I have been dabbling in photography for a few years now, but just really got into it this year with my first photography class. I know that shooting at night with slow shutter speeds the I can't manually press the shutter release button as it will blur the photo. However, to use a remote release on my Canon EOS 650 I need to have a GR-20 grip with remote release port. Where would I be able to find one of these? Thanks.