Might I suggest getting a cheap remote flash, radio popper and stand and setting it up by the feeder? It'll really freeze those hummers in place.
[ame=http://www.amazon.com/gp/product/B004GZRE1S]Amazon.com: Speedlite YN560 Flash for Canon, Nikon, Pentax, Olympus Cameras: Camera & Photo[/ame]
[ame=http://www.amazon.com/CowboyStudio-NPT-04-Speelights-extra-receiver/dp/B005IQRMN4]Amazon.com: CowboyStudio NPT-04 4 Channel Wireless Trigger for External Speelights with 1 Trigger and 2 Receivers (NPT-04+extra receiver): Camera & Photo[/ame]
Well, the stand is optional. If you've got a tripod, that flash can attach right to it, or some hardware clamps and/or tape can come in handy.
[ame=http://www.amazon.com/gp/product/B004GZRE1S]Amazon.com: Speedlite YN560 Flash for Canon, Nikon, Pentax, Olympus Cameras: Camera & Photo[/ame]
[ame=http://www.amazon.com/CowboyStudio-NPT-04-Speelights-extra-receiver/dp/B005IQRMN4]Amazon.com: CowboyStudio NPT-04 4 Channel Wireless Trigger for External Speelights with 1 Trigger and 2 Receivers (NPT-04+extra receiver): Camera & Photo[/ame]
Well, the stand is optional. If you've got a tripod, that flash can attach right to it, or some hardware clamps and/or tape can come in handy.