I recently purchased a used Mamiya 7II 150mm lens from a very well know used photography equipment broker in the southeast. Upon receipt of the lens I noticed a very odd and audible sound when the lens was focused in and out. It almost sounded like a spring being trapped and a little bit of scraping each time the focusing ring was turned. I checked my other two lenses for the Mamiya,...quiet and smooth. The lens was sent back to the broker with a description of the problem. Today I found out that the repair department at their store compared it to another 150mm lens they have in stock and according to them it makes a similar noise. From this they concluded that this sound may be 'normal' for this focal length lens for the Mamiya 7II. The good news, they fully refunded my money. I would appreciate if anyone with a 150mm lens and or any info. or insight into this situation could write back. Thanks in advance for your help.