C11, colimation issue

[bojan]

I have DIY focuser (I made it for my 10" Newt), only adapter for C11 is still missing

[Marke (Mark)]

I'll be getting a C11 edge very soon but will be using a motorised crayford and just leaving the mirror locked .

[bojan]

Working on adapter to fit my Crayford on C11...
Anybody could confirm the optimum focal plane distance from 2" collar is 5"475?

I contacted Don from Bintel with question about threads & pitches...
Below is what he came up with, it may be usefiul for someone:

2" Filters 48mm x 0.6mm
1 1/4" Filter 28.4mm x 0.6mm

Meade Large SCT
3.25" 16TPI without adapter
2" 24TPI with adapter fitted

Celestron SCT
3.3" 16TPI without adapter
2" 24 TPI with adapter fitted

T Thread 42mm x 0.75mm

Takahashi 2.7" Focuser 72mm x 1.0mm
Takahashi Sky 90 55.9mm x 0.75mm

Atik 11002 Camera front 54mm x 0.75mm

QHY Filter wheel in and out 54mm x 0.75mm

Takahashi Finder scope light M8 x 0.75mm

Vixen VC200L Focuser rear thread 60mm x 0.75mm

GSO 8" RC rear cell 90mm x 1.0mm

Web Cam adapter M12 x 0.5mm

EQ6 Pro altitude adjusting screws M12

[billdan (Bill)]

Thanks for that list of thread sizes Bojan, however I am confused with the 2 inch filter thread pitch.
I thought the 2 inch filters are 48mm x 0.75mm thread pitch.

[Merlin66 (Ken)]

Bojan,
I agree with Bill re the 2” thread size.
I’ve see that 5.475” measurement mentioned before for Celestron....

[bojan]

This is what Don from Bintel send me... maybe his typo?

I will ask...