Can anyone tell me how to remove the lens hood on a 240mm Kowa Graphic lens in barrel. Someone sent me this lens to compare coverage with my 240mm Computar but the lens hood vignettes the image, making the comparison impossible, and I can not figure how to get it off. Since the lens belongs to someone else I am nervous about applying to much pressure but I did turn the hood fairly hard thinking it would unscrew from the mount but nothing happened.
Thanks in advance for any advice on how to remove the hood without damaging the lens.
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