No age penalty for a telescope that has been stored well. It should work just as well in 100 years as now, if stored inside and protected.
You have awesome photos for a new guy! Pictures are so helpful.
One more tip - put something in your personal data for your location. Knowing your rough location is also useful to the community for recommendations. Doesn't have to be your street address....rofl.
Happy to hear that. Thanks for the note, I have updated my profile info. I'm from Japan
The rings appear to be some kind of adapters/retainers?. Do your 1.25in eps fit in the one with the retaining screws? Is it threaded? It looks like you found a kit. It may fit on the end of a focuser drawtube to retain a diagonal, etc. That is a guess.
Thanks for your explanations.
Yup, the eyepieces can fit into the one with screws and its threaded. but it doesn't fit the telescope.
As you have guessed, the eyepieces were in one kit (bought on Japans' auction). Besides, there wasn't any information about the kit, it was on auction under "camera lens" category. I think the seller didn't quite understand what these pieces can be used for.
The term is long-focus, achromat. Your scope is an “achromatic doublet”. Because it has a long focal length, we call it “long-focus”.
Where did you get those eyepieces, and have you measured and confirmed they have 1-1/4” barrels?
I agree with those saying you need a 90 degree diagonal.
Another possible option is to replace the visual back (black part threaded onto the chrome draw-tube) with a 1-1/4” visual back, then buy all 1-1/4” accessories.
Thanks for the correcting me about the term. I got them separately from the telescope. To be honest, I don't understand this 1-1/4" thing but the eyepieces fit into the barrel with no problem