Lacerta 1:10 micro transmission for Skywatcher Crayford focusers
... trouble-free installataion - focuser does not need to be dismounted - adjustable
The 1:10 micro focuser units have proven very useful in daily use. Especially for astro photography, they allow very smooth focusing. TS herewith offers a micro transmission to retrofit existing focusers. Retrofitting can happen with the focuser mounted to the telescope.
The 1:10 fits, for instance, to the following telescopes:
-- All Crayford focusers with four base screws in a distance of 33 x 22 mm
-- Skywatcher: ED Refractors, Newtonians, Dobsonians, Black Line telescopes
-- Vixen: ED 80 and ED 100
-- Orion USA: ED Refractors, Newtonians, Dobsonians
and many more. We appreciate to give closer advice if needed!
What is the specialty of this micro-transmission?
Present upgrade versions, like the William model, are often fixed to the focuser with only one screw. No fine adjustments are possible. A tilt of only 1/10mm can lead to non-uniform travel - many focusers with micro transmission suffer this problem.
This micro transmission has a pressure plate (see picture above) allowing fine adjustment. Even the gear axis can be aligned.
Why is a precise alignment essential?
Simple Crayford focusers have to screws: one for friction, one for locking the current position. The friction control screw can bend a simple non-adjustable pressure plate easily and smooth run isn't possible any more.
When the distance between axis and tube can be fine adjusted and the pressure plate is solid enough, a higher pressure can be applied without making the travel unround.
Maximum load capability of the Crayford focuser:
With the micro transmission, not only the travel itself becomes more precise. The overall stability is increased, too. Loads of more than 3 kg are held in position without any problems.
Is motorizing the focuser furthermore possible?
Yes. The new base plate is not thicker than the existing one.