Stimmen - 3, Durchschnittliche Bewertung: 3.3
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Anleitung Zusammenfassung
Images may appear blurred or distorted due to temperature differences between inside and outside air. Also, it is a good idea to allow your telescope to reach the ambient (surrounding) outside temperature before starting an observing session. 7. Planets and other objects viewed low on the horizon often lack sharpness — the same object, when observed higher in the sky, will appear sharper and have greater contrast. Turbulent air in the atmosphere can cause images to “shimmer” in the eyepiece. Try reducing power (change your eyepiece) until the image steadies. Keep in mind that a bright, clear, but smaller image is more interesting than a larger, dimmer, fuzzy one. 8. Astronomical software or a good star atlas will assist you in locating many interesting celestial objects. These objects include: • The Moon, covered with craters, mountain ranges, and fault lines. The Moon is best observed during its crescent or half phase when Sunlight strikes the Moon’s surface at an angle. It casts shadows and adds a sense of depth to the view. No shadows are seen during a full Moon, causing the bright Moon to appear flat and uninteresting. • Cloud belts across the surface of the planet Jupiter. • The 4 major moons of Jupiter, visible around the planet, changing position each night. • Saturn and its famous ring system. • Deep-Space: Nebulae, galaxies, multiple star systems, star clusters — hundreds of such objects are visible through your Polaris telescope. If possible, observe under a dark sky, away from city lights—you will be able to observe more deep-space objects through your Polaris telescope. • Terrestrial objects: Your Polaris telescope may also be used for high-resolution land viewing. Important Note: Using the diagonal mirror results in an image which is reversed left-for-right, but which is correctly oriented up-and-down. Terrestrial observations should almost always be made using the 25mm low-power eyepiece for bright, sharp images. Observing horizontally through the Earth's atmosphere distorts images in higher-power eyepieces (such as 12.5mm). CALCULATING POWER The power (magnification) at which a telescope is operating is calculated by dividing the focal length of the telescope by the focal length of the eyepiece. The focal length of the 60-AZ-D telescope is identified on the focuser label as being 700mm (F = 700mm). The focal length of the eyepiece is usually identified on the top of the eyepiece barrel. – 7– For example, if you are using a 25mm eyepiece, the resulting power will be: Power = 700mm . 25mm = 28X. For example, if you are using a 12.5mm eyepiece, the resulting power will be: Power = 700mm . 12.5mm = 56X. The purpose of a Barlow lens is to increase the magnification possible with a given eyepiece. The 3x Barlow supplied with this telescope will triple the normal eyepiece power. For example, the 25mm (28X) eyepiece, when used in conjunction with the 3x Barlow lens, yields 84X. The 12.5mm (56X) eyepiece yields 168X when used with the 3x Barlow lens. To use the 3x Barlow lens, remove the diagonal mirror (13, Fig. 1) from the focuser drawtube (15, Fig. 1). Then insert the 3x Barlow lens, followed by the diagonal mirror (13, Fig. 1) and finally the 25mm eyepiece (1, Fig. 1). Refocus until the image is sharp. POWER AND EYEPIECES The useful higher magnification with any 60mm diameter telescope is in the range of 80 to 120 power. The general rule to follow with any telescope, regarding power: Only use as much magnification as a steady, well-defined image supports. The stability of the air varies and is one reason why having various eyepieces is desirable. Higher powers are no guaranty of better images; in fact, the opposite is often true. MAINTENANCE As with any quality optical instrument, lens surfaces should be cleaned as infrequently as possible. A little dust on the surface of the objective lens (14, Fig. 1) causes negligible degradation of image quality and should not be considered reason to clean the lens. When lens cleaning does become necessary, use a camel hair brush or compressed air to gently remove dust. Wipe only with a soft, clean cloth, applying as little pressure as possible to avoid scratching glass surfaces. Note: Gently pull off and remove the the dew shield/lens shade (21, Fig. 1) to access the objective lens (14, Fig. 1). SPECIFICATIONS Objective (main) lens focal length . . . . . . . . . . .700mm Objective lens diameter . . . . . . . . . . . . . . . . . .60mm (2.4") Focal ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . .f/11.7 Mounting type . . . . . . . . . . . . . . . . . . . . . . . . . .Altazimuth OPTIONAL ACCESSORIES #927 45° Erect-Image Roof Prism (0.965 O.D.): Correctly orients the telescopic image during terrestrial observing and yields an image position at a 45° angle to the main telescope tube, resulting in a more comfortable observing position in most cases. Additional Eyepieces (0.965"): Meade recommends the following eyepieces for enhanced astronomical and/or ...