Levenhuk Discovery Spark AZ-Serie Bedienungsanleitung Seite 12

same magnification. And the best advantage is that a Barlow lens can potentially double the number of eyepieces in your
collection.
Optical finderscope assembly and alignment
Unthread two screws in the back of the telescope tube. Place the finderscope base above the holes on the tube. Lock the
finderscope base into position by tightening the screws (fig. 4).
Optical finderscopes are very useful accessories. When they are correctly aligned with the telescope, objects can be quickly
located and brought to the center of the view. Turn the scope end in and out to adjust focus (fig. 7).
To align the finderscope, choose a distant object that is at least 550 yards (500 meters) away and point the telescope at the
object. Adjust the telescope so that the object is in the center of the view in your eyepiece. Check the finderscope to see if the
object is also centered on the crosshairs. Use three adjustment screws to center the finderscope crosshairs on the object.
Focusing
Slowly rotate the focus knobs one way or the other until the image in the eyepiece is sharp. The image usually has to be
finely refocused over time due to small variations caused by temperature changes, flexures, etc. Refocusing is almost
always necessary when you change an eyepiece, add or remove a Barlow lens (refractor 6a, reflector 6b).
Operating the mount
The AZ mount is an alt-azimuth mount that allows you to rotate the telescope about the vertical and horizontal axes and
change its altitude and azimuth. To adjust the azimuth, loosen the big locking knob under the mount base and rotate
the tube left or right about the axis then retighten it. Tighten the altitude slow-motion control for more precise height
adjustment. Then, rotate the knurled wheel on the altitude slow-motion control rod.
For more precise motions use the altitude slow-motion control. Due to Earth's movement, the objects will be constantly
shifting out of your view, so you will have to adjust the altitude and azimuth of your telescope to continue your
observations.
Reference materials usually list declination coordinates in degrees, hours and minutes above or below the horizon line.
Azimuth coordinates may sometimes be listed with the compass points (N, SW, ENE, etc.), but it is more commonly listed
in degrees around the 360-deg plane, where north is 0°, east is 90°, etc. (fig. 8).
Specifications
Discovery
Spark 506 AZ
Optical design
Optics material
Aperture, mm
Focal length,
600
mm
Highest
practical 100
power, x
Focal ratio f/12
Tube material
Mount
Eyepiece barrel
0.965"
diameter
aluminum,
Tripod
630—1130mm
Accessory tray
Finderscope 5x24, optical
6mm
Eyepieces
20mm
Diagonal
90°
mirror
Barlow lens
Erecting
eyepiece
The manufacturer reserves the right to make changes to the product range and specifications without prior notice.
Discovery
Spark 607 AZ
refractor
50 60
700
120
f/11.6
0.965"
aluminum,
600—1000mm
– +
5x24, optical
4mm
12.5mm
20mm
90°
3x 3x
– 1.5x
Discovery Discovery
Spark 703 AZ Spark 707 AZ
optical glass with anti-reflective coating
70
300
140
f/4
metal
azimuth (AZ)
0.965"
aluminum, aluminum,
350mm 670—1230mm
–
– 5x24, optical
6mm
20mm
90°
3x
1.5x
12
Discovery
Spark 767 AZ
Newtonian reflector
70 76
700 700
140 152
f/10 f/9
1.25" 0.965"
aluminum,
600—1000mm
+ +
5x24, optical
4mm 4mm
12.5mm 12.5mm
20mm 20mm
90° –
3x 2x
1.5x –
Discovery
Spark 114 AZ
114
900
228
f/7.9
1.25"
aluminum,
670—1230mm
+
6x30, optical
4mm
12.5mm
20mm
–
2x
–