Meade Instruments Starfinder 12.5 User Manual

Page 10

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Specifications and Features: Meade Starfinder

™

Dobsonian Telescopes

TELESCOPE:

Starfinder

Dobsonian 6

Dobsonian 8

Dobsonian 10

Dobsonian 12.5

Optical Design

Newtonian Reflector

Diameter/Clear Aperture

152mm (6")

203mm (8")

254mm (10")

318mm (12.5")

Primary &

Grade-A Pyrex

glass,

Grade-A Pyrex

glass,

Grade-A Pyrex

glass,

Grade-A Pyrex

glass,

Secondary Mirrors

fine annealed

Secondary Mirror Support

4-vane; steel

Focal Length

1220mm

1140mm

1525mm

Focal Ratio

f/8

f/6

f/4.5

f/4.8

Resolving Power (arc secs.)

0.74

0.56

0.45

0.36

Limiting Visual Magnitude

13.5

14.0

14.5

15.0

Limiting Photographic Magnitude

16.0

16.5

17.0

17.4

Image Scale

1.18°/inch

1.26°/inch

0.95°/inch

Maximum Practical Visual Power

400X

500X

600X

35mm Angular Film Coverage

1.11° x 1.58°

1.19° x 1.70°

0.89° x 1.27°

Optical Tube

7.6" dia. x 48" long-

9.6" dia. x 48" long-

12.7" dia. x 45" long

15.1" x 58" long

spiral-wound Sonotube

Secondary Mirror Minor Axis

1.18"

1.83"

2.37"

2.60"

Secondary Mirror Obstruction

3.9%

3.6%

5.6%

4.3%

Dobsonian Mounting

Base Diameter

13.75"

17.1"

22.2"

26.75"

Mount Dimensions (approx.) 12" square x 19" high

16" square x 17" high

21" square x 20" high

25" square x 22 " high

Materials-- ----------------All models: thermally-fused Melamine

with industrial particle board core.---------------

Bearings: Altitude

Nylon

Azimuth

Teflon

Net Weights: Optical Tube

20 lbs.

26 lbs.

30 lbs.

55 lbs.

Mounting

14 lbs.

18 lbs.

32 lbs.

41 lbs.

Shipping Weight (approx.)

38 lbs.

49 lbs.

68 lbs.

106 lbs

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