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Thread: Meade DS2090at

  1. #1
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    Question Meade DS2090at



    Hi all,
    New here.
    I believe (from a Google Search result the other day, which I can't seem to find now), that there may be a thread somewhere here regarding modifying the DS2090at.
    From memory it involved changing the focuser to a metal, more robust, finer control version?

    For info, I'm an amateur photographer, and have been interested for a while in trying astro photography.
    My budget is non existent (amputee and work part time self employed as an engineer), so anything I do is always a project, I bought the scope with various electronic faults which I've repaired, and I've also given it Bluetooth capability so I can control it from my tablet.
    I'd quite like to give it electronic remote focus also, as sitting outside on a cold night can be rather unpleasant as an amputee.
    I can operate and liveview from my DSLR over Wi-Fi.

    I suppose what I'm looking for in a replacement focusser is strength, fine adjustment, and remote capability.
    I will also likely replace the prism for a metal one in time.

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    sxinias's Avatar
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    Default Re: Meade DS2090at

    The DS2090AT is a nice telescope for the casual viewer or beginner. Several years ago a member replaced the focuser and wrote a good description. He also opened up the front lens cell in order to blacken interior surfaces.

    The focuser on the DS2090AT is definitely a weak link for astrophotography. It is made of plastic with some parts having a metalized finish. Given the construction of the mount, tripod, and focuser it is almost impossible to focus without inadvertantly moving the scope even if you hold the scope in one hand and try to focus with the other. A drastic improvement can be attained simply by removing all the thick grease from the focuser. It works much better running dry than it does with the factory grease job.

    Unlike telescopes like the ST80, replacing the focuser is not easily done. To save cost Meade glued most of the telescope together. If I remember correctly the ID of the telescope tube is not typical of most available focusers.

    I once tried to photograph DSOs with my DC2090AT as part of a project I was doing exploring the ability of low end, entry level GOTO mounts for astrophotography. There were several issues that are not easily addressed. One is the long tube length on a wiggely mount. One end of the tube has the lens cell; the other has a relatively heavy DSLR. Torsional vibration is abig problem. Also the mount is not of a rugged design and I didn't feel comfortable with its ability to support the load the weight of my camera.

    For probably less money than a replacement focuser you can buy a used Orion ST80A with a fast focal ratio that, if tuned up, has an acceptable metal focuser with "T" threads for a camers. You can replace the clamshell scope holder with a home made "L bracket" Your 90mm refractor remains a nice scope to use for solar system observation and for many DSOs.
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    Mount;

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    ST-80A 80mm Refractor (OTA); Meade
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    203mm SCT (OTA);
    Meade DS2090AT 90mm Refractor; Meade 2045LX3 102mm SCT;

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    Default Re: Meade DS2090at

    Thanks for responding, the weight of my DSLR is pretty minimal as I'm using my Nikon d3300, which is quite light in comparison to my d7100...

    Good shout with the grease, I've no idea why they thought it was required or necessary for a mechanism that's not exactly hard working.

    Unfortunately due to wife constraints lol, I'll have to stick to this scope for the time being.
    Bit sure if you'll a link to the thread where the guy modded his, as my post count is too low, so can't see links, but it sounds like this was the one I saw mentioned in a Google post.
    I quite happily strip and rebuild camera lenses, so I've no fear of stripping the scope down to mod it.

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    Default Re: Meade DS2090at

    A lot of people change out the stock focuser for a GSO crayford which is much more robust.
    https://agenaastro.com/parts-accesso.../focusers.html
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
    Mounts: Manfrotto 028B/ 055PRO, Celestron SLT, Celestron CG-5/ Argo Navis, Stellarvue M2C, Vixen SXP Binoculars: Celestron Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the
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    / camera. - Gabrielle

    Ya gotta keep this Apo/
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    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind.

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    Default Re: Meade DS2090at

    Thanks Gabby, I'll take a look.

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    Default Re: Meade DS2090at

    I think that you will find that the weak point with this telescope is the actual mount.
    If you are looking at imaging then you may find it a bit frustrating to use.
    If you are just looking at something for viewing more you may want to look into EAA (Electronic Assisted Astronomy)
    Some of the members use this technique exclusively.

    One of our members, GX8ES102 does a lot of this. Maybe send him a private message to get some tips?

    http://www.astronomyforum.net/members/gx8es102.html
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
    Mounts: Manfrotto 028B/ 055PRO, Celestron SLT, Celestron CG-5/ Argo Navis, Stellarvue M2C, Vixen SXP Binoculars: Celestron Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the
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    / camera. - Gabrielle

    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind.

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