Thanks for all the impressions Jim, the build quality looks fantastic! I hope you find more bino fits (and longer screws for the AEs). They look very nice on your Galileans.
This design could possibly have threads added to the adapter OD to attach a dew shield; is that what you meant above?
Our local sky is clear this evening, good conditions predicted, and of course many fine nebulae in the south early at night. My adapters are in transit but should be here by the next viewing opportunity.
Working with Harry Siebert has been outstanding. His optics are in some of the finest observatories on Earth, yet he's extremely approachable, collaborative and efficient. He really does things his own way. I admire that.
A group of us are travelling to very dark skies at 4400' elevation early this summer, so I'll post my experiences (also with narrower filters) then.
Jim, being the true gentleman and scholar that he is (and a terrific partner in this project), will undoubtedly do thorough and reflective testing and reporting in the meantime. I'm sure he'll consider all the angles and give this project the best chance for success in the field.
I hadn't thought about thread-on or slip on dew shades for the adapter bodies themselves, but that's a good idea,
I was actually noticing that the female threads of the filters (allowing you to stack filters) are exposed and pointing skyward in this adapter design, and figured that shades could be designed that threaded into these exposed filter threads.
Thanks for the kind words, but I was floored when you invited me along for the adventure with these adapters. I think you deserve the lion's share of any credit due as you had the desire and the drive to figure out how to get it done in a context where, if it works out well, it could easily be evolved and offered commercially to everyone interested by your prototype manufacturing partner.
Nothing but rain for me all night and this morning. Per the current forecast it's looking like Wednesday or Thursday before we get any real clearing. That means that there's a chance you'll actually manage nebulae observations from Holland before I manage them from California. So much for California's rumored endless sunshine.
My first truly darker sky opportunity with these will be at the end of March. I'll be headed to Arizona for a Messier Marathon, and figure I'll take the adapters and the 7x35s along to share with others as it's an organized event with many active observers.
And thank you for the opportunity to participate. As for "Project Gilgamesh" (adapters for larger binoculars) the three screw attachment mechanism of these prototypes actually could work pretty well. Unlike with smaller/narrower binoculars (the Galileans or any small roof prisms) where the screws have to be carefully positioned to avoid hitting body when you set your IPD, larger binoculars, especially Porros, have more clearance. Fancy compression ring type attachment mechanisms are a neat idea, but simpler is probably better from a cost and manufacturing ease perspective.
I am going to try and fit in a trip to the hardware store today to find some longer screws and adhesive backed felt.