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Adapters and Threads

Inspired by a thread in the IceInSpace forum I have done this table as an overview of different adapters and their threads.

It could be a pain to find the correct adapters with correct threads when you need to connect different accessories to your telescope and camera.

This is what I have came in contact with, but be aware that it's not so easy to find out what kind of thread it has, it could have been some mistake in the table. Double check!.

If you find something wrong, let me know: Contact

Description Threads size
telescope side
Thread size
camera side

Pentax to 1.25"

M42x1.0 F


ocular adapter

Riccardi 2.5" 0.75x Field Flattener

M63x1.0 F

M63x1.0 F

with 0.75x reducer

Riccardi adapter

M63x1.0 M
M68x1.0 M

M48x1.0 M

connects to 3" focuser with a reducer

Thread reducer

M92x1.0 M

M63x1.0 F

reducer to focuser

Meade, Altair, TS, Orion 3" 1x Field Flattener

M92x1.0 M

M80x1.0 M

fits direct to some 3" focusers

T2 adapter

M42x0.75 F

camera dependent

camera adapter

Pentax M42 thread


M42x1.0 F

Pentax standard

M48 adapter

M48x0.75 F

camera dependent

camera adapter

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