There are a lot of pitfalls that can cause blurry landscape photos, some obvious and some a bit more subtle. This excellent video tutorial discusses some easily missed causes of blurry landscape photos and what you can do to fix them or avoid them in the first place.
Coming to you from Mark Denney, this awesome video tutorial discusses some subtle errors that can rob your landscape images of sharpness. One that I overlooked for a long time was the hanging camera strap on the tripod. If you have an easily detachable camera strap, then all you have to do is remember to unfasten it once your camera is on the tripod. If you do not have one that is easily removed, a quick trick is to simply wrap your strap around the body or lens so it can't sway in the wind. I do this in particularly windy conditions or when I am in moving water, and it has made a noticeable difference in my keeper rate. Check out the video above for the full rundown from Denney.
And if you really want to dive into landscape photography, check out "Photographing The World 1: Landscape Photography and Post-Processing with Elia Locardi."
For 18 yrs I was in the commercial photo business. When I retired I concentrated on landscape and wildlife. And, even though I have many years of experience and have some of Canon's top of the line equipment, I still believe there are things to learn and images that can be improved. Your videos have been my go to when I need assistance. I have used many of your suggestions to perfect my images, both in the field and in photoshop. A big THANK YOU.
Dennis aka Imagecreations
The 1/ focal length is one of the very first things I was taught when using telephoto lenses. A very good suggestion. I am going to try the timer to settle the camera suggestion on a lens test. There is one more you can add to the list is lock the mirror up so you don't have a shutter slap during the actuation.