Meade Lightbridge Information (10" Dobson)

Look | Basic Data | First Photo Attempts | Visited Sky Objects | Conclusions | Links

On this page, I present some information about my Meade LightBridge 10" Dobson telescope (purchased in October, 2009). The basic data for this telescope (and its siblings) was collected from the Astrocom Website (www.astrocom.de), the company where I bought the telescope (it no longer sells telescopes).

Note: I sold the telescope in March 2016 (see below). I therefore can no longer report any experiences with this scope here.

 

Look

The top row shows views of my 10" Dobson telescope (left: with stray light protection, center: size comparison with Meade ETX-90EC). Then, there are some comparisons with my 5" Dobson Heritage P130. The bottom row also shows my Revelation eyepiece suitcase, which I bought to complement the telescope (10" Dobson and suitcase were bought from Astrocom - the telescope was a demonstration sample).

The Revelation eyepiece suitcase contains 5 Plössl eyepieces 1.25" (9 mm, 12 mm, 15 mm, 20 mm, and the highly praised 32 mm Digi-Scope eyepiece), a 1.5 x/2 x Barlow lens, a moon/gray filter, 4 color filters for planet observations (colors: #11 yellow-green, #25 red, #47 violet, and #82A lightblue) and a 1.25" photo adaptor with T2 mount (M42 x 0.75 mm).

 

Basic Data for Meade LightBridge 10" Dobson Telescope (in Comparison)

Telescope
Meade
Sky-Watcher Skymax/Heritage/Explorer
GSO
8" 10" 12" 16" 76 100P 114P P130 150PDS GSD 680
Optical Design Newton
(Parabolic)
Newton
(Parabolic)
Newton
(Parabolic)
Newton
(Parabolic)
Newton (Spherical) Newton (Parabolic) Newton
(Parabolic)
Newton (Parabolic) Newton (Parabolic) Newton (Parabolic)
Primary Mirror Diameter 203 mm 254 mm 305 mm 406 mm 76 mm (3") 100 mm (4") 114 mm (4.5") 130 mm (5") 150 mm (6") 200 mm (8")
Focal Length, Focal Ratio 1219 mm
f/6
1270 mm
f/5
1524 mm
f/5
1829 mm
f/4.5
300 mm
f/3.95
400 mm
f/4
500 mm
f/4.38
650 mm
f/5
750 mm
f/5
1200 mm
f/6
Resolving Power (arc secs) 0.56" 0.45" 0.38" 0.28" 1.51" 1.15" 1.01" 0.9" 0.77" 0.58"
Limiting Visual Stellar Magnitude ca. 14 mag ca. 14.5 mag ca. 15 mag ca. 16 mag 11.2 mag 11.8 mag 12.1 mag 13.3 mag 12.7 mag 14.5 mag
Light Gathering Power 841 1316.7 1898.5 3364 117.9 204.1 265.2 344.9 459.2 816.3
Maximum Practical Visual Power ca. 550 x ca. 600 x ca. 700 x ca. 900 x ca. 100 x (152 x) 150 x (200 x) 170 x (228 x) ca. 195/220 x (260 x) ca. 225 x (300 x) ca. 300 x (400 x)
Optical Tube Dimensions (diam. x length) 28 cm x 115 cm 35 cm x 119 cm 40 cm x 144 cm 51 cm x 170 cm n.a. 11.5 cm x 37 cm* n.a. Tube collapsed < 37 cm
(14.5") long
18.2 cm x 69 cm
18 cm x 68 cm*
23 cm x 115 cm
Net Weight Basis 9 kg 12.2 kg 15 kg 24 kg   1.3 kg* 1.6 kg 3.1 kg* -- 11.2 kg
Net Weight Optical Tube 10.9 kg 17.2 kg 21.3 kg 33.6 kg   1.2 kg* 3.7 kg 3.25 kg* 5.0/6.0 kg
5.5 kg*
9.5 kg
Net Weight Complete 1.75 kg 2.5*/2.8 kg 5.3 kg < 6.5 kg or 14 lbs. appr. 21 kg

Dark Blue: Telescopes that I still own; italic and dark red: telescopes that I owned; black: for comparison; *) own measurement

 

First Photo Attempts

Photos with Camera held to the Eyepiece

My first photo attempts were devoted to the moon, again based on the 1:50 method. Regrettably, the moon was already too close to full moon. I was able to shoot at least one usable photo (my further attempts looked similar):

Click image for larger version!

Photos with Camera (Ricoh GXR) Mounted to the Eyepiece

See my photo attempts with the camera (Ricoh GXR) mounted to the eyepiece on pages:

 

Visited Sky Objects

I cannot remember, which sky objects I visited with the Meade 10 "Dobson telescope, but least these are for sure :

 

Conclusions

The Meade 10 "Dobson telescope yielded the best results of all the telescopes that I have owned so far, regarding the Moon, the planets, as well as the few nebulae that I have observed. Due to its high magnification (because of the long focal length) and its large aperture (10 "= 25 cm) this was to be expected. The difference to the Heritage P130 was, however, not as large as I had expected. Perhaps my expectations as to a telescope of this aperture and quality were too high, especially since the observation conditions (the "seeing") were not always the best, (I struggled a lot with air turbulence, in particular). Maybe I should have bought a collimator earlier, but I just did not dare to adjust the scope for a long time... Actually, the telescope did not appear to be really maladjusted, when I checked it with a laser collimator for the first time.

Moon photos turned out pleasingly sharp, and the planets Venus, Jupiter, and Saturn could be easily observed with the eye in some detail (crescent, stripes, moons, ring; I was not able to recognize the Cassini division in the Saturn ring, maybe the air turbulence was too high). The latter was especially true after I finally tried to adjust the telescope (which I did in 2015, a long time after the purchase of the telescope).

Note: Regrettably, I cannot post any further impressions on this telescope here, because I sold it in March 2016 due to the high weight of the assembled optical tube (over 17 kg). Only with difficulty, I was able to carry the tube with my "damaged" and, later, "repaired" hips.

 

Links

 

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06.05.2017