These accessories are some of the commercial astronomy products on my Copyscope. They are items that it doesn't make sense to build yourself. On the left is a 2 inch to 1-1/4 inch eyepiece adapter. To it's right a 1-1/4 inch star diagonal. Above the star diagonal is a 1-1/4 inch (barrel diameter) 26mm (focal length) Plossl eyepiece. The ruler is 6 inches long.