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01-04-2010, 01:57 PM   #1
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K10D and depth of field

Hello.
I own a K10D with a smc DA 18-55mm lens. My concern is no matter what I choose for an aperture setting my depth of field seems to remain the same. Should I be concerned?
Also, the depth of field preview only seems to darken or lighten the frame rather than show any change in depth of field.

01-04-2010, 02:08 PM   #2
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Because the kit lens is quite slow, the DOF will never be very shallow. A lot depends on distance to subject and distance between elements in the picture.
Here's a link to a DOF calculator, you can use it to figure out how to set up shots so that you can see differences in DOF between apertures. - Online Depth of Field Calculator
01-04-2010, 03:05 PM   #3
Ash
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To see the biggest effect of a thin DoF using the kit lens, zoom in to 55mm, set aperture to f/5.6 (wide open) and shoot a subject that is very close to the camera with a background that is far separated from the subject.
01-04-2010, 04:01 PM   #4
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Thank you. My instincts told me I was expecting a little too much from my lens, but because I'm a beginner, I couldn't be sure. Very cool link, thank you.

01-04-2010, 04:02 PM   #5
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Thank you. I just tried your test and it appears that I am expenting too much from a slow lens. Any suggestions for a faster lens?
01-04-2010, 04:15 PM   #6
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The most obvious step up for speed is the Tamron 17-50 f/2.8 - cheap, yet versatile and good quality.
There's also the more expensive Pentax DA* 16-50, which is just excellent but leaves people questioning value for money. I personally think it's worth it and use it for all my jobs, big and small.

There's also the Sigma 18-50 f/2.8, which is also a cost-effective option.
Have a look at the lens review database for more information and user reviews.
01-04-2010, 09:13 PM   #7
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The Kit lens can "do bokeh" if you set up the shot correctly. Here is a kit lens shot, 28mm, f8. The close focusing abilities of the kit lens help when you want a shallow DOF.


01-04-2010, 09:21 PM   #8
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While you can get shallower DOF from an f/2.8 lens than from the kit lens, the above shot does show the kit lens can get shallow DOF effect in the right circumstances - like if you shoot your subject from up close but have the background be much farther away. If you really want to play with shallow DOF for artistic effect, though, I'd recommend skipping the f/2.8 zooms and going straight for a faster prime. The "A" series 50/1.7 is a great lens for under $100.

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