Meade LX200R Bedienerhandbuch PDF herunterladen (Seite 25)

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the image starts to become fuzzy as you work into higher

magnifications, then back down to a lower power (as when

the optometrist asks, “Is this lens better or worse?”). A bright,

clearly resolved but smaller image shows more detail than a

dimmer, poorly resolved larger image.

The characteristics of the human eye (particularly eye-pupil

diameter) and telescope optics impose minimum practical

powers. Generally, the lowest usable power is approximately

4X per inch of telescope aperture, or about 64X in the case of

the 16” telescope. In daytime, when your pupil is reduces to

avoid glare, the minimum practical power with the 16” LX200

increases to about 120X.

Avoid powers below this during daytime observations. A

reasonable magnification range for daytime terrestrial

observations through the 16” LX200 is from about 150X to

200X. The higher magnifications may not be practical during

atmospheric disturbances, such as those caused by heat,

moisture, and dust.

Accessories are available to increase and decrease the

operating eyepiece power of the telescope. See your Meade

dealer and the latest Meade Catalog for information on

accessories.

Apparent Field and Actual Field

Apparent Field, the field of view that your eye perceives

through an eyepiece, depends on eyepiece design.

Actual Field, your actual field of view, depends on the

eyepiece and the telescope. Calculate the Actual Field of a

telescope with a given eyepiece by dividing the Apparent

Field of the eyepiece by the power obtained using that

8”f/10 10”f/10 12”f/10 16”f/10

Eyepiece/Apparent Field Power/Actual Field Power/Actual Field Power/Actual Field Power/Actual Field

Super Plössl Eyepieces (5-elements; 1.25” O.D., except as noted)

6.4mm/52° 313/0.17° 391/0.13° 476/0.11° 635/0.08°

9.7mm/52° 206/0.25° 258/0.20° 314/0.17° 419/0.12°

12.4mm/52° 161/0.32° 202/0.26° 246/0.21° 328/0.16°

15mm/52° 133/0.39° 167/0.31° 203/0.26° 271/0.19°

20mm/52° 100/0.52° 125/0.42° 152/0.34° 203/0.26°

26mm/52° 77/0.68° 96/0.54° 117/0.44° 156/0.33°

32mm/52° 63/0.83° 78/0.67° 95/0.55° 127/0.41°

40mm/44° 50/0.88° 63/0.70° 76/0.53° 102/0.43°

56mm/52° (2" O.D.) 36/1.46° 45/1.16° 54/1.04° 73/0.71°

Super Wide Angle Eyepieces (6-elements; 1.25” O.D., except as noted)

13.8mm/67° 145/0.46° 181/0.37° 221/0.30° 294/0.23°

18mm/67° 111/0.60° 139/0.48° 169/0.40° 226/0.30°

24.5mm/67° 82/0.82° 102/0.66° 124/0.54° 166/0.40°

32mm/67° (2" O.D.) 63/1.07° 78/0.86° 95/0.71° 127/0.53°

40mm/67° (2" O.D.) 50/1.34° 63/1.07° 76/0.88° 102/0.66°

Ultra Wide Angle Eyepieces (8-elements; 1.25” O.D., except as noted)

4.7mm/84° 426/0.20° 532/0.16° 649/0.13° 865/0.10°

6.7mm/84° 299/0.28° 373/0.23° 455/0.18° 607/0.14°

8.8mm/84° (1.25” – 2” O.D.) 227/0.37° 284/0.30° 346/0.24° 462/0.18°

14mm/84° (1.25” – 2” O.D.) 143/0.59° 179/0.47° 218/0.39° 290/0.29°

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