Meade LX50 Manual de instrucciones descargar pdf (Pagina 5)

Surprisingly, at low to medium power (90x - 215x) the fan's vibration was barely noticeable. For deep sky

observing, you could leave the fan running, but then you don't normally need it at lower powers anyway. All in

all, though, the fan is a very useful feature of this scope. I like it a lot! While the air was still too turbulent to

fully evaluate the optics with a star test, they looked pretty good. A slight difference in the inside/outside focus

images may tend to indicate some spherical aberration but I didn't attempt to isolate it to the scope or

eyepiece since the turbulence made the differences difficult to see well. I have not yet attempted a

"star-Foucault" or "star-Ronchi" test on the scope. I will try these at my next opportunity. (I don't know if

there is a better term for these tests, but they consist of replacing the eyepiece with a homemade knife edge or

Ronchi grating mounted in a 1.25" holder to be placed at focus. I then look at a northern star and use the

slow motion controls to cut into the focus beam as in a null test. This seems to best show the signs of any

zones in the optics.)

As mentioned above, the scope's baffling seems to be very effective. Other than sky glow from the 85%

illuminated moon, deep sky objects had very good contrast. Bright stars like Sirius and Betelgeuse were seen

to pop into and out of the field using the hand controller for slewing without a lot of glow preceding their

entrance into the field of view.

One point that greatly impressed me was the scope's ability to deliver very good images even at high

power. I was able to use an older 6mm Orthoscopic eyepiece giving 445x and get remarkably clean, crisp,

detailed images of the moon. This was a big surprise given the seeing conditions and was something that is

quite rare with my 10" SCT. On nights of very steady seeing, I expect planetary images to be spectacular.

Approaching full moon and a stretch of cloudy weather this next week will prevent a more detailed test of

the optics, but at this point I am very pleased and optimistic that my new scope is going to prove to be quite

good. Is it perfect? No. Is it just the right scope given my initial requirements? No. Will I keep it? You

better believe it! I would have liked a smaller physical package; it's not as light as I would have liked (though

it is very noticeably lighter and easier to set up than my 10"); not all accessories are available yet (Magellan II);

it suffers from some mechanical limitations that are outweighed in my own use by an otherwise strong feature

list; and it should give me many years of viewing pleasure. All in all, I think the Meade LX-50 7" Maksutov is

a worthwhile scope, especially for those interested in planetary (as I am) and double star observing.

[Subj] #264337-#Meade LX50 7" First Look

I had the scope out for a while last night in spite of the (nearly) full moon and rapidly increasing clouds. A

fellow club member came over to take a look at and through the scope. He brought his collection of Naglers

to evaluate the scope himself. (He is the owner whose C-8 leaped to its death on his home's tile entryway.

Nobody was home when it did this otherwise they would have tried to talk it out of its suicidal mood <grin>.)

The air was not quite as still as last weekend when I first tried the scope out. We did make some rather

"interesting" observations concerning the optics, though.

He carefully inspected the field of view's quality with several different eyepieces. We found that there is a

small amount of color visible at the very edge of the field. No coma was seen. The field seemed very flat with

good focus all the way to the edge. There did not seem to be any evidence of vignetting towards the edge.

The star test still seemed to show a small amount of spherical aberration as I had seen last weekend (under

correction -- it's interesting that one of yours showed the same). The most interesting part is that when he

tried his coma corrector, the images cleaned up and the spherical aberration visible in the star test cleaned up

completely. Neither of us could explain why the coma corrector seemed to correct this. The images were

much improved by its use, though. Have you ever heard of anything that would explain this? Could it be a

happy coincidence?

[Subj] #264469-Meade LX50 7" First Look

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Meade 7" LX-50 Maksutov Review

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