Bresser Venus 76/700 AZ Information (3" Newton)

Look | Basic Data | Photo Attempts | Visited Sky Objects | Final Words | Links

On this page, I present some information about my previous telescope, Bresser Venus 76/700 AZ Newtonian telescope. It was my very first telescope and I do no longer know when and where (Aldi or Tchibo, I assume...) I purchased it. I sold it in 1999, after I had acquired a Meade EXT-90C.

Note: I sold the telescope in 1999. I therefore can no longer report any experiences with this scope here.

 

Look

    

Views of my Bresser Venus 76/700 AZ Newtonian telescope which I found in my photo collection. I no longer owned the telescope when I took the photos. And it is purely by accident that the telescope appears on the photos (sections).

 

Basic Data for Bresser Telescope Venus 76/700 AZ (in Comparison)

Telescope
Bresser
Sky-Watcher Skymax/Heritage/Explorer
GSO
Venus 76/700 AZ 102 76 100P 114P P130 150PDS GSD 680
Optical Design Newton Maksutov-Cassegrain Newton (Spherical) Newton (Parabolic) Newton
(Parabolic)
Newton (Parabolic) Newton (Parabolic) Newton (Parabolic)
Primary Mirror Diameter 76 mm (3") 102 mm (4") 76 mm (3") 100 mm (4") 114 mm (4.5") 130 mm (5") 150 mm (6") 200 mm (8")
Focal Length, Focal Ratio 700 mm
f/9.2
1300 mm
f/12.7
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) 1.51" 1.15" 1.51" 1.15" 1.01" 0.9" 0.77" 0.58"
Limiting Visual Stellar Magnitude 11.2 mag 12.7 mag 11.2 mag 11.8 mag 12.1 mag 13.3 mag 12.7 mag 14.5 mag
Light Gathering Power 117.9 212.3 117.9 204.1 265.2 344.9 459.2 816.3
Maximum Practical Visual Power 152 x 204 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) n.a. 10.4 cm x 27 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 n.a. --- n.a. 1.3 kg* 1.6 kg 3.1 kg* -- 11.2 kg
Net Weight Optical Tube n.a. 1.9 kg n.a. 1.2 kg* 3.7 kg 3.25 kg* 5.0/6.0 kg
5.5 kg*
9.5 kg
Net Weight Complete n.a. 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

 

Photo Attempts

The following photos of the moon were taken with a digicam Nikon Coolpix 900s and the Bresser Venus telescope in April and in May 1999. I held the camera simply against the eyepiece of the telescope. This technique has been named "1:50 technique", because you have to take 50 photos in order to get one sharp photo...

         
         
     

 

Visited Sky Objects

I visited the following sky objects with the Meade ETX-90EC:

 

Conclusions

The Bresser Venus 76/700 AZ telescope was my very first telescope, which I probably acquired at Aldi or Tchibo, because it enticed me to buy it. I have virtually no memories of this telescope, but there are still a few moon shots that I created with it.

If I compare the Bresser Venus telescope with my later "small" Sky-Watcher telescopes, the aperture ratio drops to f/9.2 (compared to f/4 and less ...), as well as the long focal length of 700 mm (versus 300-400 mm). Thus, the telescope achieves significantly higher magnifications for the same eyepieces than the Sky-Watcher telescopes, but is less suitable for observing deep sky objects. Accordingly, it is also advertised as a lunar and planetary telescope. Also note that the aperture ratio of f/9.2 allows to use cheaper eyepieces, which can be an advantage, particularly for beginners.

The currently supplied accessories differs somewhat from the ones that I had acquired, at least as far as the viewfinder is concerned. This is now a red-dot finder. The telescope is advertised as allowing magnifications between 35 x and 525 x. 525 x can indeed be achieved if the the 4 mm eyepiece and the 3 x Barlow lens are considered, but I have no idea what you can still recognize using this combinations. There is, however, also a recommended maximum magnification of 152 x listed in the technical data, but 114 x would be more appropriate... The 4 mm eyepiece appears as a debatable choice to me, because using it, the telescope gets clearly above the maximum recommended magnification (the telescope achieves 175 x with it - instead of 152/114 x). With the Sky-Watcher kit eyepieces of 25 mm and 10 mm and possibly a good 1.5 x Barlow lens, the Venus would certainly be better and more sensibly equipped. Well, I unfortunately (or fortunately ...) I can no longer verify this...

 

Links

 

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07.11.2017