Exposure Lock (AE-L Button) is the abbreviation stands for Automatic Exposure Lock. It is useful using automatic and semi-automatic shooting modes. Where has this information been all my photographing life? So freaking helpful it's not even funny.
Re-use plastic bottle tops to tightly seal food bags. Cut off wide-mouth plastic bottle top just at crest. save the cap. slip over bag opening. top toward the open end. Fold bag over bottle mouth. cap with re-used bottle top. easy to seal and pour!