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The DK-21M magnifies the finder image by approx. 1.17x.
DK-21M Magnifying Eyepiece 4.1 5 7 7
excellent companion for my d5100 it improves the viewfinder and is very helpful when focusing it`s always on my camera February 21, 2013
Excellent tool for it's price! Used it on D40 & D5000 - viewfinder picture is clear and sharp and appears much bigger easy to attach DK-21M extends a bit making camera handling a bit easier definetely recommended, price is ok as well worth trying February 2, 2012
Worth it for me Just bought it today and was installed in-store on my D7100. I immediately noticed I could actually now see the info at the bottom of the viewfinder instead of just blurs. Also helps keep my face from smearing up the big lcd screen. Two birds down with one new eyepiece. As much as I like it, $30 is still $30. Half that would have been better. It's staying on my camera full time. Easy to install. Does what it says. January 28, 2014
Good enough PROS: Bigger image. You can read the data in the viewfinder on baseline CONS: Little eyepiece glass so you need to put your eye very close. Poor eyepiece ergonomic design, it can be fall out. March 11, 2012
It also fits the D5100 I just put this eyepiece on my D5100, and though it does not make a huge difference, it is significant enough to make it well worth the few dollars it costs, and a very welcome upgrade to my D5100. It really helps to focus on long zoom shots. It stands about 1/4 inch further back than the rubber eyepiece that comes on the camera, which is also better; it gets your face off of the monitor screen. And in contrast to what I've read on some reviews from other websites, it does not take away from the area of view of the viewfinder; at least not on the D5100. I can easily see the entire rectangle, and what's inside it, better than without it. It is now a permanent part of my D5100; I will never take it off!!! March 5, 2012
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DK-21M Magnifying Eyepiece
 
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Will the DK-21M not also fit the D5100?

Feb 28, 2012 by
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I noticed that the D5100 is not listed in the compatible cameras list for the DK-21M eyepiece magnifier; why not???
2 years, 1 month ago
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Anonymous
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Answer: 
The DK-20C is NOT for viewfinder magnification; it is a correctional eyepiece for people who wear glasses. It does not serve the same purpose as the DK-21M; entierely different products, and if you do not need glasses but put it on your camera, you will not be able to focus. However, upon trusting referrals from other Nikon users who said all dx cameras use the same eyepieces (they are interchangeable), I went ahead and ordered a DK-21M for my D5100 last week, and got it today; it fits and works perfectly with the D5100, and is a very welcome upgrade to it's viewfinder; well worth the few dollars I paid for it!!! I will never take it off my camera; it is now a part of my D5100.
Mar 5, 2012 by
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Anonymous

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Answer: 
But the DK-20c is for eyeglass correction; my camera has a diopiter, and I don't wear glasses, anyway. I simply want a magnifier because of the D5100's tiny viewfinder. I don't think you answered correctly; the DK-20c and the DK-21M are not for the same purpose.
Feb 29, 2012 by
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Anonymous

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Answer: 
DK-20C is the correct eyepiece.
Feb 29, 2012 by
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JoeR
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DK-21M Magnifying Eyepiece
 
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what is the eye piece magnification?

Aug 10, 2011 by
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JUdy
Maryland
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2 years, 8 months ago by
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JUdy
Maryland
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Maryland
Age: Over 65
Favorite Subject: Nature
Nikon Family: 21+ years
Role: Serious passion, hobbyist
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Answer: 
For DK-21M, it's 1.17X , or in other words, magnifies whatever you see in the viewfinder by 17%. I posted my review on it here. Cheers.
Aug 21, 2011 by
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Malaysia Truly Asia
Malaysia
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Malaysia
Age: 35-44
Favorite Subject: Travel
Nikon Family: 11-20 years
Role: Serious passion, hobbyist

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Answer: 
It is 1.17x magnification.
Aug 10, 2011 by
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NikonStaff
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DK-21M Magnifying Eyepiece
 
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What's the magnification of this?

Jul 14, 2011 by
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Renee
Nashville, TN
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I'm currently debating between this eyepiece magnifier and the DG-2 Eyepiece Magnifier.
2 years, 9 months ago by
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Renee
Nashville, TN
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Nashville, TN
Age: 25-34
Favorite Subject: Portrait
Nikon Family: 0-1 years
Experience: 1-3 months
Role: Serious passion, hobbyist
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Answer: 
It is 1.17x magnification.
Aug 10, 2011 by
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NikonStaff
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DK-21M Magnifying Eyepiece
 
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Issues when wearing glasses?

May 14, 2012 by
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I've heard a wide range of comments from glasses wearers. Some say it cuts off the outer area of the viewfinder. One person said it was great with glasses. Another said that he didn't have to wear his glasses when using the accessory.

Does anyone have any experience with the magnifying eye pieced and glasses?
1 year, 11 months ago
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Anonymous
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Answer: 
DK-21M gives excellent enlargement of the Nikon D5100 viewfinder. It fits the eyepiece perfectly mechanically without interfering with anything. All of the viewfinder including the finder screen and the LED display is visible at the same time. You must however hold the eyepiece close to your eye. With glasses you will not be able to see the complete viewfinder.
May 15, 2012 by
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Robert
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DK-21M Magnifying Eyepiece
 
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Will this work in the D5100? It doesn't say in the "compatible with" section.

Aug 9, 2012 by
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I think It will, because it also works with the d3100 and the d7000, but can anyone confirm this? Thanks!
1 year, 8 months ago
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Anonymous
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Answer: 
Here are compatible eyepieces: http://www.nikonusa.com/Nikon-Products/Photography-Accessories/DSLR-Camera-Accessories.page?#!/tag:7WA:Eyepieces%20and%20Viewfinders/product:25478:D5100
Aug 10, 2012 by
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JoeR
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DK-21M Magnifying Eyepiece
 
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The Dk-21M is listed to work with the D600. Does it still allow full view of the image inside the viewfinder?

Jun 15, 2013 by
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Joe
Portland, OR
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Does this perform properly on the D600 or will it crop the image or the info inside the viewfinder?
10 months ago
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Joe
Portland, OR
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Portland, OR
Age: 35-44
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Nikon Family: 2-5 years
Role: Serious passion, hobbyist
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Answer: 
When using the DK-21M with D600, the viewfinder frame coverage is reduced and a portion of the viewfinder display is obscured. Photographs are unaffected.
Jun 17, 2013 by
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NikonLaurence
New York
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DK-21M Magnifying Eyepiece
 
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Does the DK-21M need the DK-22 in order to be attached to a Nikon D3200?

Feb 11, 2014 by
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2 months, 1 week ago
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precog
Favorite Subject: Landscape
Nikon Family: 11-20 years
Experience: More than 10 years
Role: Serious passion, hobbyist
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Answer: 
No, the DK-22 is for use with the DG-2. Just slide off the old eyepiece and replace with the DK-21M
Feb 11, 2014 by
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JoeR
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Will this DK-21M crop out the 100% coverage in my D7000 viewfinder?

Apr 7, 2014 by
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I am looking for a magnifying eyepiece that only magnify what I see in the viewfinder. I wonder if this DK-21M works properly as I have expected, or it will reduce the 100% coverage on my D7000 viewfinder.
 
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1 week, 5 days ago
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PCH
Age: 18-24
Favorite Subject: Travel
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Answer: 
You will lose about 15-20% of the image because the image is enlarged 1.17x
Apr 7, 2014 by
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JoeR
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