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Thread: Anybody mod their Etx?

  1. #71
    Southernskies10's Avatar
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    Default Re: Anybody mod their Etx?



    Looks like I am coming to the party about two years too late -- the idea of mods on scopes and videos of disassembly would be great. My own small ETX 60 is still working like a charm... but like anything mechanical --- that could end. Having looked at the scope --- I just have not got the resolve to crack open something without knowing exactly what I am doing.

    By the way, you mentioned the focuser knob issue --- thought of a simple mod that could help you extend the knob without removing the existing one. Use a length of silicone tubing pushed over the existing knob and if it needs securing, use a small cable tie. The other end will accept a home made knob and you could secure the same way... presto, home made focuser extention
    Southern tn likes this.

  2. #72
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    Default Re: Anybody mod their Etx?

    Can I have a biscuit please?? Now that is a heath Robinson affair! Great to see how inovative people can be!

  3. #73
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    Default Re: Anybody mod their Etx?

    How would you put a red dot finder on a ETX60? This is something id like to do! And if done where would be thebest place to put it?

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    Default Re: Anybody mod their Etx?

    Meade 125 ETX. Good Telescope (the telescope proper) The best mod I made was de-forking the unit, mounting the tube assembly on a german equatorial mount, and throwing the fork assembly and autostar in the trash.

  5. #75
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    Default Re: Anybody mod their Etx?

    I have moded my ETX70 with the electrical focuser for the ETX90-125 to get more soft focuser and with high precision focus... a little slow but very precise. I send photo on next post on this section.
    Best regards.
    Clear sky.

    Sebastien.

  6. #76
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    Default Re: Anybody mod their Etx?

    I bought this ETX RA90 a couple of years ago in a flea market. It had been stored in an attic for years, so of course the light baffle on the front lens had slipped sideways an inch or so. Was filthy and had water damage, and the battery holder and circuit board had battery acid damage.

    Completely dismantled everything, cleaned the optics, glued the baffle back on with two-part epoxy as mentioned here, and polished and greased the moving parts in the base. Then decided to repair and modify for this ETX a non-working (LX200?) Go To mount that had been given to me. It also had had a tough life...knobs had all been waaaay over tightened, breaking some internal parts. Bought the replacement parts from Don at Astro Parts Outlet (if you need something for a telescope, he probably has it) and got that mount working. Mounted the ETX with a homemade aluminum L bracket, and added a long piece on it so I could move the center of gravity forward to make up for the weight of a dSLR when needed.

    The original little finder scopes on these ETXs are virtually useless. The finder itself is actually pretty high quality...is just too small and set way too close to the back of the ETX. So I made an aluminum 1/8th inch ring to fit the ETX tube, and counter-sunk screws from the inside of the ring to the single-stalk finder scope from the original 5" reflector that came with the Go To mount. If you can't find a pipe the right size around which to bend the aluminum ring, just cut a circle of plywood the diameter of the tube and clamp it in a vise, or screw it to a larger piece of plywood, for a template. Buy a sheet of adhesive felt from Hobby Lobby or Michaels (look for the stiff kind...the very flexible soft felt is too thin), cut it the right width, and press it inside the ring after mounting the finder scope stalk. Rings like this can also be made to hold counter-weights or whatever.

    The hard dew shield is a 4" PVC pipe coupling, sanded and painted ultra-flat black, with felt added to the inside of the telescope side. I have two...the one in the picture below is the same kind of coupling, with an inside slip-fit end cap found at the same hardware store where I bought the PVC couplings. I cut out nearly all of the center of that cap and glued some solar filter material to it. It slips in (tightly), but I added the three screws for safety. The cover is a rubber-maid bowl cover that happens to fit perfectly!
    The dew shield and solar filter piece fit pretty well with the felt installed, but needed a short section (2 inches or so) of the felt doubled to tighten it up nicely. I put the short piece over the joint where the ends of the first layer meet. There is an opening on the bottom of the back plate on these ETXs, along with two mounting threaded holes. These all open clear into the mirror area. So, for solar viewing and photography, these need to be covered. You won't get dangerous blinding light through there, but there will be some glare into the tube if those are left open. Some people here have said to leave these uncovered when not being used for solar viewing, for ventilation. I have no idea whether that is necessary or not. I've never noticed Celestron 8" SCTs having vent holes. By the way, the wrinkling of the solar material in the tube is natural...it is not supposed to be stretched tightly. The picture below of the sun was taken with this setup. Also, if you do make one of these solar filters like this, slip the tube on and off the telescope slowly...the tight fit causes a suction and could tear the solar material.
    ETX Finder ring.jpgETX front.jpgSunspots ETX Oct_14.jpg

  7. #77
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    Default Re: Anybody mod their Etx?

    Hi, I have an ETX-80 and was looking into adding an electrical focus. Can you post some pics of your scope after the mod? Any drilling involved?

 

 
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