INDI Altair cameras Driver currently supports all of Altair Astro mono and color cameras.
Under Ubuntu, you can install the driver via:
sudo add-apt-repository ppa:mutlaqja/ppa
sudo apt-get update
sudo apt-get install indi-toupbase
The driver supports the standard single-frame capture mode in addition to video streaming when supportted. Furthermore, it supports:
- Guiding via ST4 port.
- Color and Mono cameras.
- 8, 10, 12, and 16 bit support. For 10 and 12bit cameras, the images are always stored using 16bit depth.
- Temperature control if cooler is available.
- Black and White balance adjustments.
- USB Speed control: This is important when the camera is used on ARM architectures like the Raspberry PI3.
- Gain, Brightness, Saturating, Gamma...etc controls.
Connecting to Altair Cameras
Simply connect the camera via USB to your PC or SBC (Single board computer). The camera can be connected to an external powered hub as well. You can connect multiple cameras
The camera is very sensitive to power fluctuations. Make sure to use a 3A power supply if the camera is connected to RPI3/StellarMate. The USB speed is automatically adjusted to lower values since USB bandwidth on RPI3 is limited and can cause the camera to indefnitely loop. If the camera gets stuck during exposure, change the cable, and check the power and USB speed settings.
This provides general information about the currently running driver and driver version. It also lets you set the Observer and Object Information for the FITS Header.
To capture a signle-frame image, simple set the desired exposure time in seconds and click Set. After the capture is complete, it should be downloaded as a FITS image. If the camera is equipped with a cooler, target temperature can be set. To change the format and bit depth (if supported), select a different image format in the Controls tab.
The Options tab contains settings for default file locations, upload behavior, and debugging. The polling period for this driver should be kept as is unless you need to reduce it for a specific reason.
- Debug: Toggle driver debug logging on/off
- Configuration: After changing driver settings, click Save to save the changes to the configuration file. The saved values should be used when starting the driver again in the future. The configuration file is saved to the user home directory under .indi directory in an XML file.(e.g. ~/.indi/camera_name.xml)
- Snoop Device: The camera driver can listen to properties defined in other drivers. This can be used to store the relevant information in the FITS header (like the mount's RA and DE coordinates). The respective drivers (Telescope, Focuser..etc) are usually set by the client, but can be set directly if desired.
- Rapid Guide: Rapid Guide uses internal algorithm to automataically select guide stars.
- Telescope: Toggle between Primary and Guide scope selection. This selection is required in order to calculate World-Coordinate-System (WCS) values like Field-Of-View (FOV). When WCS is enabled, the FITS header is populated with WCS keywords that enable clients to map the sources in the image to physical coordinates in the sky. Usually, you do not need to toggle this setting manually as it is usually set by the client automatically
- Upload: Selects how the captured image is saved/uploaded?
- Client: The image is uploaded the client (i.e. Ekos or SkyCharts)
- Local: The image is saved to local storage only.
- Both: The image is saved to local storage and also uploaded to the client.
- Upload Settings: Sets the local desired directory and prefix used to save the image when either the Local or Both upload modes are active. The IMAGE_XXX is automatically replaced by the image name where the XXX is the image counter (i.e. M42_005.fits). The driver scan the local storage and increments the counter automatically when a new image is captured and stored.
In the Image Settings tab, you can configure the framing and binning of the captured image:
- Frame: Set the desired Region-Of-Interest (ROI) by specifying the starting X and Y positions of the image and the desired width and height. It is recommended to set use even numbers only to enable binning if required. The ROI values are indenepdent of the binning used.
- Binning: Set the desired binning. The usually supported
Image compression can be turned on in image settings to compress FITS images. This might require more processing but can reduce the size of the image by up to 70%. The uploaded image would have an extenstion of .fits.fz and it can be viewed in multiple clients like KStars.
The Frame Type property is used to mark the frame type in the FITS header which is useful information for some processing applications. If there an electronic or mechanical shutter, the driver closes it automatically when taking dark frames.
To restore the ROI to the default values, click on the Reset button.
The image info tab contains information on the resolution of the CCD (Maximum Width & Height) in addition to the pixel size in microns. If the camera supports Bayer mask, then the bayer filter and offset can be set here. These are usually set automatically by the driver, but can be adjusted manually if needed.
The controls tab provides settings to adjust common camera parameters such as gain, gamma, brightness, contrast..etc.
A very important parameter is the Speed setting. Setting it to maximum will fully utlize the USB bandwidth available on the device and will deliver images faster, but this is problematic on small embedded device like Raspberry PI. For such devices, the USB speed default to 0. You may expeiment with adjusting it until you achieve a good balance between performance and stability.
The Auto switches enable to automatically calibrate exposure and while/black balance using the camera own internal algorithms. For astronomy, it is usually recommended to set all controls manually to achieve the most level of control over the produced images.
Some cameras support higher bit depth rates such as 10, 12, and 14bits. However, the generated FITS file is either 8bit or 16bit, so any intermediate bit depths are automatically stored as 16bit.
The image resolution can be directly selected here, though it is prefreable to set the ROI in the Image Settings tab.
Due to USB bandwidth limitations, the camera exposure can fail with Exposure Timeout messages. One way to resolve this issue is by reducing the resolution.
Control the maximum and minimum ranges for all color channels. The RGB black levels can also be adjusted. By default, all levels are set to the maximum data range (0-255).
Display the camera firmware information.
There are no known bugs for this driver. If you found a bug, please report it at INDI's
bug tracking system
at SourceForge. (You can log in with a variety of existing accounts, including Google, Yahoo and OpenID.)