Unistellar eVscope: Selected/Adapted Questions from the Vaonis FAQ/Kickstarter Forum

Introduction | Overview of the Questions | Selected/Adapted Questions from the Vaonis FAQ/Kickstarter Comments | Links

On this page I present selected/adapted questions from the Vaonis FAQ and the Kickstarter comments on Vespera, plus some that I myself thought of, regarding my (hopefully) forthcoming electronic 2" refractor telescope Vaonis Vespera 50 mm/200 mm (f/4). This FAQ can be regarded as a "permanent construction site"...

Note: See also page Vaonis Vespera - Information



Since the Vaonis FAQ is very detailed and extensive, I only selected questions that I think are interesting. Mostly these are technical questions or questions concerning observation. Some of these things are also discussed in the Kickstarter comments, partly answered by Vaonis, so I have also included such questions or will include them in the future. And last but not least, there is one or the other question that I am trying to answer myself...

Furthermore, I tried to arrange the questions according to topics.

In any case or if in doubt, I do recommend consulting the original Vaonis FAQ.

Note: I may add further questions in due course...


Overview of the Questions

Troubleshooting, Maintenance

Telescope, General Questions


Operation, Observation

Wi-Fi, Internet

Add ons: Filters, Heating, Backpack, Tripod


Selected/Adapted Questions from the Vaonis FAQ/Kickstarter Comments

Troubleshooting, Maintenance

Question: What will happen in the event of a breakdown/breakage?

Since Vespera is a brand new product, it may have youthful defects. In case of proven defects, failure or breakage, we invite you to contact our support department at support@vaonis.com. After a diagnosis with one of our technicians, your product will either be repaired remotely with a software update or has to be sent back to our factories for repair.

Repair support is only available in countries where delivery is offered..

Telescope, General Questions

Question: An aperture of 50mm is very small. Why this choice?

Vaonis: You would be amazed what you can get with a 50mm apochromatic quadruplet! Just look at the results of the RedCat bezel, which alone (no frame, tripod or on-board computer) costs $750 (astrobackyard.com/william-optics-redcat-51/)

The most important thing to remember with Vespera :

We challenge anyone to do better in less than 10min :)

Question: Can I use Vespera in cities, how sensitive is it to light pollution?

Yes, Vespera can be used in light polluted areas. An optional light pollution filter will be offered as an accessory.

Question: Can I observe the planets with Vespera?

Vespera is mainly designed for deep sky observation (+ Moon and Sun) but it will be possible to point to the planets. They will appear very small in the field of the picture, but you will still be able to distinguish details such as the rings of Saturn and the bands of Jupiter.

Question: Can I do solar observations with Vespera?

Yes, a solar filter (ND - Neutral Density) will be available as an accessory.

Question: Is there a limit to the apparent magnitude of stars that Vespera can detect?

Yes, Vespera does 10-second exposures and their stacking makes it possible to reach a magnitude higher than 13 mag under a good sky.

Question: Will the observation of comets and asteroids be possible with Vespera?

This feature will be first available in manual pointing (by entering coordinates), then in the catalog of pre-configured objects.

Question: What is the field of view and the pixel scale of Vespera?

The field of view is 1.6° x 0.9°, the pixel scale is 3".

Questions: What is the sensor used in Vespera? What is the resolution of the images that Vespera captures?

This is a Sony Starvis CMOS IMX462LQR sensor (1/2.8") of the latest generation that offers excellent performance in terms of noise and sensitivity in low light. The sensor has a raw image size of 1945 x 1109 pixels, a maximum frame rate of 120 fps, and square pixels of 2.9µm x 2.9µm.

Vespera uses the recommended pixel size for the sensor of 1920 x 1080 (full HD). There will also be a mosaic mode (4 x 4) available for Vespera.

Questions: Why do you not use a 4K (3840/2160) or larger (better) sensor inside Vespera? I saw on internet that the Sony IMX462 Starvis LPA is designed for lunar, planetary, autoguiding, and not for DSO? Is this right?

Cyril Dupuy (Vaonis; adapted): The IMX462 is the latest Sony sensor, so in terms of technology it is the right choice, although the resolution is not 4K. In terms of cost, it is impossible to integrate a larger sensor for the same price. Fortunately, the mosaic mode allows you to make images up to 4 x the size of the sensor.

Question: How is Vespera different from eVscope?

Cyril Dupuy (Vaonis): Vespera has a newer and more efficient sensor, autofocus, better optical quality. Vespera does have a smaller aperture but this is compensated by the exposure time, no false eyepiece, because we think the best and most comfortable eyepiece is your smartphone or tablet.

Question: What are the minimum/maximum temperatures in which Vespera can operate?

Vespera is designed to be used between -10° and 40° Celcius. Below -10°C the instrument will still be able to operate without risk of damage, but:


Question: How long does the battery last?

The battery is rated for an operation of up to 4 hours.

Question: Can the battery be replaced by the user?

No, the battery cannot be replaced by the user, it can only be replaced by Vaonis. Vespera has to be sent to Vaonis in France for a battery replacement.

Vaonis: If the battery happened to have any defect during the warranty, we would ship your product for free (it takes less than 48h to ship both ways), repair it, and ship it back in a timely manner. It is also possible to plug in an external battery.

Vaonis: If after several years the battery should weaken a bit, you can easily connect a power bank next to the Vespera. We have designed an instrument that is powered like your smartphone, in 5V. Therefore, any battery on the market will be able to power your Vespera for as long as you want!

Update: Vaonis will reconsider its decision not to make the battery user-replaceable and will publish its final decision on this matter before the end of the Kickstarter campaign.

Update: Vaonis declared on October 30, 2020 that it will stick to a battery than cannot be replaced by users.

Question: Is it possible to continue observing while charging the internal battery?

Yes! Vaonis answered in the comments of the Kickstarter campaign that this is possible. It should therefore also be possible to run Vespera on the balcony or terrace from a power supply unit to be independent from the runtime of the internal battery.

Question: Can I use a power bank?

Yes. As long as it has a USB-C port, it should work with Vespera. Other USB ports should work via adapter.

Question: Will instructions be available for opening up Vespera to replace a defective battery after the warranty expires?

Since the battery will not be user replaceable, there will be no instructions for replacing a defective battery. Affected users have either to send Vespera to France for battery replacement, or muddle their way through with an external battery; the latter should be possible.

Operation, Observation

Question: The observations are in real time, but you seem to combine multiple frames to get a better image quality - how do you do this?

With Vespera and its image processing software, you start to see images after just 10 to 15 seconds. Vaonis uses live stacking algorithms to stack each new image taken by the Sony sensor. So every 10 to 15 seconds you will see a new image, resulting from stacking with the previous image. Obviously, the longer you wait, the better is your photo. Typically, you need about 5 minutes for a good photos, but you may need 30 to 60 minutes for very good photos.

Question: How does Vespera handle setup/initialization?

Vespera is automatically set up / initialized in less than 5 minutes:

Question: What is the alignment procedure?

Vespera's alignment procedure is fully automatic. If the sky is sufficiently black and transparent, Vespera will be able to detect stars, take a picture and perform star field recognition. Among other things, this consists of analyzing the position of the stars among themselves and comparing this information with its internal data in order to determine its orientation. This last step is called astrometry.

Question: Is the focusing performed by Vespera manually or automatically?

The focus is managed automatically before each observation (autofocus). Vespera adjusts its focus with a similar approach than its alignment: it takes a picture of the sky and looks for the position of the focus for which the stars are the sharpest.

Question: Does Vespera track the stars?

Yes, Vespera integrates automatic tracking (GoTo), which allows to follow the movement of the star according to the movement of the Earth.

Question: How does Vespera compensate for the lack of a field derotator?

Vespera realizes unitary exposures of 10s. This is enough so that the field rotation is not visible on the raw images. Thus, the field rotation is compensated when stacking the images. Thanks to Vaonis' image processing algorithms which take into account the entire signal perceived in the field, it is therefore possible to stack images without limits and without field loss.

Question: How long can you exposure the object if there is no field derotator?

Vaonis: As much as you want! The field of view will be slightly smaller but there is no exposure time limit.

Vaonis: Field derotation is accomplished through stacking images like on Stellina or the eVscope. No single exposure is long enough at 200 mm to cause streaking of star images. I've exposed up to an hour with no streaks. The instrument always knows where it is in the sky due to these integrated technologies.

Question: Will it be possible to change Vespera's camera settings (exposure time, ISO...)?

No, these parameters are pre-defined and optimized so that you get the best quality/time during the use of Vespera.

Question: How do I observe with Vespera?

Preliminary: After the initialization procedure has finished, you select a target (called "pointing") and start the GoTo to access it. As soon as the target is reached and optimally positioned in the field of view, automatic tracking starts on the one hand, and stacking of images on the other. Vespera suggests an optimal exposure time for every object in its data base.

More to come...

Question: Will coordinate pointing be available in Vespera?

Yes, this feature will be available through Vespera. The coordinates used are those of the J2000 reference frame (right ascension and declination) and are accessible on sites such as Wikipedia or in applications like Stellarium.

Question: How is manual pointing accomplished?

Cyril Dupuy (Vaonis): A ll you need to do is enter the coordinates of the object in J2000 format and Vespera uses plate solving algorithms to guarantee a good centering of the requested area in the field.

Question: Is there a multi user mode on Vespera?

Yes, it is possible to connect up to 5 mobile devices simultaneously on Vespera. One of them will be considered as administrator and the others will be able to view the photographs taken with the instrument.

Question: How can I retrieve Vespera's photos?

Photos in JPEG and TIFF format can be saved directly to a mobile device. Photos in FITS format can also be transferred to a mobile device or to a cloud/server using Vespera's Wi-Fi.

Question: How many items are in the catalog?

Vespera and Stellina will offer the same object catalog (currently more than 200 objects). New objects are added with each update and a suggestion form is available in the app.

The objects that are not listed in the catalog are accessible via the pointing by coordinates, giving users access to an unlimited number of objects to be photographed.

Question: Where can I check which objects are included in the catalog?

The list of objects offered by Stellinap can be found in the Vaonis Help Center in the FAQ (Mobile App): support.vaonis.com/helpcenter/list-of-objects-found-in-stellinapp (List of objects found in Stellinapp.

In October 2020, the list contains all Messier objects, well known NGC and IC objects, the moon, seven planets, and other objects.

Question: Should I thermalize my Vespera?

Take Vespera out at least 30 minutes before starting the initialization so that the telescope is at the same temperature as the ambient temperature (it can influence the focus) (from Stellina FAQ, should be valid for Vespera as well).

Wi-Fi, Internet

Question: What will be the range of Vespera's Wi-Fi?

Just like Stellina, Vespera has its own Wi-Fi transmitter that allows users to connect with their mobile device to control it. The Wi-Fi targeted range is 30 meters (98ft), which will allow users to easily install Vespera in their garden and control it without losing network from home.

Question: Is it necessary to be connected to the Internet to use Vespera?

No. Vespera uses a Wi-Fi network to communicate with your smartphone, but that does not mean it needs an Internet connection. When users install the instrument, they simply need to go to their Wi-Fi settings and connect to the signal emitted by Vespera (similar to Bluetooth on other devices).

Users only need the Internet to:

Please note that in order to continue surfing the Internet, users will need to use the Data network (4G) of their phones as the Wi-Fi network will already be used by Vespera.

Question: What if I am at a place that there is no signal for my phone? Will Vespera be able to connect to some other kinds of GPS devices and still use phone to show the picture?

Vaonis: Not to worry, you do not need phone service to use your Vespera with your smartphone/tablet. You only need signal/service or Wi-Fi to download or update the app.

Question: The video says that after you physically setup Vespera, it will use the GPS signal from your phone to gain geosynchronous alignment. If you do not have cellular service at a location where you are doing the setup, how does it align itself?

Vaonis: Vespera uses your smartphone or tablet's GPS (no need to have service for that). If your tablet is a Wi-Fi iPad, for example, that does not have GPS, you can enter the location manually in the app. To summarize, no need to have a signal or service to use Vespera or Stellina. You only need that (or Wi-Fi) to download or update the app.

Add-ons: Filters, Heating, Backpack, Tripod

Question: Does Vespera incorporate a light pollution filter?

Contrary to Stellina, Vespera will not integrate an anti-pollution filter. This will be offered as an accessory.

Question: Will we be able to add filters on Vespera?

Yes, it will be possible to add the full-aperture filters designed by Vaonis (50 mm): Solar (ND), CLS (light pollution), Hydrogen-Alpha, Oxygen-III, and Sulphur-II. You have just to clip the filters in front of the lens.

Question: Please provide additional details about the filters in the expert edition. What additional capability does this provide and may they be used in combination with the future light pollution filter?

In the expert edition, you will get a set of 4 filters:

When using an interferential filter, light pollution will be reduced at the same time. All these filters can be used where there is light pollution and reveal even more details. Concerning galaxies, since they are made of stars and nebulae, it can also work out, but the number of targets will be more limited due to the weak signal.

Question: Can we use any other manufacturer's filter on Vespera?

No it will not be possible to use existing filters, as Vespera will adapt its image processing and object suggestions, based on filters that will be used, by detecting the type of filter. Moreover, a full-aperture filter involves specific requirements in term of optical quality that are not guaranteed by most of the filters in the market.​​​​​​​​

Questions: Will Vespera incorporate a heating resistance system? If not, where will it fit?

Unlike Stellina, Vespera will not incorporate an anti-dew heating resistor. This will be offered as an accessory. The optional dew heater will fit in the front of the tube, near the first lens.

Question: Will Vespera come with a backpack?

The backpack is included in the Vespera's Adventurer Edition pledges. It will also be available as an optional accessory purchase on the Vaonis Website.

Question: I already own the tall tripod for my full-size Stellina. Will that tripod work on Vespera?

Yes, this is a standard universal size, so it will also fit Vespera (3/8" screw).




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