AMOMENT
TPF Noob!
- Joined
- Sep 27, 2011
- Messages
- 701
- Reaction score
- 48
- Location
- NY
- Can others edit my Photos
- Photos OK to edit
I'm reading "Understanding Exposure...I believe it is the 4th addition and was written in 1996. He speaks of some DSLR'S having aan auto-depth-of-field scale "with these cameras, you can autofocus your foreground, autofocus your background, and the camera will then beep only if your range od DOF is greater than the aperture choice can offer. If the camera should beep, chances are good that you're focusing on too close of a foreground, so move back and focus again." page 38. I know my nikon d3100 does not have one but I do have a DOF calculator on my phone. In the cameras that do have these, what exactly do you do to make this happen and if using autofocus then how do you focus on your foreground and background separately? Don't you need to select your AF point and determine where in your frame you are going to focus, determine the aperture and focal length to increase or decrease your DOF depending on how much you want in focus, and the rest is done automatically? In other words, when using your autofocus system you can be in control of selecting which AF point to use and therefore where in the frame your focus is and you can adjust your aperture and focal length to determine how shallow deep your DOF IS? You have to know where your focus is going to fall no? In the cameras he is describing, it seems very different. Can someone elaborate?