Why don't you just step back a bit for a crop body? compared to a FF.

Started Apr 26, 2010 | Discussions thread
kb2zuz Veteran Member • Posts: 3,202
You're missing a couple things
  1. Perspective: You know how when you're a distance from someone you can cover their entire head with your thumb or holding up a quarter. Now if you left that same quarter where it can cover someone's head and backed up 5 feet, the quarter would no longer appear larger than the person's head. Backing up will compress the background more, if you wanted to have foreground objects stand out more, you'd want to get closer. Backing up changes the perspective, changing to a wider or more telephoto generally only changes the field of view or how much of the scene is captured.

  2. Sometimes you can't back up. Say you're in a small room and you'd use a 35mm lens on a 35mm film body or "full frame" dSLR to get a group of people in a shot. So now you use the same 35mm lens on an APS-C dSLR (1.6x crop) and you can't fit everyone in, so you try to back up but there's a wall behind you.

  3. Depth of Field. Depth of field increases with distance, the further out you focus the deeper your depth of field will be, if you want a shallow depth of field, backing up will reduce it. However using a wider angle lens will also increase depth of field a bit as well. This is one of the reasons people who want shallow DOF prefer "full frame" cameras.

Now if you're only photographing 2D objects none of this matters, and sure you can back up no problem. But unless you're photographing paintings, backing up will change the appearance of the image.

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