Meade LX50 Manual de instrucciones descargar pdf (Pagina 3)

comments concerning the 7" crudely inserted into strategic places. The 7" is sufficiently different that it really

needs its own manual. Omissions abound. For instance, there is no mention of the tube ventilation fan and its

proper cabling or use and a dimensioned optical system diagram shows only the SCT models. A number of

operational questions are not covered at all in the manual. Some of these common questions are listed later

on. (If any other users have answers, please let me know.)

The second design problem is caused by the use of the basic 8" SCT fork assembly with the longer tube of

the 7" Mak. The telescope's tube is not able to swing through the fork arms. This limits the lowest elevation

you can reach in the southern sky. At my latitude (30 deg.) only about 15 deg. of the southern horizon is

unreachable. This is not a big problem for me but others at even lower latitudes should beware of the

limitations and consider an LX-200 version of the Mak in alt-az mode. The biggest problem this causes for

me is one of storage size and portability. The 7" Mak must be stored with the eyepiece end between the fork

arms rather than the corrector end. This means that the overall length of the stored instrument is nearly the

same as my 10". So much for improved portability (one of my considerations for purchase.) Another

mechanical interference problem is that the power cords for the various accessories can interfere with

operation very near the east or west horizons due to the closeness of the fork arms. This problem could be

easily eliminated if Meade used right angle connectors for the plugs that attach to the control panel of the drive

base.

One feature which Meade should consider adding to future versions is a switch on the auxiliary power outlet

of the control panel. They caution the user to never "hot plug" the accessories that attach to the front panel.

This becomes an inconvenience for the tube fan and would also apply to a CCD. You must turn power off,

plug/unplug the accessory, then turn power back on. A simple switch on the AUX output could alleviate this

inconvenient procedure.

In order to reduce overall costs (I suppose), Meade no longer supplies a hard packing case with the

instrument. It does come in a rather sturdy, well padded cardboard box which doubles for storage, but I will

eventually invest in a more durable storage container to better protect the scope. I'm afraid the cardboard

wouldn't last long being routinely transported for observing.

The final design feature which I don't like at all is the leg spreader lock mechanism on the new field tripod.

In order to collapse the tripod legs for easy transport, the wedge assembly must be completely removed also.

The older field tripod supplied with my LX-3 had no such restrictions. The tripod has obviously been changed

to accommodate the mounting of LX-200's in alt-az mode to the detriment of wedge users. Fortunately, in

comparing my old tripod to the new, I see that I can make some easy modifications

to gain back the

convenience that has been lost. (I find it easier to leave the wedge attached to the tripod at all times.)

Some features of the design give me an uneasy feeling for the future. The most worrisome of these is the

attachment of the secondary baffle to the corrector plate. In the photographs of the product I have seen, the

secondary baffle is not even visible. You generally see only the aluminized spot on the corrector. On my unit

there is a substantial baffle surrounding the secondary spot. It is glued to the corrector. Being a worrier, I

wonder about the long term strength of that glue bond and whether at some point years down the road it will

fail, dropping the baffle onto the primary mirror. The baffle does its job very well, though, I must admit.

Contrast is excellent even relatively near a bright object. (More on that later.) The second minor worry is that

I can detect some image shift while focusing. While this is to be expected in a primary focused design, I worry

that I can detect any at all in the new 7" while my 9 year old 10" is just now showing the first signs of it. The

shift was noticed at high power (445x) and amounted to about 30" of arc. I'm not into CCDs so I don't know

if this amount of shift would be a problem but it isn't too bad for my visual use. The last worry is that I also

noticed some backlash in the R.A. drive when playing with the control pad. I didn't actually try to measure it,

but I would "guesstimate" that it was on the order of a minute or two of arc. I will try to take a closer look at

this during my next checkout outing. For now, I have no idea if this is excessive or not. My LX-3 drive

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Meade 7" LX-50 Maksutov Review

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Meade 7" LX-50 Maksutov 1

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Meade LX50 Manual de instrucciones Pagina 3

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