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Thread started 02 Jul 2009 (Thursday) 16:40
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What is DIOPTRIC Adjustment?

 
MikeFairbanks
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Jul 02, 2009 16:40 |  #1

On page 36 of the Rebel XS (D1000) there is a section that says,

"Adusting the Viewfinder Clarity: Turn the dioptric adjustment knob left or right so that the seven AF points in the viewfinder look sharp."

I know where the knob is, however...
What exactly does this do? Does it change the way the camera focuses, or does it simply change the way things are seen through the viewfinder?

I thought the viewfinder showed exactly what the lens was seeing.

Are the little black boxes and dots only in the viewfinder? This would make sense since they obviously don't show up on the pictures.

Finally, HOW SHARP should the dots be? The little boxes in the viewfinder (seven on the XS) are very sharp, but the dots? Not so sharp.

Any advice on this is very much appreciated.

Thank you.

Mike


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Citizensmith
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Jul 02, 2009 16:43 |  #2

If your vision is off using the dioptic adjustment helps to compensate. Similar to wearing glasses. Basically you adjust it depending how far your vision is from 20:20.


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MikeFairbanks
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Jul 02, 2009 16:45 as a reply to  @ Citizensmith's post |  #3

But does it affect the way the lens focuses, or just the viewfinder.

I'm confused.

For the record, I have excellent vision (which is surprising, since I'm 40 and both my parents wore glasses by this age).


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urbansickness
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Jul 02, 2009 16:45 |  #4

People with different "strength" eyes can adjust the view finder, or people with glasses that dont wear glasses when shooting.



  
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number ­ six
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Jul 02, 2009 16:49 |  #5

MikeFairbanks wrote in post #8214011 (external link)
But does it affect the way the lens focuses, or just the viewfinder.

I'm confused.

For the record, I have excellent vision (which is surprising, since I'm 40 and both my parents wore glasses by this age).

It has no effect on the lens or the picture you take. It's just so you can see the image in the viewfinder clearly.

-js


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MikeFairbanks
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Jul 02, 2009 16:52 as a reply to  @ number six's post |  #6

So in a sense it's important for being able to focus, right?

I'm slow. Bear with me.


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Jul 02, 2009 16:55 |  #7

no, if you have hte diopter completely out of focus when you look through the viewfinder, and focus on an object, as long as you get the focus point on it, it will be in focus in the picture.

you just won't see it clearly through the viewfinder.


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urbansickness
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Jul 02, 2009 16:56 as a reply to  @ MikeFairbanks's post |  #8

it doesnt affect the cameras focusing. but it allows you to see clearly what it has focused on.

it the viewfinder wasnt set up for your "eyes" and you looked through the viewfinder and autofocused, you would see a blurrey image and then you may manually adjust the focus but when you uploaded the pictures to your computer they would be blurred.



  
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Jul 02, 2009 16:57 |  #9

For seeing what you are focusing on, yes.

Everyone's eyes are so different, even from my left to my right, in my case. If I'm shooting with the right eye I can judge the image in the viewfinder better if I have the diopter at -3. The left could do fine without adjustment, with glasses it's the same setting for both eyes.


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Jul 02, 2009 17:00 |  #10

yeah, don't worry about the image you're looking at through the VF when adjusting it, just worry about the focal points (the little boxes) being as clear as possible.


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siriusdogstar
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Jul 02, 2009 17:07 |  #11

the lens focuses on the focus screen from the lens side. the viewfinder focuses on the focus screen from the eye side. use the diopter adjustment to bring the focus screen into best focus. since the AF squares are on the focus screen, use the diopter adjustment to make them sharpest.




  
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MikeFairbanks
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Jul 02, 2009 17:14 as a reply to  @ siriusdogstar's post |  #12

Thank you. All that makes perfect sense now.

What about the little dots inside the viewfinder? I'm talking about the dots that turn red when something is in focus (I use center focusing only right now).

Should the dot (when black) be sharp?


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tkbslc
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Jul 02, 2009 17:48 |  #13

MikeFairbanks wrote in post #8214051 (external link)
So in a sense it's important for being able to focus, right?

For manual focusing it is important, but for autofocus, not really.

The dots will prob not be as sharp as the lines, no. It is also helpful to look at the settings display inside the viewfinder. if those little numbers for shutter speed, etc, are sharp then you should be in business.


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number ­ six
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Jul 02, 2009 19:46 |  #14

MikeFairbanks wrote in post #8214051 (external link)
So in a sense it's important for being able to focus, right?

I'm slow. Bear with me.

Yes and no. If you want to focus manually, you need a sharp viewfinder. But this adjustment does nothing at all to the autofocus, which will work fine regardless.

-js


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Jul 02, 2009 20:28 |  #15

Not meaning to hijack this thread, but if one wears glasses, does the dioptric adjustment knob still need to be adjusted?


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What is DIOPTRIC Adjustment?
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