Answer to "Green lines across my images"Had a similar problem with a 5D MKIII, replaced the Sensor Ass'y, Main PCB & Mirror Drive PCB with test parts and didn't fix it, figured Main PCB was corrupted so downloaded and installed Magic Lantern (only on the memory card) ran the test's it comes with and fixed !!!
Answer to "Why doesn't my 24-70mm focus at 24mm?"Hi, chances are the flexible aperture ribbon has cracked and causing these issues, all Canon zoom lenses at some stage will have this part wear/break and require replacing, average lifespan of part EF-S lenses 2-5 years, EF lenses 5 years, EF L Series 5-10 years. See your local repairer the repair cost is economical on this lens.