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I've only had the Rebel T7 for about a month. I've got a 18-55mm lens. When I am on AF and zoom in on anything and slightly hold down the shoot button to focus it will, sometimes, go ahead and focus, but even when it does once it actually takes the p...

Just got new Rebel T7. The autofocus works with the included 18-55mm lens but when I add on any additional lenses (it came with several including a commander optics HD Telephoto) it absolutely will not focus at all. Is there something I need to be do...