siebert contest guess

i'd guess that 2 parts of the corrector contain 2 elements each and that there is at least 1 spacer, so the whole assembly comes apart in at least 3 usable pieces, more or less resulting in:

by combining all parts you get 1 mag
by combining all parts, but flipping one of the element parts you get 1 mag
by combining the 2 with the elements in them you get 1 mag
by combining 1(either) part with an element and the spacer you get 2 mags
by using one of the parts with elements in it in reverse, you get another mag.

seems to me like the basis of this oca could be something like a pair of specially designed barlows that allow you to double stack them, use them seperate or use at least one of them in reverse.

ds

by

We must have been on the same wave length. You beat me to the punch. I hope this is correct.

Good luck,

- Tim Hornbeck

My guess is that it contains the negative doublet that can connect to the front of the binoviewer by itself(2x). Then can be used with the standard OCA(1.5x). There is a sliding internal double (I am guessing the negative one that is on the lower side of the adapter that can move the negative elements farther from the reducing elements. to acheive the other magnifications.
Chad