Strolling on the Beach
I was very surprised to find that one of my (not-so-freshly-pressed) posts was featured on WordPress Freshly Pressed. I started thinking about what post I should follow up with to hopefully meet the expectations of any new followers, etc. I’m humble enough to realize that I’ve got nothing but photographs that *I* like — and hopefully others will like many of them. What’s the Ansel Adams quote? Something like “There no rules for good photographs, only good photographs”. And of course “good” is defined by personal taste. So…I’m just posting the next picture I had already planned to post in hopes that others like it too 🙂
On a recent trip to the Texas coast I was setting up for some bokeh shots with the 50mm f/1.4 and noticed this couple approaching. I quickly focused on the sand and recomposed to catch them as they passed in front of the camera. I said a quick ‘hello’ but otherwise pretended to ignore them and clicked off a couple of shots as they were in the frame.
My camera was already at what I considered a good aperture for this situation — f/2. From experience I knew that anything larger and the background would be too blurred to provide enough detail to give a sense of where the shot was taken. I had already experimented with some f/1.4 shots taken at a very close distance from the subject and the background was completely lost. For all you could tell, I was in a bright room inside my house as opposed to the beach. Sometimes that’s a nice effect but when I’m at the beach I typically want to show, or at the very least hint strongly, that I’m at the beach.
I knew my focus wouldn’t be perfect. With such a shallow depth of field it usually doesn’t work to recompose your image since you end up swinging the whole plane of focus away from the subject [see below for a short, lame-ish explanation of that]. I had no time to worry about that nor did I care for this shot since I didn’t really want to capture any detail of the couple — I was going for the overall scene of “some couple” walking on the beach. With the blown-out highlights and backlighting a precise point of focus wasn’t going to matter much anyway. I’m not wild about the composition but again, this was a hurried, serendipitous shot. The almost-opaque frame around the image was something I added while experimenting with OnOne Software’s Photoframe. I’m not sure if I like it but I’m considering this one “done”.
About those depth of field issues when recomposing a shot…When you focus your camera on a particular point, imagine a plane that is perpendicular to line between your lens and subject. Everything on that plane (including everything near the plane within the range of your chosen depth of field) will be in focus. Taking that further, if you focus on a subject 10 feet away it will obviously be in focus, but so will anything on the flat plane (NOT arc) which goes left and right from that point. [Here’s an illustration — not sure how helpful] When you focus and then rotate the camera (recompose) that whole plane moves. If you have a large depth of field (ie small aperture and/or fairly large distance to the focus point) that may not matter because the subject remains within the in-focus region even when you rotate the plane. If the depth of field is very narrow there’s a good chance that you end up moving the subject out of the in-focus region (actually you move the plane of focus away from the subject as you rotate it). I’ve seen a great illustration of this somewhere…I’m not able to find it with a couple quick internet searches though.