Hi I just wanted to start a new post for everyone to talk about tips, tricks and any problems that you might be encountering. Looking forward to this topic!
Please do not be shy. This will help all of us!

I’m having focusing issues with my Canon 28-135 IS lens. Starting a few weeks back, every few frames seemed to be just a tad soft. At first I thought the issue was “user error” because I kept forgetting to shut off the IS when using a tripod (which I use most of the time). However, even with IS turned off, the focus remained softer than I find acceptable. Because this was not a constant issue, I kept blaming the problem on my mistakes or just pushing the reach of the lens, etc. Then, last night I was shooting just after sunset in a high contrast situation. [A lighthouse lit up with Xmas lights against a near black sky and breaking waves in the foreground] and switched to manual mode because the lens seemed not to be focusing correctly. Mid-way through, I suddenly could not move the focusing ring at all. Yet, when I switched back to auto-focus, the lens did focus, sort-of. I am disappointed with the results of this shoot. Out of nearly 20 frames (with this lens), there are only three or four that have acceptable sharpness and these are still not quite what I hoped to achieve. The frames shot with another lens are sharp throughout. I still cannot get the focusing ring to move manually, but the lens will focus in auto mode, although not as sharp as it should. So…is this lens toast or can this stopped focus ring be fixed? Any input will be greatly appreciated!