Guide :Optics : Optics

Inoperative focus control

I have a DSX 102 meade telescope that I cannot focus. The focus knob turns several revolutions from stop to stop, but there is no focus.

Research, Knowledge and Information :

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2001 Ford Focus: cruise control isnt working..fuses..brake pedal

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2013 ford focus tsbs ... the cruise control, on some vehicles, may be inoperative due to steering wheel wiring harness with diagnostic trouble code (dtc) ...
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Control.Focus Method (System.Windows.Forms)

Sets input focus to the control. The Focus method returns true if the control successfully received input focus. The control can have the input focus while not ...
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How to: Set Focus in a TextBox Control | Microsoft Docs

How to: Set Focus in a TextBox Control. ... The following example calls the Focus method to set the focus on the TextBox control with the Name tbFocusMe.
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Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage ... Electrical | ECU > Cruise Control not working, checked all switches ...
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.net - textbox.Focus() not working in C# - Stack Overflow

Why do you say it's "not working"? ... When Select() does not work for you: Often some other control takes the focus. So ensure that your call to Select() ...
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Suggested Questions And Answer :

What IC's uses the control of the focus motors

I'm assuming you will change these ICs yourself and that's why you're asking. If you have access to the circuit board, then you should be able to find some numbers on the IC which you think is blown. If you can pull that IC and look at it's underside you may be able to find a number you can search on the internet for. Or you can find a number on the circuit board itself and maybe find the company that made that board and contact them to find out the IC you need. You can probably find an IC match as long as the pins are in the same order and the voltages are the same. Good luck!
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I can not get the telescope to focus. The viewfinder will not focus in. and can't see anything out of the out of the optical tube.

This type of telescope is viewed from the small tube at the rear. Use the longest lens you have. Most people think that they need magnification, but that is not accurate. A 5 mm lens will only have 1/6th the field of view (how much sky you see) compared to a 30 mm. The picture below was taken through a 50 mm lens.
Read More At : ETX-90EC (325 x 90mm) Telescope...

Focus knob problem

Have repaired a few of these ...some whells have tiny set screws to tighten, some are a two piece wheel that loosens up sometimes, if not that then it is broken. if i can be of further help...15088331232
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Can't focus my meade etx-125. have turned focusing control more than 80x in both directions. Is there an stop on the focusing system. Originally had the electric focusing system on the scope couldn't focus then either. I have tried both indoors and out doors.

Yup there is a mechanical stop to prevent you from cracking the mirror by retracting or extending it too far.. once you break the pin off it needs to go to the factory for dis-assembly as they have to remove the primary to get to it and realign it my 105 did same thing....word of advise use a cable extender for focus not an electric focuser they fail to tell you that it can over run the built in stops making your scope useless...i may be mistaken but i believe the max turns is 25 or about for end to end focusing adjustment on the 125
Read More At : ETX-125EC (500 x 127mm) Telescope...

Binoculers do not appear to be focussing properly.

Binox have a prism in each barrel to invert the image. When dropped or banged around the prisms may move in their mounts creating the problem you present. I have opened binox and reset the prism effecting a correction, but IF you unit is nitrogen filled you will be losing that anti-fogging benefit. If you choose to open your pair, check for movement in each prism, neither should be loose. Once you find the original proper placement, a drop of crazy glue does wonders - just a drop on one edge.
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Inoperative focus control

I'm assuming this is the Maksukov-Cassegrain telescope. Turning the focus knob CW should get you focus at infinity by moving the primary mirror away from the eyepiece. As you turn the knob it should move in and out relative to the real of the scope. If that's not happening the focus screw may have been turned CW too far and no longer be catching the threads in the rear plate of the scope. You may be able to get it to rethread by holding the front of the scope toward the ceiling and turning the knob CCW. Attached is a photo of what the scope looks like under the rear housing. To prevent the focuer shaft from turning in too far the knob should be firmly seated agains the rear of the shaft. I think on this model this is a friction fit. HTH, George
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I own the 80mm williams optics refractor, it's four years old and in very good shape never been dropped. The problem I'm having is the focuser is very loose and wants to slide all the way back to the end of its travel as if there is no friction holding it back. I can adjust the set screw to hold in place, but this makes it to where you can't fine adjust the focus. The slightest tilt upward will make the focuser inopertive. I heard somewhere that there was a simple way to adjust the slide fiction..If you can help it would be greatly appreciated.

Post this question on the REFRACTOR TOPIC on discussion forum.
Read More At : ZenithStar 80 Telescope...

I have a 4.5 inch reflector 500mm focal length. I know it is basic but a planetary eyepiece should give a reasonable yet small image of saturn. I have bought a 4mm Celestron plossl for this. The eyepiece will not focus. The eyepiece hits the stop at the bottom of the focuser and when I wind it in it hits the end of its range just before the image comes in to focus. I am gutted as I was looking forward to a view with the higher quality optics. does anyone have any suggestions to remedy this. I can only think of shortening the tube on the plossl. Which seems longer than necessary.

If you pull the eyepiece slightly out of the focuser can you then come to focus? If you can just lock down the eyepiece at that point -- or buy this:
Read More At : Bushnell...

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