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17

You certainly knocked the diopter adjustement out of place. It is there to compensate for people who need eye-glasses. With your eye looking through the viewfinder, adjust the knob on the upper right side until you see what is in focus clearly sharp.


9

The image in the viewfinder is focused on the ground glass screen. The focused image converges on a 2D plane. (It's not like binoculars.) When you look through the viewfinder, your eyes focus on the image on the screen, which is at a fixed (virtual) distance. You can use the diopter adjustment to change your perception of the fixed screen. Glasses or ...


5

Assuming you have a DSLR (or some higher-end mirrorless camera), you can add an eyepiece accessory to provide additional magnification (or minification, if you need negative adjustment). The adjustment in your viewfinder is measured in "diopters", just like an eyeglass prescription*, and as you note, the built-in adjustment can only go so far. But you can ...


4

Try gaffers tape if you never need to change the diopter. Set it and tape it down. I keep gaffers tape on the bottom of my body to protect it and usually a small piece on my lenses to tape the focus down for night photography and time-lapse.


3

“Diopter” in optical jargon is a unit of measure in common usage by optometrists and opticians. Thus the eyeglass industry uses this unit to specify the power of the eyeglass prescription. The photo industry has also adopted the use of the word diopter. The eyelevel viewfinder design has become popular. Your camera sports one; you hold the camera up to ...


3

Reversing the lens, when doing close-up photography is a valid technique. Non-macro lenses are optimized to image objects that might be at infinity or as close as 1 meter distance or anywhere in-between. In other words, the typical subjects are not flat but have depth. Conversely, the macro lens is optimized to image flat subjects like stamps etc. When the ...


3

This is really a personal setting. Even if you have "perfect vision", you want to set this to a custom setting for yourself. Put the camera on a tripod, autofocus the camera at something bright with good texture, and adjust the diopter to your liking. Some DSLR's have a marking at the "default" position, but not all. Personally I don't believe the default ...


2

It is possible for the image in the viewfinder to appear sharper at a different focus distance than when it appears sharpest in an image captured by the film (or digital sensor) in your camera. But it has nothing to do with your vision. If the focusing screen in the roof of the mirror box is a slightly different optical distance, via the mirror, from the ...


2

Yeah, there is no perfect setting really. And if there is a mid-point/default, it's generally just a reference to which way is +/-. It's not only for people with a difference in vision, it's also for people who use glasses while shooting. As said above, adjust it to your liking. After some googling it looks like you can get eye cups/pieces with a +1.0 or -...


2

It seems to me the bad design is hanging the camera from a part that was not designed from which to have the camera be hung. Have you tried a strap that hooks to the parts of the camera that were actually designed for a strap? A tripod socket is generally engineered to handle compressive forces. That is, it is designed to hold things up (E.g. your camera ...


2

This prescription is for -1.25 diopters (under "sphere"), plus some astigmatism ("cylinder" and "axis"). You won't find an off-the-shelf corrective piece to deal with astigmatism — usually we just ignore that. The add-on corrective eyepiece is designed so the nominal number is the result when used in combination with the existing adjustment in its neutral ...


2

I'm guessing you actually are seeing best when it is set to the other end of the adjustment range: +1 diopter. Just as someone can have 20/20 distance vision and need reading glasses with a positive diopter to see things that are close, even if you have 20/20 or better distance vision your eyes may no longer be able to relax enough to focus on very near ...


2

You could remove it altogether. Set the diopter wheel at the adjustment you desire. While holding the adjustment wheel to prevent moving it use a (correct size & type) screwdriver to remove the screw in the center of the wheel. Lift the wheel straight out of the housing. Replace the screw to close up the opening. If you don't want to do anything that ...


2

Can you put a small piece of gaffer's tape over it? Should be easy to cleanly remove when you want to. For some controls I've used a dab of hot glue, sometimes with a piece of teflon tape covering the knob surface itself. If you build up some glue against the teflon tape, then remove the tape, you can sometimes create a "semi-protected" state where it can ...


2

You need the minus two (-2) diopter eyepiece. If you read the link at Nikon, the corrective eyepieces are not cumulative. The OEM eyepiece on Nikon cameras with a diopter adjust wheel are -1.0. Adding the -2 diopter eyepiece brings it to -2 (and not -3). From the link for the -2 eyepiece above: "The eyepiece’s diopter value is, when combined with the ...


1

It depends on the nature and severity of your imperfect eyes. Not all eye defects are the same. With severe vision defects, you will never be able to tell whether the camera is in focus without correction. With mild vision defects that result in slight blurriness, you can focus by observing the image improve as you turn the focusing ring. At the point ...


1

Is there a way to permanently disable/fixate the diopter knob on pre-set value? I doubt it. The knob seems to be mechanical, and there's nothing like a "locked" setting. I don't think you'd want to remove it entirely because you'd have no way to fix it if it ever went out of adjustment, or if your eyes change. Perhaps the best solution is to arrange your ...


1

The dial doesn't lock on either of my Canons but it's not easy to knock. It's also quite easy to see the position so maybe you need to mark yours with a spot of paint. That will tell you if it's off and allow you to set it back to where it should be.


1

Agreed - my prescription is aprox -2, and the -2 eyepiece works for me.


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