I used the 500mmF4 and 2x extender for the following shot of a male Ring Necked Duck. One must use manual focus with this combination on the Canon 7D as auto-focus will not work at f8. The images taken with this setup were not tack sharp either because I missed the focus point, because of subject motion, or because the 500mmF4 and the 2x extender are not compatible. Some report excellent results with this combination while others are unhappy. Based on discussion with other Canon prime lens users, I do think that the 2x extender is a much more viable accessory for the 300 f2.8, and I have seen a lot of outstanding results with this combination, but I have gotten unacceptable results more often than not with a wide range of Canon models, including the 10-D, 30-D, 40-D, and now the 7D when using the 500mm with this extender.
|Male Ring Necked Duck-Pothole Directly Across Road From Middle Creek Lake|
I used the 1.4 extender and 500mmF4 for these photos, which yielded somewhat better results, but one still needed to be closer so the photographs would not require as much cropping to obtain satisfactory subject size.
|Snow Geese And Northern Shoveler Drake|
|Male And Female Norther Shoveler|
Black Ducks, and Ruddy Ducks were also seen today, but I did not get acceptable photographs of them. In past years I have photographed or filmed numerous other species in these potholes such as Pintail, Gadwall and Scaup.
I leave you with another thought on extenders. While I find the 1.4X to be satisfactory with the 500F4, nothing can replace being close enough to shoot without an extender or severely cropping the image, but sometimes we do not have that choice and the extender can save the day.