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Friday, March 21, 2008
image about whole imaging systemThe Business end of the lens
Accurate focusing is needed doe the very fast lens. At f2.8 the sharp focus zone is about 20/1000 mm! Focusing by hand is a pure Lottery. I have TCF-s focuser and its temperature compensated, so thereis no need to refocus every time when temperature drops.
The focusing system has been build from the scrap metal and some parts found from
Its very easy to move the focuser back and forth between main scope
and the lens.
There is a right size can lid bolted down to a L-shape body.
Focuser is then atattched to the lid.
In a focuser, there is a brass tube. This tube goes back and forth when focuser moves.
Its then rotate the focuser ring of the camera lens. There is peace of fine sandpaper glued
to the tube to prevent slipery, tube has allso a spring load for the same purpose.
I have used TCF-s focuser but it can be any focuser, even manual one!
It will make focusing easier and less random.
The whole project took about three hours of time and cost 50c (I had to buy
The whole assembly is then attached to the dowetail rail at top of the LX200 scope.
This is a second version.
The firs version was made by blywood, but I made it again with metal doe flexsure problems.