Vaonis Vespera Pro - Information (2" Refractor)

Introduction | About Vespera Pro | Look | Sensor, Pixel Data, Field of View, Image Size (Pixels) | Visited Sky Objects | First Experiences and Photos | Photo Attempts | First Conclusions | Links || Appendix: Technical Data | Appendix: Comparison of the Vaonis Vespera, Vaonis Vespera Pro, and the Unistellar eVscope (2) | Appendix: Look | Appendix Photos

On this page, I provide some information about my future electronic 2" refractor telescope Vaonis Vespera Pro 50 mm/250 mm (f/5). I pre-ordered it on June 14, 2023; shipment is promised for May 2024.




Photo: Vaonis Vespera Pro (July 2023; prototype???)

Vespera Pro is an update of the telescope Vespera by the French company Vaonis. It can be preordered since mid-June 2023 on the Vaonis Website. Delivery of the telescope is scheduled for May 2024.

In the following, I try to collect information about the Vespera Pro as far as I could get them from the Vaonis Vespera Pro product page or other sources.


About Vespera Pro

What is Vespera Pro?

Vespera was meant to become a small and affordable version of Stellina. The Vespera Pro is an evolution of the Vespera with some changes from the original Vespera (sensor, focal length, aperture ratio).

Thus, it is also a refractor, the lens again is a quadruplet with 50 mm aperture (like binoculars), but with a focal length of 250 mm (aperture ratio f/5) and with a specially designed "pro" field corrector.

The Vespera Pro uses a Sony IMX676 Starvis 2 sensor with a resolution of 3536 x 3536 pixels (12.5 MP). This delivers a field of view of 1.6° x 1.6°, which makes also the Vespera Pro a small rich field telescope. Its image scale or sampling rate is 1.65"/pixel, which is much better than that for the original Vespera (2.99"/pixel). With a weight of 5 kg and a height of 40 cm, the Vespera Pro has remained light and compact, making it an ideal travel telescope. The internal battery lasts for 11 hours, which is quite a long time. I decided to go for the simple package without an additional high tripod (2000 EUR instead of 2500 EUR).

Here are some technical data:






  • Weight: 5 kg
  • Size: 15 x 8 x 3.5 in (40 x 20 x 9 cm)
  • Power supply: AC power with USB power supply
  • Autonomy: ≈ 11 hours of use with internal battery
  • Image processing: Integrated and adapted to target
  • Alignment: Automated
  • Focusing: Automated
  • Water resistance: IP43
  • Accessories included: an adjustable tripod, a hygrometer sensor
  • Control: Smartphone/Tablet
  • Objective: ED quadruplet refractor with Lanthanum glass (S-FPL52) and "pro" field corrector
  • Aperture: 2 in (50 mm)
  • Focal length: 10 in (250 mm)
  • Focal ratio: F/5
  • Focus: Integrated autofocus
  • Field of view: 1.6° x 1.6°
  • Magnification: 40 x???
  • File formats: JPEG, TIFF, FITS (16-bit RAW)


  • Sensor: Sony CMOS IMX676 (12.5 MP)
  • Pixel Resolution: 3536 x 3536
  • Pixel Size: 2.0µm x 2.0µm
  • Type: Alt-azimuth
  • Pointing: Automated with star aiming technology
  • Guiding: Autonomous autoguiding included
  • Field derotation: done in the software


  • Filter: Light pollution (CLS), Dual Band, and Solar filter optional
  • Dew control: Dew sensor integrated (heater inbuilt)

More on this telescope on the Vespera Pro product page.

Why Did I Opt for the Vaonis Vespera Pro?

Especially since the introduction of the Mosaic mode, I am very fond of my Vespera. The appeal of the Vespera Pro for me was that the new sensor has a higher resolution and its field of view is 1.6° square. This makes the Vespera Pro almost a rich-field telescope, especially in mosaic mode (maximum 2.6° squared).

Who is Behind the Vaonis Vespera Pro?


Cyril Dupuy, founder and CEO of Vaonis, in an interview


The manufacturer's team

(Photos from the Vaonis-Website (EN); permission for use granted)

Vaonis is a French company based in Montpellier, France, that designs and manufactures telescopes and accessories. The company was founded in 2016 by Cyril Dupuy, a young start-up entrepreneur, after obtaining his Bachelor in Optics and Aerospace. From his experience of using different telescopes with complex installation, long user guides and recurring breakdowns, he imagined and designed Stellina, the world's first all-in-one telescope connected to a mobile app. Vaonis' products are designed and developed by specialists in optics, mechanics, electronics, material and ergonomics, giving special attention to its design, quality and safety. (From the Vaonis Website, adapted)



In preparation

Here I will present photos of the unboxing, the telescope itself, and its first accessories (tripod, power supply).


Sensor, Pixel Data, Field of View, Image Size (Pixels)

The Vespera Pro uses the new sensor Sony IMX676 (CMOS; Starvis 2), with a used pixel size of about 12.5 megapixels, or 3536 x 3536 pixels (H/V). The pixel size is 2.0µm (quadratic pixels).

With this, all sizes are known to calculate the field of view of the Vespera, which amounts to 1.6° x 1.6°.

The following table shows the Vespera Pro, Vespera, eVscope, and eVscope 2 in comparison with my current telescope (plus the C8 that I owned) tubes at a selection of cameras that I own(ed):

Field of View
Telescope Reducer Focal
Aperture f ASI224MC* ASI294MC ASI462MC Atik Infinity* Remarks
PS 72/432 --- 432 72 7 0.65° x 0.48° 2.54° x 1.73° 0.74° x 0.42° 1.19° x 0.89° The largest FOV of my tubes
C5 --- 1250 127 10 0.22° x 0.17° 0.88° x 0.60° 0.26° x 0.15° 0.41° x 0.31° FOV like C8 with reducer
C5 f/6.3 787.5 127 6.3 0.36° x 0.17° 1.40° x 0.95° 0.41° x 0.23° 0.65° x 0.49° FOV a little smaller as with TLAPO1027
C8* --- 2032 203 10 0.14° x 0.1° 0.54° x 0.37° 0.16° x 0.09° 0.25° x 0.19° The smallest FOV
C8* f/6.3 1280 203 6.3 0.22° x 0.16° 0.86° x 0.58° 0.25° x 0.14° 0.4° x 0.3° FOV like C5
TLAPO1027 --- 714 102 7 0.39° x 0.29° 1.54° x 1.05° 0.45° x 0.26° 0.72° x 0.54° FOV a little larger than for C5 with reducer
          in Degrees in Minutes      
eVscope* --- 450 114 4 0.61° x 0.46° 36.7' x 27.6'     Same sensor as ASI224: Sony IMX224
eVscope 2* --- 450 114 4 0.78° x 0.57° 47' x 34'     New sensor: Sony IMX347
Vespera   200 50 4 1.6° x 0.9° 96' x 54' (ca.)     Same sensor as ASI462: Sony IMX462
Vespera Pro   250 50 5 1.6° x 1.6° 96' x 96' (ca.)     New sensor: Sony IMX676

*) No longer in my possession

Image Size (Pixels)

Sony's IMX676 sensor can be used with 3536 x 3536 pixels (12.5 MP; recommendation by Sony). However, the resultig photos may often be somewhat smaller because they are automatically cropped, probably in response to field rotation.

Field of View (FOV)

The Vespera Pro has double the FOV of the Vespera (calculated with

Simulation of the FOV by Vaonis, rotated for 180° (product page for Vespera Pro):

And another comparison with the Sky-Watcher EvoGuide 50ED (calculated with


Visited Sky Objects

In preparation


First Experiences and Photos

In preparation


First Conclusions

In preparation




Appendix: Technical Data for the Vaonis Vespera Pro





Sensor Data


Appendix: Comparison of the Vaonis Vespera, Vaonis Vespera Pro, and the Unistellar eVscope (2)

  Vespera Vespera Pro eVscope eVscope 2
Weight 5 kg (11 lbs) 5 kg (11 lbs)

9 kg (19.8 lbs) including tripod

9 kg (19.8 lbs) including tripod

Height 40 cm (15 in) 40 cm (15 in) 65 cm (25.5 in) 65 cm (25.5 in)
Width 20 cm (8 in) 20 cm (8 in) 23 cm (9 in) 23 cm (9 in)
Depth 9 cm (3.5 in) 9 cm (3.5 in) n.a. n.a.
Telescope type Refractor Refractor Reflector (Newtonian) Reflector (Newtonian)
Lens/Mirror Apochromatic Quadruplet Apochromatic Quadruplet mirror mirror
Lens/Mirror special features Extra low dispersion S-FPL52 equivalent (ULD) with lanthanum glass Extra low dispersion S-FPL52 equivalent (ULD) with lanthanum glass BK7 glass mirror BK7 glass mirror
Aperture 50 mm 50 mm 112 or 114 mm 112 or 114 mm
Focal length 200 mm 250 mm 450 mm 450 mm
Focal ratio F/4 F/5 F/4 F/4
Field of view 1.6° x 0.9° 1.6° x 1.6° 0.61° x 0.46° (36.7' x 27.6') 0.78° x 0.57° (47' x 37')
Mount Alt-azimuth Alt-azimuth Alt-azimuth Alt-azimuth
Field derotator no, done in software no, done in software no, done in software no, done in software
Image sensor Sony IMX462 Sony IMX676 Sony IMX224 Sony IMX347
Resolution 1920 x 1080 (2MP) 3536 x 3536 (12.5MP) 1280 x 960 (1,2 MP) / 2560 x 1920 (2,4 MP) scaled (EV mode) 2048 x 1536 (3,2 MP), 3200 x 2400 (7,7 MP) scaled (EV mode)
Sensor size 1/2.8" 1/1.6" 1/3" 1/1.8"
File formats JPEG, TIFF, FITS (TIFF/FITS in 16 bits) JPEG, TIFF, FITS (TIFF/FITS in 16 bits) PNG PNG
USB port (pictures download) no (with Wi-Fi) no (with Wi-Fi) no (with Wi-Fi) no (with Wi-Fi)
Autofocus yes yes no no
Light pollution filter Optional Optional no, done in software no, done in software
Dew control Yes as soon as the (optional) sensor is installed yes no no
Temperature/humidity sensor Optional yes no no
Battery type Integrated Integrated Integrated Integrated
Battery life up to 8 h up to 11 h up to 10 h up to 10 h
Water resistance IP43 IP43??? n.a. n.a.
Multi user mode up to 10 users* up to 10 users yes (number unknown) yes (up to 10 users)
Number of objects in data base 300+ (July 2023) 300+ (July 2023) > 5000, > 120 with descriptions > 5000, > 120 with descriptions
Object access via coordinates yes yes yes yes
2021/2022 Developments
Solar pointing yes (with optional filter) yes (with optional filter) yes (with optional filter) yes (with optional filter)
Connected battery possible possible possible possible
Connection to Wi-Fi hotspots no no no no
Scheduling of observations up to 3 objects* up to 3 objects* no no
Expert mode (camera control) yes* yes manual pre-processing (brightness, background) already available in 2020 manual pre-processing (brightness, background)
HDR Image processing yes yes no no
Pictures stocking in the app up to 100 images up to 100 images??? no, on the smartphone depending on its memory size no, on the smartphone depending on its memory size
Mosaic mode 3.2° x 1.8° (4 x sensor field) at maximum, up to 8 MP 2.6° x 2.6° at maximum, up to 32 MP no no

*) Vaonis decided in summer 2022 to open certain pro software features to Vespera as well.


Appendix: Look

In preparation

Here I will present photos of the Vespera Pro that Vaonis published.

Photo: Vaonis Vespera Pro (July 2023; prototype???)


Appendix: Photos

In preparation

Here I will present photos taken with the Vespera Pro that Vaonis published.


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