Originally posted by Bethor Hey all, I recently noticed something on all my pictures taken with my 18-135mm that has me stumped.
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*This does not appear on any other lens that I use.
Thank you in advanced.
You've already stated the most important fact: it appears with one lens, not with others. Therefore, the defect is in that lens, as the title of your thread states.
Take the lens off the camera (subsitite a lens or use the cover that came with the camera to keep other dust out, of course) and use a good magnifying glass (like, 8x or 10x) and carefully examine both the front objective lens as well as the rear. I use a hobby magnifier to do cleaning, one of those head-band things with built-in LED illumination and multiple lenses so I can not only see well with both eyes, but use both hands while I'm looking.
In my experience, crud on the sensor makes a glob on the images that won't go away, doesn't move, and doesn't change according to variations of the lens settings.
Bits on the lens or filter will expand or contract depending on focus, and will go from visible to invisible depending on the use of the zoom function.