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Old Sep 8, 2010, 3:43 PM   #1
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Default Presbyopia and manual focusing

1. I use 0.75 dioptre glasses for my presbyopia.
2. My new camera has a dioptre correction dial.

My question is: how can 1. plus 2. affect manual focusing?
Should i use the glasses?
How can I relay on what i see through the viewfinder?
Thanks.
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Old Sep 8, 2010, 4:30 PM   #2
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You should be able to get along with the diopter adjustment without the glasses, or with the glasses without a diopter correction. Either way, MFing shouldn't be any more difficult for you than for someone with normal vision, as long as you get some kind of focus confirmation in the viewfinder. Because current focusing screens don't have the same tools that were common with MF SLRs, MFing isn't as accurate as AFing anyway. Are you sure you want to MF?
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Old Sep 8, 2010, 5:04 PM   #3
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Not sure of who i am TCav. Thanks for your help.
Well... MF gives me a quick pin point focusing where i want. To select an AF single point i need to push two bottons and dial a ring. Not the end of the world, but...
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Old Sep 8, 2010, 9:28 PM   #4
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Manual focus works better with close-ups than landscapes or more distant type shots. The diopter adjustment is to allow you to do without glasses and keep your eye closer to the VF. The eyecup should block outside light and let you get a better view than you would wearing glasses without the diopter adjustment.
Since nearly no cameras are diopter adjustable to my prescription, I have to use glasses. Fortunately, even with manual focus, I get a focus lock indicator with my camera, and the focus point is selectable with a switch.

brian
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Old Sep 9, 2010, 12:47 PM   #5
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Yep VT! That was the answer to all my existencial troubles! Adjusted the camera to select spot single point focusing in manual with a single button. No glasses. Thanks.
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