Review on 📷 2 Pack DK-23 Eyecup Replacement Eyepiece for Nikon D7100 D7200 D300 D300s - Eyecup Sedremm Camera for Improved Visualization by Sean Maples

Your DK-21 is exactly the same as Nikon OEM DK-21. Perfect fit for my D200. It doesn't fit my D7100, but it should work with the DK-23. You are different. The DK-21 is slightly longer than the eyepiece opening. Since I had two of these I modified one to fit the D7100 by sanding the bottom ends and trimming the rubber. Now D7100 fits and will be my backup. I was hoping to use this on the Minolta XD-11, but the grooves in the viewfinder are 19mm while Nikon's are 22mm. Suitable but not reliable enough. All Minolta SRT and X cameras share the same 19mm eyepiece. Next time I will try the 18mm Canon EF on Minolta. UPDATE: I also bought the EF version and after a bit of work with the Exacto knife it fits very well on older Minolta SRT and X cameras. I still need to do a small mod to use the XD-11 eyepiece to fit the release lever. Great fit and good quality. Can't beat the price.