Length of the 2" to M54 adapter supplied with the EFW2 wheel?

[juliangeorgeshaw]

Q1: What is the optical length (i.e. the length after you have screwed it in both ends) of the 2" to M54  adapter which is supplied with the EFW2 filter wheel?

Q2: 2" is the same as T2, right? So I can screw in T2 extension tubes into the Atik supplied adapter?

Thanks
Julian