Hi Jeff - What mounting rings are you using for the 130?
Brian, I no longer have the scope but in the photo with the Losmandy GM8 I was using the old pair of stock AP rings (non-hinged). In the photo with the Vixen SP mount, they were some Synta based rings with a little extra felt. You tube O.D. is 6".
Here is my latest which is a 127mm Starfire recently serviced by Roland as the cement used between the elements aged, putting stress on the glass. During service, under partial warranty, he went ahead and refigured it, then put in the latest spacing oil. Said it will last at least several generations now. I also cut the tube back on this one to make it bino-friendly.
Did you get the scope yet?
Edit: This scope was in terrible shape when I got it. It had been left lying on a table in the old observatory for decades with both ends open. Dust and crud on both exposed surfaces to the point where you could not really look through the lens and the tube was full of spider webs. But I removed the lens from the cell and it cleaned up wonderfully, looking brand new. I've included a photo of the lens block, and it was indeed a "block" of glass with the cement. Note that it does not have Kapton tape on the edges, which is typically used in a lens of this vintage to stabilize the block and seal the edges since it is oil spaced . Roland and I both believe the deceased previous owner, who was a chronic tinkerer, replaced the oil with cement at some point. He did a good job but it was not durable and I could easily see the resulting turned edge in star and DPAC testing. Roland said when he initially set up the lens in the interferometer it gave a Strehl of .88 in green light and when he separated the elements, let them relax for a while, then set it back up in the interferometer, it came in at .94 Strehl. Roland felt he could do better and went ahead and refigured the lens. It now has a Strehl of .98 in green. It is a very sharp lens with, at best, scant "CA".
Don't ever give up on these old lenses!
Edited by Jeff B, 14 January 2020 - 08:49 PM.