I purchased my photography equipment about 15 years ago and at the time was too busy with work and unable to spend much time using it. I have a Canon EOS 20D and a Canon 100-400 zoom lens. I am taking time to practice with this camera equipment in various settings before deciding which camera is the best as an upgrade. I will stay with Canon since I have several Canon lenses already. I recently was able to spend a day near Galveston TX photographing shorebirds along the gulf coast. Has anyone tried the mirrorless cameras? I was wondering how they compare to the DSLR's.