1. By grafting in another eyecup another lens can be induced to form from the overlying layer.

2. An eyecup is called an eyebath in Britain.

3. Traditional rubber eyecup: for eyeglass wearers it can be folded down. It is less durable.

4. Without the eyecup in place, eye position did become somewhat more critical, although I still had little trouble getting my eye in the right spot to fully view the field.

5. ED glass, sharp to the edges, excellent in its category, eyecup adjustable.

6. First focus the reticle with the image field border by turning the eyecup.

7. First focus the reticle with the image field boundary by turning the eyecup.

8. I noted no kidney beaning and little in the way of excessive blackout effects unless I folded down the rubber eyecup.

9. However, I would still judge the eye relief as fairly adequate, as I did not have to press in on the eyecup at all to get the full-field with my bare eye.