AlexAntao

Thank you !!!! I was looking for it a whole day and found almost nothing....

Sorry to raise this old topic, but I found it because I have the same problem here. Have a CElestron 7-21mm eyepiece and a T-Ting for my NIkon. I'm Almost shure the T-Ring has M42 internal thread, I think the pitch is 0.75mm, but I'm not shure. I'll try to include pictures. Eyepiece hass about 37mm thread, so I think it 's M37... but i know there's the question about the pitch of the thread... Did you found a solution ???