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Mittag55
member


Reged: 10/31/08
Posts: 64
Loc: West Amboy, NY
LXD75 Proper dual mount new
      #3064045 - 04/24/09 10:15 AM

I have just ordered a new mount and plan for now using it for my 130 mm reflector and adding a 80 or 90 mm guide/imaging refractor on it...is there any proper physics or distribution of weights i should know about or can i just pair up the scope rings and balance the rig out.Any help or point to the right info would be helpfull.


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Jerry3672
Vendor - Quantum Astronomy Products


Reged: 01/20/08
Posts: 500
Loc: Lexington NC
Re: LXD75 Proper dual mount new [Re: Mittag55]
      #3064450 - 04/24/09 01:46 PM

The best tip for that LXD75 is to have your mount a little (East) heavy. The gears always should climb a bit. If you are balanced perfectly, then the backlash will allow the mount to bounce back and forth and you will have long stars.

I have my 90mm guide scope on top of my 10 inch SN reflector. I had to add a custom weight to the end of the shaft, but you won't have that issue with a 130mm scope.

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Meade LXD75-SN-8, SN-10, C11
DSI Pro
Canon XSi 450D unmod


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Edited by Jerry3672 (04/25/09 01:23 PM)


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Mittag55
member


Reged: 10/31/08
Posts: 64
Loc: West Amboy, NY
Re: LXD75 Proper dual mount new [Re: Jerry3672]
      #3064829 - 04/24/09 05:21 PM

Thanks for the input...West heavy it will be.

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EricJD
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Reged: 07/24/07
Posts: 2148
Loc: Chesapeake VA
Re: LXD75 Proper dual mount new [Re: Mittag55]
      #3064957 - 04/24/09 06:37 PM

Eh mate, don't you mean East heavy so that as it rotates it's always pressing against the gears? I always balance east heavy and get nice round stars at 6 minutes on my LXD75.

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jgraham
Postmaster


Reged: 12/02/04
Posts: 11575
Loc: Dayton, Ohio
Re: LXD75 Proper dual mount new [Re: EricJD]
      #3065275 - 04/24/09 10:42 PM Attachment (28 downloads)

The LXD75 should handle that easily. Mine carries an LXD75 SN6 with a 90mm MCT as a guide scope. I usually balance mine evenly on both axis, then shift a small counter weight to make it just a tad east-heavy so it climbs against the load. Also, while guiding I use either north-only or south-only on the dec.

My standard imaging kit...

Attachment

--------------------
-John

The best advice on imaging I've ever been given... don't forget to look!


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Jerry3672
Vendor - Quantum Astronomy Products


Reged: 01/20/08
Posts: 500
Loc: Lexington NC
Re: LXD75 Proper dual mount new [Re: jgraham]
      #3066246 - 04/25/09 12:55 PM

Opps- You are corerct- East heavy so the gears are climbing.

--------------------
Meade LXD75-SN-8, SN-10, C11
DSI Pro
Canon XSi 450D unmod


www.spike-a.com Bahtinov Style Focus Mask


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Jerry3672
Vendor - Quantum Astronomy Products


Reged: 01/20/08
Posts: 500
Loc: Lexington NC
Re: LXD75 Proper dual mount new [Re: Jerry3672]
      #3066248 - 04/25/09 12:56 PM

Take note of where John has his camera. I have seen his image before and use his Idea to keep the mass in the correct place. This is the best place for the camera

--------------------
Meade LXD75-SN-8, SN-10, C11
DSI Pro
Canon XSi 450D unmod


www.spike-a.com Bahtinov Style Focus Mask


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Mittag55
member


Reged: 10/31/08
Posts: 64
Loc: West Amboy, NY
Re: LXD75 Proper dual mount new [Re: Jerry3672]
      #3066843 - 04/25/09 07:08 PM

Thanks...this is why i read the posts...lots of neat tricks and tips to keep me out of trouble.

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Mittag55
member


Reged: 10/31/08
Posts: 64
Loc: West Amboy, NY
Re: LXD75 Proper dual mount [Re: Mittag55]
      #3075547 - 04/29/09 05:48 PM

Well i have a 105 mm Antares coming to go on my mount so all is well. i will try it balanced at first to see how smooth the mount is and ofset East if it needs sit...Thanks all for the help

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