Contest: Depth of Field & Focal Length
Several times over this past week I’ve been asked the same question about depth of field and how it relates to focal length? I find most photographers have a hard time understanding the relationship between these two. One of the people who asked me this question was a mentor student of mine, a really sharp engineer type. I had a bit of trouble explaining myself so we set up a small demonstration in his living room to prove my point. The problem was I was proven wrong…. or so I thought. So here’s the question:
You’re shooting at 18mm at f/4, then you decide to shoot the same subject with the same magnification (meaning the subject fills the frame in the same way) at 200mm at f/4. What happens to your depth of field?
Here’s what I want you to do. I would like you to leave your answers or your thoughts in the comments below. Don’t Google the answer – that’s cheating. Work it out in your head with what you know about photography or do an experiment of your own! Tell us why or how you came up with your answer. I will then pick a winner from the right answers on Friday and award you with a prize. I haven’t found a prize yet but I think it’ll be nice. If you need clarification of the question let me know and I’ll try to clarify it below. What are you waiting for? Get with it!
UPDATE: I promised you a great prize for the winner – and I always keep my promises. Think Tank Photo has graciously given us an Urban Disguise 40 as the prize for the winner! That is a $175 value and a great bag!