you dont have your camera with you but see the perfect moment? then you run inside to grab it and your tripod and when you come back the moment has gone
just happened to me, the moon was low (never seen a full moon so low) and the storm clouds had created a perfect frame so the moon had blue sky behind it but the foreground was storm cloud (black black sotrm clouds) by the time i got my gear the damn clouds had covered the moon, i waited another hour and those damn clouds kept coming
not to mention it was smack bang dead centre in my lane way so the buildings on either side would have also added to it, ohh and the lighting was absolutely perfect


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