|
|
| *SoulEyes Photography>>>Landscape Photography |
Photography course, need to take 3 photo of landscape show Depth of feild? |
I put a car in to focus on with different f/stops and shutter speeds I am stumped. my intention is to slhow varying depth of field. It isn't too difficult when you first look at the assignment ... but wait! You need to shoot with your lens wide open, shut as far down as it will go and then in the middle of the f/stop range; all this while obtaining a precise exposure. Okay, let鈥檚 say that your lens has a range of f/stops from f/4 to f/32. You set the shot up so that the near object (the car in this case) is just a few feet away from the camera. At f/4 you expose the film (or sensor in a digital camera) with the rear quarter of the car in focus and the foreground and background very out of focus. With the lens stopped down to f/32 you focus the lens one third of the way into the photo because as you know from point of focus the apparent focus at small apertures extends one third forward and two thirds back. The last shot will be at f/11 at the same focus point. These three shots will demonstrate the varying depth of field as apertures are changed. Now here is the real challenge. What ISO film do you use to ensure that at f/4 the film is not overexposed and at f/32 (if you are shooting in lower light than direct sun you may want to use a tripod) it is not underexposed given the lighting conditions at the time you shoot your subject? Since over exposure is gong to be the thing you want to avoid, you should start the exposure range at the f/4 setting. Let鈥檚 just say that you use an ISO film (sensor setting) of 100. That would mean that in bright sun the exposure would be about 1/2000th sec @ f/4, 1/250th sec @ f/11 and 1/30th sec at f/32 Most modern film cameras will have a 1/2000th shutter speed. This means that you cannot use a film speed higher than ISO 100 to ensure that your depth of field demonstration is successful. I think this will get you going for this assignment. It is a good one, but I think we cheated a little 鈥?;) Source(s): Pro-photog, nerd, etc Best subject: line of trees, a fence, a brick wall. Photograph the subject not front but from one of the ends towards infinity. Try to use lower ISO possible, or use ND filter of 4X. Camera on tripod. Take one lens wide open (adjust speed for proper exposure) Take another half way closed (again adjust speed for proper exposure) Last one close the lens completely (again adjust speed for proper exposure) |
Photography Categories--Copyright/IP Policy--Contact Webmaster |