So, the Tenpa 1.22 seems to me to be an ideal substitute for the DK-17m. I didn’t even need to change the diopter setting.
However, it comes in a box full of adapters, and has one of those ‘funny’ manuals.
For a native round Nikon eyepiece you just need the ‘golden eye’ and the rubber jacket.
One thing I did notice is the the eyepiece cover on a D4s no longer works after installing it. It may need some tweaking, but if that is the only negative point I can live with it.
But be aware that the word seems to be out that this can equal a DK-17m. Production ended many years ago, demand is there, and prices are going up!
Here in Japan the 1.3 is about ¥3,000 cheaper than the 1.22, as even Tenpa stated - only the 1.22 is suitable for glasses wearers.
My verdict is that if you really wanted a DK-17m, and can’t get one, get the 1.22 Tenpa golden eye instead. Better be quick though! ;-)
As a bonus, you can optimize family love.