rwags18 wrote:
I’ve recently came across an article in which it states that two Canon extenders, the 1.4x III and the 2.0x III, can be stacked, with the use of a 12mm extension tube, and not lose the auto-focus feature. It states that if you use a piece of insulated tape and place it over the contacts of the 2.0x extender, that will eliminate the loss of auto-focus with the 2.0x extender. Has anyone ever done this? What is your opinion of how this would affect the picture, if any?
IQ goes down among other things.
Years ago a photographer for one of the now gone magazines got weird and put multiple extenders and extension tubes together with a lens so the result looked to be 3-4 feet long and the focal length went over 2000 mm. It took two tripods, one for the body and one for the lens to prevent bending and breaking. Then he took shots of a small hawk at some ridiculous distance. The results were barely OK, but if for say bird ID and not framing a picture it was just fine. And of course, no auto focus.