same photo multiple challenges

Yes, it's up to the hosts.  Some specifically ask for new pictures while others are silent on the matter, meaning that they don't mind seeing same photos.  I personally don't enter the same photo in more than 3 challenges and space them out as much as I can as no one wants to see the same thing over and over.

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I lug my photo equipment everywhere. Is it heavy? Sure. Is it uncomfortable and cumbersome? Absolutely. Is it often an inconvenience? You bet. But is it all worth it? Maybe.