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Thread: SW Rotating Focuser?

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    Default SW Rotating Focuser?





    I’m considering replacing the stock focuser on my ED80 with a Sky-Watcher rotating focuser. Has anyone done this on an ED80? I make the stock focuser (without adapter) 12 centimetres (120mm) long.

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    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: SW Rotating Focuser?

    I'm not sure of the fit on an 80, but I do have one on the ST150 & ST102, plus an SCT crayford version on the back of the Mak. I like them better than the GSO versions I was more familiar with. The one drawback I've found is that they only have one dovetail base mounting position. Usually not an issue unless you need to mount two finders etc.

    Edit to add: I'm fairly certain the refractor models are 96.6mm collar.
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    Default Re: SW Rotating Focuser?

    Quote Originally Posted by SpyderwerX View Post
    I'm not sure of the fit on an 80, but I do have one on the ST150 & ST102, plus an SCT crayford version on the back of the Mak. I like them better than the GSO versions I was more familiar with. The one drawback I've found is that they only have one dovetail base mounting position. Usually not an issue unless you need to mount two finders etc.

    Edit to add: I'm fairly certain the refractor models are 96.6mm collar.
    OK thanks. I've made some enquiries and these should more or less be plug'n'play with the ED80 Evostar. I can't get any info on the length of the SW focuser. I've heard the rotation is smoother than the GSO equivalents. The older models had no screw holes for a finder shoe, but the new focusers do. I only really need one shoe anyway. My main concern is the overall length of the replacement focuser. If it's 12 cm I shouldn't have any focusing problems and the modified OTA should fit in its carry case. The latter is fairly important for me as it greatly helps in transporting the scope outside.
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    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: SW Rotating Focuser?

    On mine: From the rear contact point of the scope tube is approximately 117mm to the rear of the 2" focuser tube, not including the 1.25 adapter. It has 60mm of focus tube travel.
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    Default Re: SW Rotating Focuser?

    Also, from all the descriptions and applications I've seen, it looks as they are from 100mm plus OTA's. So it may pay to really double check with them concerning the 80 application, because the ones I have would definitely not fit an 80.
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    Default Re: SW Rotating Focuser?

    Quote Originally Posted by SpyderwerX View Post
    Also, from all the descriptions and applications I've seen, it looks as they are from 100mm plus OTA's. So it may pay to really double check with them concerning the 80 application, because the ones I have would definitely not fit an 80.
    Yeah, that's a good point. Thing is, the ED80 has a 100mm OTA, honestly it's huge for an 80mm doublet and could almost pass for a 100mm scope. Apparently, the collar for the ED80 is identical in size to an ST102. I've been looking at some stupid expensive rotating focusers as well. I've been experimenting with the ED80 and I think I'll be OK with the stock focuser and a Baader adapter and stick with 1.25" eyepieces. It's already well collimated and the stock focuser is dual speed and pretty smooth. I've got some nice 1.25" diagonals.



    These will be fine in an f/7.5 scope and will give me 4mm, 3.2mm and 2mm exit pupils for deep sky and I've got some nice Plossls and ortho's for lunar/planetary.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

 

 

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