There are also four headless set screws around the back end, which apply force to the brass ring. They are used to minimize play (flop) in the sliding function. If necessary, set them so that the sideways movement is minimized - but so that the tube can still be pulled back and forth with an almost barely acceptable amount of friction.
If you don't reach focus, you can also move the front lens back and forth by 12 mm when opening the knurled locking ring that holds the lens in place. So even if all the back end is locked tight, still camera-focus can be corrected by rotating the objective lens-cell forward or backward after having loosened the locking ring. For loosening, the locking ring must be rotated clockwise when you look down onto the objective.
This may seem a little bit crude, but we wanted a stiff and sturdy solution - so that even a heavy guiding camera cannot cause flexure in the system. Other focusers for such small optics are either made of plastic or wobble anyway. They are good enough for visual use, but nor for guiding.
However - the distance to the focal plane of the camera will need to be extended - consider to order a T-2 40 mm extension ring: http://www.baader-planetarium.com/en/baader-t-2--40-mm-extension-tube-(t-2-part-25b).html
What is the weight please for the Counterweight calculation.
Baader Multi-Purpose Vario-Finder 10x60
The optical data of the lens:
- 61 mm aperture with BAADER Phantom Coating® Group
- Focal length 250 mm
- Focal ratio 1:4.1
The technical data of the Vario Finder:
Possible applications of the BAADER Multi Purpose Vario Finder:
Scope of supply:
- BAADER MultiPurpose Vario Finder 10 x 60mm
- 45° AMICI Prism for erect image
- 25mm eyepiece with illuminated measuring recticle
- EQ dovetail with ¼" photo thread
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