Darrensnk

I've managed to look through them, the 40 and 25mm are quite clear and give nice images (for my amateur eyes). The 12.5mm not so much unfortunately. I held it to the light and looked through it to see a web of something so I tried to take a photo.

I tried cleaning the outside lens but it is still there. Would it be worth a professional clean if that's possible or is it sadly a lost cause.

Thank you all for the information

Thank you for the information and the link to the adaptor. This might be a silly question but it the add for the adaptor it says requires additional back focus. Does that mean I need to buy something else also to use it.

Hello, I'm new to astronomy and came across these eyepieces. Being in need of some I bought them so now just trying to find some information on them. Most things I find are "volcano" eyepieces which people seem to think highly of, just wondering if these would be similar. I haven't tested them yet as I need to buy an adaptor now.  Any info will be greatly appreciated. AH 40mm K 25mm OR 12.5mm all have a sticker with a T in a circle and Japan on it. Thanks