How do I prevent the camera shutter from working when no film or lens is loaded?
The Safety Release Lock prevents shutter release if there is no film loaded or if there is no lens attached. When you press the shutter button without film or lens, <F> (film) or <L> (lens) will blink in the viewfinder and on the LCD panel. (Page 44)
From the official Canon Eos Rebel T2 Camera manual, page 44
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