This is one of those Hasselblad F lenses, with no built-in shutter and the focusing ring placed at the front. I bought it from Ebay years ago to use it on an APS-C DSLR with an adapter. Optically, the lens is nothing short of amazing, it's a Carl Zeiss, T* coated, with beautiful contrast and colors. I really love it and I would not be able to buy it today for the price I paid for it back then. However, one thing that the Ebay seller didn't mention is that this lens has a pretty stiff focus ring. There are no weird sounds, no grinding, no uneven travel, it's just that you need to apply some force on the ring in order to move it. This hasn't stopped me from using this lens successfully so far. But it does bother me a bit, especially because I'm afraid it might get worse with time or maybe even damage the lens. Repair shops I inquired about this did not reply for the most part. The only one that was willing to do it gave me a quote of $300 to $350 for the job, which pretty much sealed it for me. This might be a fair quote for a focus CLA on a Hasselblad lens but I am not willing to pay this kind of money for it. Also, all these shops are abroad (there is no one in my country that I know of), so I would have to pay for shipping as well. Given these circumstances, my intention is to leave the lens as it is and deal with the stiff focus. I know it's not wise to try and mess around with a crazy complex mechanism that require special tools to get into. The reason I wrote this post is to find out from the more knowledgeable people on this forum if this is by any chance a trivial job to do. Something that happens to be a simple fix that doesn't involve dismantling the entire lens. If there is any chance at that, I might give it a try.