The Canon 300mm f/4 L USM is a great old lens. I often forget how fun it can be to shoot at longer focal lengths. The 300 f/4 L came out in 1991 and has since been superseded by an Image Stabilized version. Most photographers swear by IS. I really could care less about it. I've shot IS lenses before and I can't see the benefit outweighing the cost for me at this point. I like how light this lens is. I can sling it over my shoulder and not worry about getting sore. This lens feels lighter than the Canon 70-200 f/2.8 L (again, no IS) if that helps put it's weight in perspective. I recently took it down to the Dana Point harbor to see what I could create. I don't own a 1.4x or 2x extender so I was shooting at 300mm in the most accurate way possible. Using a 6D, there was no crop factor to account for either. I bet this lens would be amazing on a 7D. I was lucky there weren't a lot of people down at the harbor. I don't really like walking around with long white lenses as they often draw attention. As I walked, I came across a variety of great opportunities to use the longer focal length. I thought I'd share some of the photos from the day here.
Here are a few shots of a Cormorant I found while walking. I guess it was sunning and didn't mind me being about 10ft from it. Got in nice and close for this portrait with the ocean in the background. I love the color the sun put on the bird's chest.
This next sequence was gifted to me as I was just about to leave. I saw this Great Blue Heron stalking along the rocks just in front of where I had parked my car. I got pretty close, I could have shuffled closer, but then he found a fish and I just had to stabilize and go for it. The sun was going down behind the breakwater and I had already accounted for it.
I'm hoping to get out more with this lens. I'll try to post more when I do.