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nerd.:)
i have a canon powershot sd750. can u do this on a digital camera?
Answer
It's going to be darn hard to "de-focus" too much using a point and shoot digital camera while keeping the main subject in sharp focus. The smaller the sensor, the greater depth of field you will have. Generally speaking, the smaller the camera, the smaller the sensor. Your SD750 has the small 1/2.5" sensor. Most of the pictures you take with a digital camera are quite sharp from near to far distances and there is a reason for that which I will explain.
While we speak in terms of the 35 mm equivalency of digital lenses, don't forget that the digital sensors are usually smaller than a full-format 35 mm frame. Most of the more popular point and shoot cameras have the smaller sensors. It's only about 5 mm wide and 4 mm high. The 3X lens required to cover that angle of view is an ACTUAL 6-17 mm zoom lens. At these focal lengths, the background is going to almost always be in pretty sharp focus.
In other words, if you WANT to defocus the background, you are going to have to work pretty hard at it. You would have to zoom to the longer end of the lens and set the aperture open as wide as it will go, if your camera even allows you to control the aperture, and get pretty close to your main subject while having the background a fair distance away.
Put your subjects quite a distance in front of any background that will be visible in your photo. You could use a garden of flowers and stand your subjects 20 yards or so in front of them. Try the portrait mode to shift things towards a larger aperture, zoom the lens out all the way, and move YOURSELF backwards or forwards in order to frame the picture as you would like it. In summary, you want to use a longer telephoto length, position yourself as close as you can to the main subject to compose properly, and place the main subject as far from the background that you wish to have out of focus as you possibly can.
The bigger the sensor, the easier it will be to achieve pleasing bokeh. This means moving to a dSLR, which all have sensors about 20 times bigger than the typical P&S digicam. If you want to really go for brokeh (very bad pun intended), you can get a Canon 5D and you will get exactly the same effect you are accustomed to in a 35 mm camera, since the sensor is the same size as 35 mm film.
Here is an example with a point and shoot camera, although it does have the larger sensor (1/1.8") that makes it easier to blur the background. Even though this is macro mode and f/2.8, where the background should blur the most, it's not terribly blurry because it's relatively close to the subject.
http://www.flickr.com/photos/samfeinstein/872732755/
Here is an example with a point and shoot camera, so it CAN be done. The background is much farther away, though, and this is the larger sensor size.
http://www.flickr.com/photos/samfeinstein/843563558/
Compare that to this image, though, which has a similar subject-to-background distance. The SLR has the obvious advantage.
http://www.flickr.com/photos/samfeinstein/408446616/
Wikipedia does pretty well on the subject of depth of field. See: http://en.wikipedia.org/wiki/Depth_of_field
See also: http://www.photo.net/learn/optics/dofdigital/
See also: http://www.flickr.com/groups/dof/
It's going to be darn hard to "de-focus" too much using a point and shoot digital camera while keeping the main subject in sharp focus. The smaller the sensor, the greater depth of field you will have. Generally speaking, the smaller the camera, the smaller the sensor. Your SD750 has the small 1/2.5" sensor. Most of the pictures you take with a digital camera are quite sharp from near to far distances and there is a reason for that which I will explain.
While we speak in terms of the 35 mm equivalency of digital lenses, don't forget that the digital sensors are usually smaller than a full-format 35 mm frame. Most of the more popular point and shoot cameras have the smaller sensors. It's only about 5 mm wide and 4 mm high. The 3X lens required to cover that angle of view is an ACTUAL 6-17 mm zoom lens. At these focal lengths, the background is going to almost always be in pretty sharp focus.
In other words, if you WANT to defocus the background, you are going to have to work pretty hard at it. You would have to zoom to the longer end of the lens and set the aperture open as wide as it will go, if your camera even allows you to control the aperture, and get pretty close to your main subject while having the background a fair distance away.
Put your subjects quite a distance in front of any background that will be visible in your photo. You could use a garden of flowers and stand your subjects 20 yards or so in front of them. Try the portrait mode to shift things towards a larger aperture, zoom the lens out all the way, and move YOURSELF backwards or forwards in order to frame the picture as you would like it. In summary, you want to use a longer telephoto length, position yourself as close as you can to the main subject to compose properly, and place the main subject as far from the background that you wish to have out of focus as you possibly can.
The bigger the sensor, the easier it will be to achieve pleasing bokeh. This means moving to a dSLR, which all have sensors about 20 times bigger than the typical P&S digicam. If you want to really go for brokeh (very bad pun intended), you can get a Canon 5D and you will get exactly the same effect you are accustomed to in a 35 mm camera, since the sensor is the same size as 35 mm film.
Here is an example with a point and shoot camera, although it does have the larger sensor (1/1.8") that makes it easier to blur the background. Even though this is macro mode and f/2.8, where the background should blur the most, it's not terribly blurry because it's relatively close to the subject.
http://www.flickr.com/photos/samfeinstein/872732755/
Here is an example with a point and shoot camera, so it CAN be done. The background is much farther away, though, and this is the larger sensor size.
http://www.flickr.com/photos/samfeinstein/843563558/
Compare that to this image, though, which has a similar subject-to-background distance. The SLR has the obvious advantage.
http://www.flickr.com/photos/samfeinstein/408446616/
Wikipedia does pretty well on the subject of depth of field. See: http://en.wikipedia.org/wiki/Depth_of_field
See also: http://www.photo.net/learn/optics/dofdigital/
See also: http://www.flickr.com/groups/dof/
What Kind Of Camera Is Suitable For An Individual Starting Out In Photography?
Mika
Im 18, Never really taken professional pictures but i would like to start. What kind of camera would be good for me to start with? I hate digital Cameras there not that good. Im looking for something, with a reasonable price and would fit me nicely as a beginner. Taking all kind of pictures....
Answer
If you're looking for a film camera, I would highly recommend the Nikon FM2. You can check it out on Wikipedia here:
http://en.wikipedia.org/wiki/Nikon_FM2
This is a reasonably priced camera that would be great for someone starting out and for advanced photographers as well. It is all manual and doesn't even need batteries to operate. Little watch type batteries run the exposure meter, but even if they go down, you can keep taking pictures if you know enough about photography to guess your correct exposure.
You can get a nice used camera outfit on ebay for anywhere between $150-$300. You don't need an expensive camera to take amazing pictures, it is the lenses that more affect picture quality in the world of film cameras. No matter what camera you buy, think about getting a good used camera and use the money you save to buy nicer lenses. It will make a world of difference in the quality of your photos.
Canon and Olympus also make some good film cameras, but I just don't know enough about them to give you a reference.
If you're looking for a film camera, I would highly recommend the Nikon FM2. You can check it out on Wikipedia here:
http://en.wikipedia.org/wiki/Nikon_FM2
This is a reasonably priced camera that would be great for someone starting out and for advanced photographers as well. It is all manual and doesn't even need batteries to operate. Little watch type batteries run the exposure meter, but even if they go down, you can keep taking pictures if you know enough about photography to guess your correct exposure.
You can get a nice used camera outfit on ebay for anywhere between $150-$300. You don't need an expensive camera to take amazing pictures, it is the lenses that more affect picture quality in the world of film cameras. No matter what camera you buy, think about getting a good used camera and use the money you save to buy nicer lenses. It will make a world of difference in the quality of your photos.
Canon and Olympus also make some good film cameras, but I just don't know enough about them to give you a reference.
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Title Post: how do you make pictures blurry in the background but the object in focus?
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