second mirror holder for reflector
photo below is the typical sub mirror holder of newtonian sold in the market.
The mirror cell is hold by
the center screw through the hole of the holder. Three small screws are
pushing the cell.
When you want to adjust
the tilt angle of the mirror like below.....
The second mirror will shift
away from the center position in the typical mirror holder system like
Because the tilt center
is away from the secondary mirror.
So you must adjust the
length of the spider also.
Following photo and section
figure are my idea to solve this problem .
The tilt center is much more
close to the mirror compared with the typical holder.
The mirror does not tilt
in the center screw any more. The mirror cell is combined to the center
screw with brass wire (sticked with solder)
As the mirror is tilt
at this brass wire, so the amount of shifting is very small.
You don't have to worry
about the metal fatigue of the brass wire because the tilting amount is
rather small at optical adjustment .
This system is easy to