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Please don't take photos here.
Literal
Here [at-で] photos [object-を] take-not [polite-request-でください].
~ないでください is the polite negative request — 'please don't X.' Built from the negative te-form ~ないで + ください. 写真を撮る ('to take a photo') uses the verb 撮る, a specific kanji for 'capturing/recording' (also used for 録音, recording sound). A common sign you'll see in museums and temples.