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  1. #1
    icetek's Avatar
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    Default Peterson EZ Focus kit



    Hi,

    I've been reading some things about my new scope (8" LX90-ACF GPS) and one item of interest is the Peterson EZ Focus kit. I've had the scope all of 3-4 weeks now so am still getting used to it and am waiting on the autostar-PC cable (military mail issues!!! - hope to see that in tomorrows mail finally!!!). I've had the scope out a few times and battling the austostar issues, dew issues, etc... I have been able to 'see' some things but nothing stellar (?!?!?) yet. But I do notice that the stock focus knob just seems lacking. Maybe it's my neewbie-ness but things are in focus and then a slight nudge and then things are not. A few times it was dew but I've addressed that with an Astrozap dew shield w/ heater (BIG recommendation for that!!!) - and I just ordered more heaters for the finder and EP. So now back to focus.

    For $30+SH is this a worthwhile upgrade to the stock focuser on a new LX90? Did by some chance Meade make any improvements with the newer scopes (my autostar software was old - v43ef- so not really sure how 'new' my scope is). For the price compared to the other things I've bought it is not much but wanted to know if I needed it for the finer focus adjustments...

    thanks for any inputs.
    Mike
    Meade 8" LX90-ACF w/ GPS/LNT. Broke drives on an ETX-90 closet space taker-upper

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  2. #2
    rexajo's Avatar
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    Default

    ...to your dew heating issue, did you try use hair dryer to keep telescope dew shield a little above dew temperature? I use it when I see dew on my telescope shield. Frequency depends on outdoor humidity and temperature. This approach is much more cheaper than ASTROZAP.

    ... to your focuser issue, Meade knob focuser is not appropriate for precise focusing. Reason> when you take knob, telescope begins to shake... For precise focusing without telescope shaking you need focuser with remote control mounted on rear site of telescope, e.g. JMI focuser.

    regards
    Jozef

  3. #3
    DaltonSkyGazer's Avatar
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    Default

    I use the Peterson focuser kit on my LX-2oo for me worthwhile investment just very smooth, and easy installation had it for years, highly recommend. All my final corrections are done with the meade electric focuser, but the upgrade is worthwhile. The bucks gears upgrade is must have if you want to image.

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    12" LX-200 GPS w UltraWedge, 800 HD OTA, CGEM, 80mm Meade APO,
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  4. #4
    icetek's Avatar
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    Default

    A hair dryer is alays a possibility but my clear area is about 100 feet from my back porch and the nearest power socket so I would have to run another power cord extension. Always a possibility provided I could find that long unused hair dryer - still have it somewhere but no longer have much of the hair that initially required it...?!?!?!

    Looking at the electronic focusers out there - Meade no longer carries one for the LX90??? - they are a bit too pricey for me at this point. Also the JMI's look to be mounted on the backplate and not on the current focus knob. Is this right? I did not see a model that would fit on or replace the current knob. Anyway any serious astroimagery is long off for me until I get further into this hobby and more proficient/smarter. So I guess I'll try the peterson mod first and see what I get.
    Thanks
    Mike
    Meade 8" LX90-ACF w/ GPS/LNT. Broke drives on an ETX-90 closet space taker-upper

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  5. #5
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    Default

    Hi
    When I got my lx90 I found the focusser was a little loose - and touching the knob produced jarring.
    The knob also seemed a little loose to me and I could wobble it about and affect the alignment of the mirror inside on which it operates.
    There's a tiny allen screw on the knob which has a key included in your kit. Loosen this and you can tighten the focusser knob to reduce the clearance between the knob and the back plate, tighten the allen screw when you find a good 'feel' and all should be well

 

 

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