If you use a flatfield unit in front of your telescope instead of the RCU, that unit should not have a green-blue emission gap. Why? For calibration of the ThAr spectrum, the calibration script of MIDAS scans the flatfield spectrum to recognize as much spectral orders as possible. Order detection could fail with a non-uniform flatfield illumination. That depeds on your given unit.
Also important is the brightness of the flat unit in front of the telescope. It must be very bright to provide the same intensity level at the slit as the RCU which directly illuminates the slit of BACHES.
Also, please consider remote control of the calibration unit. This can only be accomplished by the RCU which contains a LAN female connector for connection to your local network. A fixed IP address can be assigned. You are able to control the RCU with any web browser, the web interface is implemented in the RCU. The standard calibration set with ThAr lamp only can not be controlled remotely!
We recommend the RCU to you, because we are sure that you will like the additional features as compared to the standard unit.
Manufacturer Baader Planetarium SKU (#) 2458615
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