Question about Meade LXD55 AR5EC Achromatic 5 in f9 Refracting Telescope 05095503

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LXD75 AR6-AT I have a problem with the doublet lens. I seem to be able to collimate it, but there is still light that spreads out from stars and planets that are brite. Also when I'm handling the scope to place it on the mount I hear a clunking sound from the objective lens. I think the secondary part of the doublet is loose. I see the concentric rings when I attempt to collimate the scope but the blob of light that forms when you defocus the scope, forms beside the star and not on top (as I would expect). If the corrector lens is loose an slumping down from it's correct tightened spot would this cause the image to spray light from where it's meant to? Can I repair this or should I return the scope to Meade?

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I have the identical issue --- AND It did not have it when it was new. I was returning from a road trip, and heard the rattling cell get louder and louder in the back seat. When I got home, the retaining ring that keeps the doublet in the cell had almost fallen out. I GENTLY checked for lens damage and noticed that one of the three tiny foil spacers between the lenses had fallen out and was missing. I tried to fabricate one out of aluminum foil, but upon reassembly, I have symptoms identical to the ones you describe. No matter what I've tried, I still have the same symptoms. I'm getting close to giving up and sending the cell to Meade to service. I suspect the issue is that the dimension of the tiny spacers and when one falls out or is replaced with the wrong size, we get the symptoms.

Posted on Apr 30, 2013

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This is an old problem but I will answer it--

The rattling sound is a KNOWN ISSUE with these scopes. It actually does not affect anything. The scope is what is called an acromatic refractor. ALL ACROMATIC REFRACTORS show color fringing around bright objects. You would need to buy an APOCROMATIC refractor with 3 lenses to get true color correction. These scopes are very expensive to buy.

You can also use a "minus violet" filter to eliminate most of the color fringing in that scope. If the scope cannot be collimated it should be returned to Meade.



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Posted on Aug 02, 2011

  • jbondojbondo Jul 29, 2014

    It's absolutely true, rattle is normal and fine up to a point. My unit's retainer ring became so loose, the outer element was flopping around with a big 'clack' (like 1 entire inch flapping back and forth.) Anyhow. Finally found the solution to the blue tinge issue. I bought some lab-grade 99.99 pure alcohol and recleaned the elements, and presto, the blue tinge problem was gone.

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