Image of the day

Captured by
Michael Scherman

Dual Clusters near Antares

My Account

New to Astromart?

Register an account...

Need Help?

6" Synta OTA Collimation

Started by ljaycox, 06/02/2004 05:22PM
Posted 06/02/2004 05:22PM Opening Post
I recently purchased a 6" Synta refractor that was highly regarded by its knowledgeable owner. In shipment the rear tube of the assembly was not covered and the tube and the inside of the primary attracted a fair amount of packing foam dust. When I went to disassemble the tube (take the lens cell out) I realized that this unit does not have the collimation screws in the cell. The entire cell un-screwed off of the threaded tube. I had to clean it, but i wonder if I can ever get this thing re-collimated. Can anyone point in the direction of some information on fixing this OTA or is this one now destined for mediocrity. I forgot to ask this question of the seller. I thought they all had the collimation screws in the push-pull configuration, had I known this I would have passed on it.
Thanks
Posted 06/02/2004 05:47PM #1

No worries! Take the time while it's apart to remove any Synta glue/grease/aluminum chips from the threads on the tube and the cell. (Use some alchohol or light solvents to clean up the threads.)

Then just screw the lens cell back on the tube. You can test collimation if you like, but there is certainly no reason to think it was any more precisely aligned before you removed it, than after!!

Posted 06/02/2004 07:10PM #2
Unless you took the glasses out of the cell, the
collimation should be the same. My experience with
these is that taking the lens assembly off the
tube does not change the collimation. I would
do a "star test" on the scope with a green filter
and pointing overhead. Unless it shows alot of
coma, I would probably leave the collimation alone.
Even though there are no collimation screws, it is still
possible (more difficult) to adjust the collimation by
shimming the edges of the glasses in the cell
(i.e. placing tiny bits of black tape where the lens
seats). They made these for a couple years before
adding the push-pull screws.