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 was promised for May 2024. And that was indeed the case. UPS initially reported a delivery of my Vespera Pro on May 3, 2024, but after two sort erors it only arrived on May 8, 2024. Not too bad!





Photo: My Vaonis Vespera Pro (May 8, 2024)

Vespera Pro is an update of the Vespera electronic telescope from the French company Vaonis (in the meantime there appeared a version limited to 222 samples called Passenger and the successor model Vespera II). It has been available for pre-order on the Vaonis Website since mid-June 2023. Delivery of the telescope was promised to take place in May 2024 for the first pre-orders and started in the beginning of May 2024. Later pre-orders are to be delivered from July 2024 on; the price has also been gradually increased.

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 and from my experiences with my own sample (particularly the unboxing photos).


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). It also has some "pro features" that the other Vespera models do not offer.

Thus, the Vespera Pro 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. It looks more or less identical to the other Vespera models, has the same size and weight as the other models.

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), which I had already bought.

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), same hygrometer sensor as for the original Vespera

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)



Here I present photos of the unboxing, the telescope itself, and its initially delivered and bought accessories. Since much of it looks like the original Vespera, I will show less photos here.

The Box, the Hard Case, the Content, ...


The outer box


Outer box opened, hard case visible


Outer box and hard case (taken out of the box)


Technical data on the hard case


The hard case (for storage and transportation)


Hard case opened, content visible


Hard case opened, content closer view


Hard case opened, content closer view


Empty hard case (content taken out)

Unpacked Hard Case Content, Telescope, ...


Content of the hard case...


Ditto, tripad assembled (with bubble level) but not extended


"Vespera Pro" label on the telescope


Technical data at the bottom and USB-C connector




Vespera Pro with bubble level on tripod


Arm starts to move


Arm stopped moving...


USB charger and (extra) USB-C charging cable  

USB charger and (extra) USB-C charging cable


USB charger




Vespera Pro charging

Further Accessories


Lens cover for dark and flat frames


Ring, used when working without filters


Safety lock


Lens cover for dark and flat frames, installed


Ring, used when working without filters, installed


Vespera Pro with cover on tripod


Bubble level


Ditto, bottom side


Vespera Pro with bubble level on tripod

Bubble level installed   Bubble level installed  

Vespera Pro charging (with bubble level)


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'     1.72 Same sensor as ASI224: Sony IMX224
eVscope 2* --- 450 114 4 0.78° x 0.57° 47' x 34'     1.33 New sensor: Sony IMX347
Vespera*   200 50 4 1.6° x 0.9° 96' x 54' (ca.)     2.99 Same sensor as ASI462: Sony IMX462
Vespera Pro   250 50 5 1.6° x 1.6° 96' x 96' (ca.)     1.65 New sensor: Sony IMX676

*) No longer in my possession
*) IS = image scale: describes the relative sizes of objects at 1:1 pixels (the larger the number, the smaller the objects)

Image Size (Pixels)

Sony's IMX676 sensor can be used with 3536 x 3536 pixels (12.5 MP; recommendation by Sony). However, the resulting 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 nearly double the FOV of the Vespera (calculated with

Vespera Pro in red (Custom Camera)

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

Vespera Pro in red (Custom Camera)

Field of View in Mosaic Mode

4.18° x 2.45° or 3.2° x 3.2°


Visited Sky Objects

These are the very first DSO (during the first two months) and objects that I observed with my Vespera Pro:


First Experiences and Photos

For space reasons, I moved my first experiences with and photos taken with my Vespera Pro to a seperate page.


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 (2 MP) 3536 x 3536 (12.5 MP) 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 8 users up to 8 users yes (number unknown) yes (up to 10 users)
Number of objects in data base 300+ (July 2023)
4000 (extended)
300+ (July 2023)
4000 (extended)
> 5000, > 120 with descriptions > 5000, > 120 with descriptions
Object access via coordinates yes yes yes yes
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 yes yes 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 3.2° x 3.2° (4 x sensor field) at maximum, up to 50 MP no no


Appendix: Look

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


Photo: Vaonis Vespera Pro (mid-July 2023)   Photo: Vaonis Vespera Pro (May 2024; larger)

As I now can take photos of the Vespera Pro on my own, I will not present further photos published by Vaonis.


Appendix: Photos

Here I present two photos taken with the Vespera Pro that Vaonis published. Probably, the photos were post-processed.

Photo: NGC 6992/5 (Eastern Veil Nebula) photographed with Vespera Pro - the very first photo taken with the Vespera pro that Vaonis published (larger)

Photo: M 8 (Lagoon Nebula) taken with the Vespera Pro (from Vespera Pro product page, slightly cropped)


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