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Old Jul 22, 2009, 1:51 PM   #1
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Default Night shots and Infinity Focus with Sony Alpha DSLR 200

Can anyone out there let me know if the Sony DSLR A200 can be set to infinity focus and how to do this?
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Old Jul 22, 2009, 1:59 PM   #2
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Welcome to the forums.

Just switch to Manual Focus and turn the focus ring on the lens if you're unable to lock focus on a distant subject. But, keep in mind that some lenses will focus past infinity to allow for tolerance issues at various focal lengths. So, you may want to back off a tad from the infinity setting on the lens.

The Hyperfocal Distance should be relatively short at wider focal lengths anyway, depending on the type of night shots you're interested in. See this Depth of Field Calculator for more info (and if you enter in a Camera, Aperture and Focus Distance, it will also calculate Hyperfocal Distance for you, which is the distance you can use and have most of the scene in focus).

http://www.dofmaster.com/dofjs.html

Here's a shot showing the MF/AF switch. You'll want to set it to the MF position to use Manual Focus. Then, turn the focus ring on the lens to infinity and back off a tad to make sure it's not going past where it should for infinity at a given focal length. At most focal lengths, you'd have a bit of "play" in how close you need to set your focus anyway, due to relatively short hyperfocal distances if your subject is closer to infinity in comparison to the needed focus distance to keep your subjects at infinity sharp.



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Old Jul 22, 2009, 2:02 PM   #3
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Thanks!
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Old Jul 22, 2009, 2:06 PM   #4
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No problem. I see where you asked this in the Sony dSLR forum, too. So, I'll move this thread there and remove the other one so that all of the answers will be in the same place.
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Old Jul 22, 2009, 2:12 PM   #5
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P.S.

Make sure to come back and share some of those night shots. ;-)
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Old Jul 24, 2009, 8:31 AM   #6
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What exactly is infinity focus used for?
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Old Jul 24, 2009, 8:38 AM   #7
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When you want a distant subject to be as sharp as possible. When you use Autofocus, you shouldn't need to worry about it.

But, if the camera's Autofocus is unable to lock focus on your desired subject (because it's too dark), then manual focus can be used instead.
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