200p primary locking screws do nothing?

[miguel87]

I'm not sure I am referring to them with the right name.

I have the 200p explorer. The black tube.

I can collimate well enough with the three primary mirror screws. Then next to each screw is a taller, narrower, finger screw that just touches up against the mirror if tightened.

I fail to see how these screws do anything?

If I tighten them too much surely I will move the mirror? If they are loose they are obviously doing nothing. If they are just touched up against the mirror what are they even doing? 

Thanks ✌

Edited June 3, 2020 by miguel87

[Jiggy 67]

These screws are to lock the mirror in position, they are not for collimating, just to lock it. I tighten mine as much as possible and they don’t move the mirror. As for how effective they are, that’s debatable and probably one of the reasons you have to collimate before every session 

Edited June 3, 2020 by Jiggy 67

[John]

I don't use the locking screws unless I am transporting the scope in the car. Once I got the primary collimated I found that the locking screws were actually putting it out again so I leave them loose in general use. 

 

 

[Jiggy 67]

50 minutes ago, John said:

I don't use the locking screws unless I am transporting the scope in the car. Once I got the primary collimated I found that the locking screws were actually putting it out again so I leave them loose in general use. 

 

 

Yeh, I said mine don’t move the mirror, what I should have said is that I have to tighten each one a little at a time to keep collimation. This is where a laser comes in really useful 

Edited June 3, 2020 by Jiggy 67