Eyepiece threads

[Kenny]

Interested in others advice/experience.

Bought a set of moon/planetary filters from Astronomia but they only fit some of my eyepieces.
- Filters don't fit the 25mm and 6.5mm eyepieces that came with my cheap "Event Horizon" scope I bought on ebay years ago but I didn't expect them to. It's a cheap Chinese knockoff. Both eyepieces have a thicker thread that only fits the rubbish moon filter that came with the scope.
- Filters do fit the unbranded 40mm, 32mm and 10mm Plossls I was given with my Orion dob, I think they were purchased separately from the dob.
- Filters partially fit (won't fully screw on) the 25mm, 9mm Orion-branded Plossls that were purchased with the Orion dob. This is the biggest surprise for me, that the Orion eyepieces don't have a standardised thread that fully fits the filters.

Do all eyepieces these days have a standardised thread? ie if I bought more the filters would fit?

My Orion Skyquest dob is probably at least 10-15 years old. Could that be the issue? ie threads weren't standard at the time of manufacture?

[mickw]

Do all eyepieces these days have a standardised thread? ie if I bought more the filters would fit?

Nope

The threads are a total shambles, a mix of imperial an metric threads which are never explained when you make your purchase.

You will have fun trying to get it sorted  

Oops sorry, was thinking of something entirely different   

[The Thing]

All my 1.25 and 2 inch filters fit all the appropriate eyepieces. They have a standard thread. They come from a wide selection of sources.