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LXD650 and large telescopes

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#1 AlienRatDog

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Posted 27 July 2009 - 08:00 PM

WOuld it be safe to put a Meade 152ED on a LXD650 mount? Just curious...

#2 Fish

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Posted 27 July 2009 - 08:12 PM

Abe,

I've had an AR-6 (about 26 lbs) on an LXD650 and saw no real problems. I discovered it got a bit shaky for AP with not much more than that although for visual use is was fine.

The scopes originally supplied with this mount weighed about 14 lbs (102ED) and 16 lbs (127ED) so neither taxed the mount at all.

The mount in the avatar is an LXD750 and works at about 40 lbs wonderfully. In my case as yours be sure to balance the mass carefully to prevent motor stall.

I hope that helps.

Regards, Marc

#3 jrcrilly

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Posted 27 July 2009 - 08:12 PM

WOuld it be safe to put a Meade 152ED on a LXD650 mount? Just curious...


It'd be safe (the mount wouldn't collapse under the load) but the 152ED is long and heavy for a 6" refractor and I don't believe it would be very stable.

#4 GShaffer

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Posted 27 July 2009 - 09:17 PM

I have a LXD650 and with my 6" AR6 f/8 on it which is very similar to the 152ED both in weight and size it is fine for visual......you might be asking a bit much of it for imaging I suspect.

#5 AlienRatDog

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Posted 27 July 2009 - 09:51 PM

Oh I am purely visual...

#6 GShaffer

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Posted 27 July 2009 - 10:45 PM

Then it should be fine based on my experience. It works fine for both my AR6 and my C11.....for visual I believe it would be good with upto about 35-40 lbs with no problems. I would compare it to an Atlas load wise.

Oh I am purely visual...



#7 Eddgie

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Posted 28 July 2009 - 09:32 AM

I have not owned the LXD650, but I did own a Meade 152ED which I had on an Atlas. At the time, I wrote a review on the Atlas and said that it was "Acceptable" with the Meade, but later I changed my opinion. I really became less accepting over time becase of the long vibrations.

I think the LXD650 is just too small for a Meade 152ED.

The Meade is f/9, and is considerably heavier than the 6" F/8 achromats others are talking about. The ED lens elements are thick and heavy, and the cell is much bigger and heavier. The focuser is also much heavier than the 6" f/8 achromats.

The 6" Achromats tend to use 6" tubes. The Meade 152ED is in a 7 inch tube. And of course it is longer.

The problem will be when you are trying to view at higher angles. The mount will have to be used with the legs fully extended to give you ground clearence at the eyepice. I had to use my observing chair lowered quite low even with the Atlas and the Meade 152. And with the legs fully exteneded, the Atlas got VERY wobbly.

I personallly think that if you use this scope at high powers (and they CAN be used at very high powers quite well) you will find that every time you focus, you will have difficulty because the mount will shake.

I have a Meade LXD750 that I have my 6" f/8 AP on. It is very similar in weight to the Meade, and it is a HUGE step up over the Atlas. I can focus at 250x with almost no movement of the OTA. It is rock solid.

Meade picked the LXD750 for the 152ED for good reason. It is a big telescope that is tough on the mount.

You might be able to make it work on an LXD650, but I personally don't think you will make it work well. I would recommend a G11, CGE, or Ci 700. I would not even recommend the Atlas anymore. I eventually sold the Atlas (and the Meade) and when I got the AP, I bit the bullet and bought an LXD 750. And even here, after side by side comparison, I think the LXD750 is better even than the CGE.

My advice? Don't do it unless you HAVE to. The Meade 152ED was a WONDERFUL scope, and it would be sad to see it undermounted.

#8 AlienRatDog

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Posted 28 July 2009 - 12:40 PM

Actually, I am think I am going to stick with a 127ED to put on it...






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