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08/20/2008 08:07:50 AM · #1 |
This is probably a really stupid question - but here goes...
When I adjust the clarity of the focus points in the viewfinder - using the Dioptric Adjustment - does it have any bearing on how the Camera focuses on the subject - or is it just for me to see clearer?
Reason for question - I sometimes wear glasses and smetimes contact lenses - and constantly have to adjust accordingly. I'm just worried it may affect the final pics if I forget to do it.
If the adjustment is just for me to see - ie the viewfinder clarity - then presumably I could have it blurred in the viewfinder and still get a good pic !!
Also - how does the camera 'know' its focused ??
Phil
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08/20/2008 08:18:02 AM · #2 |
It's my understanding that those adjustments don't effect the autofocus mechanism on the camera in any way. It could look out of focus to you through the viewfinder, but the camera will still be in focus. Now if you were using manual focus you would need to adjust the eyepiece accordingly.
Message edited by author 2008-08-20 08:18:33. |
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08/20/2008 08:30:14 AM · #3 |
The diopter should only affect manual focus in that that if the diopter were not spot-on sharp you may not be able to see through it well enough to manually focus accurately. The diopter is strictly there to adjust the viewfinder image for you, and should have no effect at all on the image captured.
There are several methods used for auto focus, but generally the camera looks for areas of high contrast in a scene. The more the contrast, the sharper the focus. So, it adjusts the lens until it sees maximum contrast. This is why it is more difficult to focus in some conditions than in others. This is also why you have multiple focus points available, so you can select the one that works. When handheld, however, if having trouble autofocusing, it is often easier to focus on a high contrast point at the right distance and then reframe the shot if needed.
Message edited by author 2008-08-20 08:35:32. |
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08/20/2008 08:44:07 AM · #4 |
| Thanks Guys...thats confirmed things for me.... |
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