Meade 4500 Maintenance Cleaning, Mount and Tripod Adjustments, Correct collimation

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H.Maintenance

1. Cleaning

As with any quality instrument, lens or mirror surfaces should be cleaned as infrequently as possible. Front surface aluminized mirrors, in particular, should be cleaned only when absolutely necessary. In all cases avoid touching any mirror surface. A little dust on the surface of a mirror or lens causes negligible loss of performance and should not be considered reason to clean the surface. When lens or mirror cleaning does become necessary, use a camel’s hair brush or compressed air gently to remove dust. If the telescope’s dust cover is replaced after each observing session, cleaning of the optics will rarely be required.

2. Mount and Tripod Adjustments

Every Meade Model 4500 equatorial mount and tripod is factory inspected for proper fit and function prior to shipment. It is unlikely that you will need to adjust, or tighten these parts after receipt of the telescope. However, if the instrument received unusually rough handling in shipment, it is possible that some of these assemblies can be loose. To make adjustments you will need a 1/2" or 11/16" socket or adjustable end wrench, a 5/64" hex wrench, and a Phillips-head screwdriver.

The equatorial mount has four main areas that can be adjusted: A loose polar shaft can be tightened by releasing a 5/64" hex set-screw that is on the side of the 11/16" polar shaft acorn cap nut (32), and then turning the 11/16" acorn cap nut clockwise to a firm feel, and then tightening the 5/64" hex set-screw. A loose Azimuth base (33), can be tightened by turning the 11/16" Azimuth shaft bolt (34), located underneath the mount and in between the three tripod legs, clockwise to a firm feel. The R.A. (35), and Dec. (36) worm block assemblies can have backlash removed by releasing the 2 Phillips-head screws on each assembly, applying pressure to the worm block against the worm gear, and then tightening the Phillips-head screws. Note that overtightening of any of the nuts, bolts, or screws can inhibit the smooth rotating action of the axes and gears, and may result in stripping the threads.

The tripod legs have 1/2" nuts (39), and Phillips-head screws (38) that may have backed off, may also be tightened to a firm feel for the most sturdy performance of the telescope.

Diagonal

Diagonal Mirror

Primary Mirror

Assembly

 

 

 

 

Primary Mirror-Tilt

 

Focused Image

Screws

 

 

 

Fig. 4: The Newtonian Reflecting Telescope

3. Collimation (Alignment) of the Optics

All Meade Model 4500 telescopes are optically aligned at the factory prior to shipment. It is unlikely that you will need to align, or collimate, the optics after receipt of the instrument. However, if the telescope received unusually rough handling in shipment, it is possible that the optics must be re-aligned for best optical performance. In any case this alignment procedure is simple, and requires only a few minutes the very first time the telescope is used. Take the time to familiarize yourself with the following collimation procedure, so that you will recognize a properly collimated instrument and can adjust the collimation yourself, if necessary.

a. Correct collimation

The properly collimated (aligned) mirror system in the Model 4500 assures the sharpest images possible. This occurs when the primary mirror and diagonal mirror are tilted so that the focused image (see Fig. 4)

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Contents Model 4500 4.5 Equatorial Reflecting Telescope Meade Limited Warranty Table of Contents Key to Fig Meade Model 4500 4.5 Equatorial Reflecting Telescope Unpacking and Assembly Introducing the Meade ModelThis Manual Standard EquipmentBalancing the Telescope Alignment of the ViewfinderUnderstanding Celestial Movements and Coordinates Celestial SphereUsing the Telescope Lining Up with the Celestial PolePage Using Setting Circles Calculating PowerMaintenance Cleaning Mount and Tripod AdjustmentsCollimation Alignment of the Optics Correct collimationDiagonal Assembly Spider vane adjustments Diagonal holder adjustmentsPrimary mirror adjustments Star testing the collimationSpecifications Model Optional AccessoriesMeade Instruments Corporation

4500 specifications

The Meade 4500 is a notable telescope in the world of amateur astronomy, designed to make stargazing accessible and rewarding for both novice and experienced observers. This telescope belongs to the category of Newtonian reflectors, known for their simple design, impressive optics, and affordability. At its core, the Meade 4500 features a 4.5-inch (114 mm) aperture, which enables users to capture bright images of celestial objects and a variety of deep-sky phenomena.

One of the main features of the Meade 4500 is its advanced optics system. The primary mirror is parabolic, ensuring optimal light collection efficiency and delivering crisp images free from spherical aberration. The telescope's focal length is 900 mm, providing a versatile viewing experience with a moderate focal ratio that balances wide-field and high-magnification observations. Coupled with a 1.25-inch focuser, the telescope accommodates a range of eyepieces, allowing users to customize magnification for various celestial targets.

The Meade 4500 is equipped with a sturdy and stable mount, crucial for precise tracking and steady views. The telescope employs an adjustable, manual altitude-azimuth mount, which provides smooth movement in both vertical and horizontal directions. This mount is particularly beneficial when observing planets, the Moon, or any other celestial object that demands meticulous positioning. The lightweight design of the telescope further enhances portability, making it easy to transport for observations in different locations.

Another key characteristic of the Meade 4500 is its user-friendly setup. The telescope usually comes with an instructional manual, guiding users through the assembly and initial alignment process. The setup typically requires only basic tools, allowing beginner astronomers to quickly get started. Additionally, Meade often provides a selection of accessories with the telescope, such as star charts or a red dot finder, which enhances the overall experience.

In terms of technology, the Meade 4500 embodies the principles of optical design and ergonomics. The telescope’s structure allows for easy tracking of celestial movements, and its reflectivity ensures bright views of both bright planets and distant star clusters. Whether you're examining the rings of Saturn or exploring the lunar surface's fine details, the Meade 4500 stands out as an excellent gateway into the universe, combining optical performance with user-oriented features perfect for every stargazing enthusiast.
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