The different types of Starfinders


The MEADE Starfinders come in different types. First, we have to distinguish the different
sizes in aperture.
The smallest Newtonian of this family yet has an aperture of 6 inches (153mm). Furthermore
there are aperture sizes of 8", 10" and 16" available, as well  Dobsonian or equatorially mounted.
Between the 10-inch and the 16-inch Dobsonians, there also comes a mid-size 12.5-inch
Dobsonian. If you have a closer look to the German equatorial Starfinder mounts, it will be
clear, why there is no 12.5-inch equatorial version:
There are two versions of the Starfinder equatorial mount, the SF1 for the 6-, 8- and 10-inchers
and the much more mightier (and more expensive, of course) SF2 for the 16-inch scope.
The SF1 is on its limit when loaded with the 10-inch tube, the 12.5" with it's roughly 50%
higher focal length would be too bulky for the SF1. So, you would need the SF2. This one's
much more expensive. The price gap between the 12.5" and the 16" tubes has nearly no
weight in comparison to the total amount of the 16" EQ. In terms of numbers, its only about
10%! The SF2, as bulky as it is, is only usable in a stationary setup. So, why bother with the
smaller 12.5 inches of aperture?
Here if have put together a table with all the technical data of the complete Starfinder family:

Meade Starfinder
EQ 6"
EQ 8"
EQ 10"
EQ 16"
Dob 6"
Dob 8"
Dob 10"
Dob12,5"
Dob 16"
Aperture [mm]
152
203
254
406
152
203
254
318
406
Focal length [mm]
1220
1220
1140
1830
1220
1220
1140
1525
1830
Focal ration
f/8
f/6
f/4.5
f/4.5
f/8
f/6
f/4.5
f/4.8
f/4.5
Separation ["]
0,74
0,56
0,45
0,28
0,74
0,56
0,45
0,36
0,28
Visual limit
13m5
14m0
14m5
15m6
13m5
14m0
14m5
15m0
15m6
Photographic limit
16m0
16m5
17m0
18m1
16m0
16m5
17m0
17m4
18m1
Focal scale, °/inch
1,18
1,18
1,26
0,79
1,18
1,18
1,26
0,95
0,79
Size of picture (24mmx36mm) [°x°]
1,11x1,58
1,11x1,58
1,19x1,70
0,74x1,06
1,11x1,58
1,11x1,58
1,19x1,70
0,89x1,27
0,74x1,06
Maximum magnification
400
500
600
600
400
500
600
600
600
Secondary mirror [mm]
30
47
61
102
30
47
61
66
102
Obstruction [%]
3,9
3,6
5,6
6,2
3,9
3,6
5,6
4,3
6,2
Tube diameter [mm]
194
244
323
483
194
244
323
384
483
Tube length [mm]
1220
1220
1143
1677
1220
1220
1143
1474
1677
Column height [mm]
610
610
610
458
 --
 --
 --
 --
 --
Column diameter [mm]
102
102
102
153
 --
 --
 --
 --
 --
Setting circle RA [mm]
178
178
178
153
 --
 --
 --
 --
 --
Setting circle DE [mm]
77
77
77
153
 --
 --
 --
 --
 --
Polar angle [°]
5 bis 60
5 bis 60
10 bis 60
25 bis 60
 --
 --
 --
 --
 --
Total weight [kg]
25,9
31,3
44
112,1
Heaviest component[kg]
15,9
15,9
15,9
28,2
Tube weight [kg]
 --
 --
 --
 --
9,1
11,8
13,6
25
45,4