that grip onto the lens threads and on the opposite side of the grip there is no thread groves so you have to use a small round burr to cut a undercut in it so it will grab onto the lens cap slots your going to cut next . place the lens hood upside down on the lens cap and mark the area of where the grips are with a pencil and use the round burr to cut a opening in the cap on both sides so the grips can fit into the opening . Cut a small undercut in the slot also so it will lock into place. It only takes a few minutes to do . This will fit on any 52mm lens threads . Here are a few photos of what I did.
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Last edited by pentaxk3user; 02-15-2021 at 11:55 AM.