Baader 2" BDS-RT Diamond Steeltrack RT Focuser for Refractor Telescopes

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Oct 26, 2019
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Fitting a 2-inch BDS-RT Baader Diamond Steeltrack Focuser to a Teleskop-Service GSO 8-inch Ritchey-Chretien


The TS 8-inch RC has M90x1mm connections at the focuser end of the scope. My setup has a TS
50mm extension adapter with for 6- & 8-inch RC connected to the scope (TS part no: GSRCV50),
to accommodate the long back-focus.
Attached to this is a TS M90 tilting adapter flange (TS part no: GSRCJ90). This is an aid to
collimation and allows the long axis of the focuser to be aligned with the optical axis of the scope.
I then have a standard TS monorail focuser for the RC, again with an M90x1 connection.
Image 1 shows the 50mm extension and tilting flange, with the old focuser removed. Note the M90
male thread at the end of the flange, to which the focuser connects.
Fitting the Baader Diamond Steeltrack RT
It is assumed that the reader has access to the Steeltrack manual and has purchased the necessary
RT-Adapter M90x1 Diamond Steeltrack (Baader part number 2957283).

1. The Steeltrack RT is supplied with an M68 adapter as standard. Remove this by loosening
the M5 screws around its outer edge. An M88 dovetail is exposed. See Image 2.

2. Connect the new RT-adapter to the Steeltrack, tightening the M5 screws sufficiently to hold
it in place, but still just rotates. Note that the thumbscrew from the M68 adapter can be
transferred. See Image 3.

3. Connect the Steeltrack to the tilting flange, rotate the focuser to the desired orientation, then
tighten the thumbscrew to lock it in place. If desired, the M5 screws around the edge of the
M90 adapter can be tightened for a firmer grip. See Image 4.

After fitting the Steeltrack, I can confirm that the focuser has the full 80mm inward travel.

This above method should still be applicable, even if a tilting flange is not present, as M90x1mm
connections are standard on this size of RC. However, with only the 50mm extension in place, it
may be that the focuser will not move the final 5mm of inward travel, depending upon the size of
any baffle at the junction of the extension and the scope.
Note that an alternative method is not to transfer the thumbscrew from the M68 to M90 adapters,
but to use the all the standard screws.

October 2019
(see customer's images under the product description; Zoltan, 365Astronomy)
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