Nikon F100 diopter lens - how to identify?

[tkamiya]

On Nikon F100, one can have a diopter correction lens in the view finder. Does anyone know how to identify if one is installed and if so, what power? The one I have have no markings on it, yet turned all the way to minus direction, things aren't perfectly clear. I never had an issue like this with any other cameras Nikon or other brands. I do have strong near-sightedness but I do wear glasses when I shoot. Weird....

 

[CGW]

Any chance the built-in diopter adjustment is busted?

 

[tkamiya]

Seems to work, as I pull and turn the knob, the display does go fuzzy to almost sharp.

 

[ann]

the scew in type usually have a small marking of the edge indicating which power it may be, it screws into the eye finder.
the built in kind turns and you make the adjustment from the toggle.

 

[CGW]

Probably misunderstood but is there a screw-on diopter eyepiece in place?

 

[tkamiya]

That's the very question I'm asking. The piece that screws in IS there. The problem is, I have no idea if this is a kind with diopter adjustment or just a plain glass.

No marking what-so-ever, Ann.... "The toggle" on right side of the view finder is maxed out all the way to "-" side and it's still not enough.

I just unscrewed what's on there and placed it on something. It appears to be a regular glass.

 

[ann]

if it has a built in one, and someone has added another, there will be a serious issue, I will go dig mine out of storage and take a look.

I did use a screw in type for years, but have forgotten when nikon began making them as a built in.

sounds like what you unscrewed might be just the glass. I will get back to you when i check my f100

 

[CGW]

Could the focus screen be misaligned?

 

[Ian C]

See page 63 of the F100 manual for details about the diopter adjustment.

http://www.cameramanuals.org/nikon_pdf/nikon_f100-2.pdf

It has an internal diopter that can be varied from -3 to +1.

Additional adjustment is available by installing external fixed diopters of -5 to +3 instead of the plan glass screw-in eyepiece.

The standard configuration is a coated flat glass eyepiece at the rear. The internal diopter is varied by turning the diopter adjustment knob.

If the user’s prescription is outside to the -3 to +1 range then, instead the user leaves the adjustment at 0 and buys a fixed diopter of -5 to +3 and install the fixed diopter in place of the plain rear lens to obtain the diopter correction marked on the screw-in fixed diopter.

As it is described, it sounds like the camera is currently in the standard configuration.

So long as the user’s prescription is within -3 to +1 diopters the built-in adjustment should accommodate his eyesight.

If his or her eyesight is outside of this range, say, -4, then the user needs to purchase the -4 diopter eyepiece and install this instead of the plain eyepiece. The adjustment should be left at 0 or slightly displaced as needed to obtain the sharpest view.

 

[tkamiya]

Thank you Ian. I found -2 and -3 at B&H. This is so odd. I am very near sighted but I do wear glasses. This is the only camera body where default adjustment isn't sufficient. I have it all the way to the limit on minus range and it needs tad more. I'm thinking of buying -3 and use the built-in one for slightly more power.

 

[ann]

your eye doctor should be able to tell you what you need for your "viewing" eye. As if you don't get the right one, it won't help. I used the screw in type for years and as my glasses changed i had to change diopters. Am clueless what happened to the old ones.

 

[tkamiya]

Ann,

As I turn this knob 'thing' counter clock wise, (toward the minus sign), it runs out of adjustment. In this case, do I need plus kind or minus kind of diopter lenses?? I can tell it's ALMOST there.... just little more is all I need.

 

[ann]

makes sense

 

[tkamiya]

Success! I just received and installed -2.0 diopter corrective lens. Now I can turn the "knob" and bring the focusing area to sharp focus. (yes, I took utmost care in not poking my eyes when adjusting the knob.... )