One end of the rubber sleeve slides perfectly over the 2" diameter lens, while the other end slips snugly over the 20-60X Zoom Eyepiece. An internal ring separates lens from eyepiece w/ perfect spacing (at 20X magnification I can see just an edge of a vignette circle). At first I tried tightening the steel band around the lens, but it affects the focusing motor inside the lens, and its easy to get a lens error "Check to see if lens is properly attached". So I discarded the band and just used the rubber sleeve. A strip of electrical tape was wound around the end attached to the lens just to stiffen it enough to hold the lens more securely. Good news is that the rubber sleeve can stay on the lens at all times and act as a lens hood!
|American Goldfinch - 40X|
|House Finch - 20X|
|House Sparrow - 40X|
As soon as lighting permits I hope to perform a resolution test to compare the 18.5 mm f/1.8 on the 20-60X Zoom eyepiece with the 10-30mm f/3.5-5.6 lens on the 40X W eyepiece.