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  1. #1
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    Default Which SCT focuser is good? Feathertouch or Williams Optics DDG?



    Can anyone help me decide which focuser is best overal performance and quality for my Celestron C8 with gray tube? I will be doing a lot of astrophotography. I heard from many backyard astronomers about the imageshifting and other related issues that cause not-so-great image.

    The two focusers I have looked at are:

    1) Starlight Instruments Feathertouch SCT MicroFocuser - Celestron C8

    2) William Optics 2" DDG SCT Focuser


    If you think this is overkill, suggestion are welcome. It seems to be the best cost is in the william one but I may be wrong.

    Thanks.

  2. #2
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    Both are good, but the "gold" standard is the Feathertouch. You would not be disappointed with either one.
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  3. #3
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    Default

    Thanks Joe.

    I heard around online forums that the Feathertouch microfocuser still gives you image shift. And the Williams crayford focuser extend out from the SCT rear cell may give me more power than I want for a particular eyepiece. Don't know if these are true.

  4. #4
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    Default

    The image shift issues is a real pain and a huge reason to go with a Meade (has primary mirror lock) or the EdgeHD(has primary mirror lock). At issue it that the focus in these is achieved by moving the primary mirror, if you can't get it close and lock it (then focus outside the exit baffle for fine tune) - as the mount moves the primary position will shift, more severe at some angles than others and also depending on exposure length. So if you can't lock the mirror - for visual this isn't so bad - but for imaging it's a show stopper.

    I had the FT focuser in my C11 (On a GEM mount) - did nothing to stop it. My recommendation is get an SCt with a primary mirror lock like the Meade or EdgeHD and take it from there. Depending... Celestron still hasn't released a focal reducer for the HD and from what I've read, they may need one for each different scope?

    These are fantastic scopes for visual but for imaging I'd look for a different OTA.

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    I ended up buying the William Optics SCT focuser.

    Thanks guys.

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    Default Re: Which SCT focuser is good? Feathertouch or Williams Optics DDG?

    Bought a Celestron Nexstar Evolution 9.25. So your saying that unless you have a primary mirror lock to the scope we are screwed in taking short 30 second photos with a Feathertouch or a crayford type focuser that as the mount moves the primary mirror will shift causing blurred pictures. Yes, no, maybe. So spending money on a good feathertouch or crayford focuser is a waste of time and money( was thinking of buying a moonlight SCT focuser that accepts a F6.3 reducer corrector internally.

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    Default Re: Which SCT focuser is good? Feathertouch or Williams Optics DDG?

    I use a feathertouch with my 11" edge and find it to be excellent ! You do still get a little image shift thought. When I'm imaging Jupiter I use a 2.5x Barlow at f25 and the fine tuning focuser on the feathertouch gives little image shift
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