matt
22-12-2006, 03:50 PM
Guys
Can anyone tell me what causes the focus knob that comes standard with the Celestron 9.25 to "stiffen" or tighten up at exactly the same point in its rotation?
I've made sure the rubber knob isn't pressing up against the outside base plate. As far as I can tell it's not coming into contact with that at all.
So it must me something internal? For most of its 360 degrees it turns quite loose, but then at the same point in every turn it stiffens up a bit.
Many thanks
Can anyone tell me what causes the focus knob that comes standard with the Celestron 9.25 to "stiffen" or tighten up at exactly the same point in its rotation?
I've made sure the rubber knob isn't pressing up against the outside base plate. As far as I can tell it's not coming into contact with that at all.
So it must me something internal? For most of its 360 degrees it turns quite loose, but then at the same point in every turn it stiffens up a bit.
Many thanks