I'm glad I didn't toss away the little box that came inside my FR/FF.
I've only had a chance to use it once, and wondered why mine didn't look the photos.........
It did a "good job" not perfect, but good across ~85% of the field. Again tonight I was wondering why mine only read "AT 0.8 Reducer/Flattener " on the barrel. I looked at the closeup photos at Astronomic's site and saw a collar that was missing on mine that read "for 115 APO". I went through the box again and noticed something rattling in the little box I thought was just "packing filler".
Inside was a spacer ring with the "For 115 APO" label........I "assume" that I need to thread it on the end of the barrel to get the correct spacing for the 115 as shown in Astronomic's photo.
Edited by 17.5Dob, 14 February 2019 - 09:42 PM.