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How to correct diopter
The viewfinder eyepiece is neutral and not adjustable. But you could install an extra Nikon DK-20C diopter corrector onto it with the viewfinder kit in the box.![](https://cdn.shopify.com/s/files/1/0471/6062/3259/files/image_1024x1024.png?v=1629357156)
install the viewfinder kit
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- Nikon DK-20C diopter range:-5 ~ +3
- -, negative for nearsighted
- +, positive for farsighted
- You could refer the glass degree and divide 100 to calculate the diopter
The diopter of updated Mark I is neutral. And the diopter of early batch SL42 Mark I is native -3 and you could adjust it based on this diopter.
The viewfinder kit is also available for Nikon DK-21 eyecup.