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12-27-2008, 07:02 AM   #1
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Basic focus question

What does it mean when posts talk of front focusing and back focusing? My only lens at the moment is the 18-55 Mk II that comes with a K20D kit?

12-27-2008, 08:18 AM   #2
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QuoteOriginally posted by tigershoot Quote
What does it mean when posts talk of front focusing and back focusing? My only lens at the moment is the 18-55 Mk II that comes with a K20D kit?
Back focusing is when when you try to focus on one object, but then look at the picture and find that the area *behind* the object is actually more in focus than the object itself. Front focus is the same, but the area in 8front* of the object is more in focus.

When this happens, it indicates a problem with the camera and/or the lens. But this is totally different from and completely unrelated to the complete normal thing that everyone experiences - sometimes when you point the camera at something and want the camera to focus on it, the camera simply *chooses* to focus on something else instead. That's not a camera defect at all. It's only a defect if you can *prove* the camera really tried to focus on a given subject but missed. And that's why special focus test charts exist to help people test for this.

Last edited by Marc Sabatella; 12-27-2008 at 11:26 AM.
12-27-2008, 09:08 AM   #3
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Thanks Marc - I was beginning to think it was something to do with the focus ring on the lens - and whether it was to the front of the lens or at the back! I am a little rusty on all things SLR at the moment.
12-27-2008, 11:08 AM   #4
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Excellent description, Marc!

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