User Manual

USING THE POLARIE
: Star-Scape Photography Mode
If this mode is selected, the Polarie tracks stars at half the speed of the diurnal motion of the stars. The terrestrial objects are trailed less as
compared with images taken by wide-field photography at a given exposure time. Short exposure times will allow you to take images with no star
trails. Photography at half the speed of the star's diurnal motion limits the movement seen in terrestrial objects. Adding landscape or
architectural objects in the foreground will make your photos more impressive.
The table below shows recommended maximum shutter exposure times to hold pinpoint
star images at Star-Scape mode.
f=100mm
2 sec.
2 sec.
2 sec.
3 sec.
3 sec.
4 sec.
5 sec.
8 sec.
15 sec.
f=85mm
3 sec.
3 sec.
3 sec.
3 sec.
4 sec.
5 sec.
6 sec.
9 sec.
18 sec.
f=50mm
5 sec.
5 sec.
5 sec.
6 sec.
7 sec.
8 sec.
10 sec.
16 sec.
31 sec.
f=35mm
7 sec.
7 sec.
8 sec.
9 sec.
10 sec.
12 sec.
15 sec.
22 sec.
45 sec.
f=28mm
9 sec.
9 sec.
10 sec.
11 sec.
12 sec.
15 sec.
19 sec.
28 sec.
56 sec.
f=24mm
11 sec.
11 sec.
12 sec.
13 sec.
14 sec.
17 sec.
22 sec.
33 sec.
65 sec.
f=20mm
13 sec.
13 sec.
14 sec.
15 sec.
17 sec.
21 sec.
27 sec.
40 sec.
78 sec.
f=15mm
18 sec.
18 sec.
19 sec.
21 sec.
23 sec.
28 sec.
36 sec.
53 sec.
105 sec
0° (Celestial equator)
±10°
±20°
±30°
±40°
±50°
±60°
±70°
±80°
Focal length of
photographic
lens(mm)
*1
Separation from
the celestial equator
Note
*1: The above focal lengths show actual focal lengths of your camera. It is not necessary to convert them to focal lengths in 35mm film format if APS-C, 3/4 or other format is utilized for your camera.
*2: The above exposure times are calculated on the assumption that the pixel size of an imaging device is 0.001mm. Allowable maximum exposure times will change according to the
specifications of your camera and lens. It is recommended you test your system to determine the best exposure time.
*3:The above exposure times will be extended by three times and more if you use a 35mm film format camera.
★
North
East
West
Large
Small
[Diurnal Motion of Stars]
Polaris
Short exposure time
prevents star trailing
19