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Thread: Explore Scientific Coma Corrector

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    Default Explore Scientific Coma Corrector

    I just realized that I never gave a first light on the ES Coma Corrector that I bought back during Explore Scientific's "12 days of Christmas" sale. I had been interested in a coma corrector for a while but the cost made them a "would-be-nice" item. During the sale though, I managed to pick one up for $200.

    The typical issue for this particular coma corrector is back focus, as it adds a considerable amount. However, with the Celestron Sky-watcher 12" collapsible dob, it turned out not to be an issue. The Sky-Watcher has a 2" eyepiece adapter that moves the eyepiece out about 2-3". So I was able to just remove that adapter and put the ES Coma Corrector in it's place. I do have to pull the CC out a little bit as it's too much in-focus. Once I put it in place, I adjust it using my 18mm ES 82° eyepiece. It needs the most inward focus of all my eyepieces.

    The adjustment process is fairly simple. Put the eyepiece requiring the most inward focus into the CC and bring it to focus. If there is any coma, twist the top out a few turns and refocus. Keep doing that until you get a clear field. Once you have that set, lock the focuser. Any eyepiece you put into the CC afterwards gets focused using the turnable top. It makes it work like a fine helical focuser.

    Now I get a nice clean field of view, though it wasn't really that bad to begin with. I also like using the tunable top as a focuser. It's a much finer adjustment than the single speed Crayford focuser. It makes it real easy to sneak up on perfect focus.

    Another nice thing, all my 2" ES eyepieces are nearly parfocal (24mm 82°, 18mm 82°, 9mm 100° & 5.5mm 100°). It's just a few twists between each eyepiece to bring it in to a perfect focus.
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    Telescopes: Celestron 130SLT, Orion Skyview Pro 8", Skywatcher 12" Goto Dob. Orion ED80T CF
    Mount: AVX
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    Default Re: Explore Scientific Coma Corrector

    Nice first light report :-) I find my ES 20mm 100° and ES 30mm 82° are almost different eyepieces with a coma corrector (notice we have similar scopes). The stars are so much better corrected towards the edge, which isn't necessarily where I look so much but where my peripheral vision and averted vision can work to pick out things. Also use it on my 13mm 100° but not really below that (I have all 70°/72° AFoV eyepieces down there). Clear skies
    Robrj likes this.
    Scopes:Skywatcher f5 12" Dob, f4 8” Quattro, ED80, ED100, Saxon f5 8" Newt
    Mounts:Skywatcher EQ6-R, HEQ5 Pro (EQMod), AZ4
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    Apps:Nebulosity, PHD2, Sequence Generator Pro, Voyager (Starkeeper), PixInsight
    Eyepieces:Explore Scientific, Pentax XW, TeleVue Panoptic, Delos, Nagler Zoom, Ethos, LVW, BCO

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