What is the RB Focus eXcalibur 4.0 Motorized Flat Panel?
The eXcalibur 4.0 is a 2-in-1 device that serves as both a high-quality flat field illumination panel and a motorized, automated dust cover for your telescope. It allows you to remotely cover your optics and take calibration flat frames without being physically present at the telescope.
How do I control the RB Focus eXcalibur 4.0?
Wirelessly over Wi-Fi, from ASCOM Alpaca compatible software such as N.I.N.A., without a USB cable to the capture computer. You can also open its built-in web interface from a browser on a computer, tablet or iPad to open or close the panel and set the brightness.
I use N.I.N.A. with LRGB and narrowband filters. How does the eXcalibur 4.0 handle different filter factors?
The eXcalibur 4.0's deep integration with N.I.N.A. allows for dynamic brightness adjustment. You can pre-configure a specific brightness level (from 0 to 4095) for each filter in your sequence. When the N.I.N.A. sequencer moves to capture flats for your Ha filter, for example, it will automatically command the panel to the exact brightness you defined for that filter, so each filter gets the brightness you set.
What size eXcalibur 4.0 should I order?
Each variant is the diameter of the dew shield or telescope opening the panel is made for, from 80 mm to 460 mm. Measure your dew shield or tube opening and choose the matching size; ask us if you are unsure.
What kind of light source does the eXcalibur 4.0 panel use?
A neon LED panel calibrated to the spectrum of sunlight, which RB Focus says gives natural, even illumination for flat frames.
Do I need a separate dew heater for the eXcalibur 4.0 panel itself?
No. The eXcalibur 4.0 has a built-in heater that helps prevent dew and keeps the panel working through long sessions.
How is the eXcalibur 4.0 powered?
It runs on 12V. Its connections are a 2.1 mm center-positive DC jack and a USB-C port.
Does the weight of the eXcalibur 4.0 change with the panel size?
Yes. RB Focus gives 186 g and says the weight varies with the size of the flat field panel ordered.
Can I use the eXcalibur 4.0 with software other than N.I.N.A.?
It works with applications that support ASCOM Alpaca over the network. RB Focus names N.I.N.A.; check that your program supports Alpaca cover calibrator devices.
Is the RB Focus eXcalibur 4.0 difficult to install on a telescope?
The eXcalibur 4.0 features a simplified mounting system designed for easy installation and removal. Since each unit is made to order based on your telescope's diameter, it provides a secure fit without complex adjustments.
