In order for the eShel to measure the target light source flow, also known as flux accordingly, the fiber injection and guiding unit must be used so the photons enter the 50 μm optical fiber. In conjuction with an autoguider camera (sold separately) that can center the object in the field of view. Another benefit it serves is connecting the lights from the calibration unit with a 200 μm optical fibre with a switch available to alter from one source to another.

• f/6 telescope input is the standard configuration. Possibility to add the F/7.8 and F/9 configuration
• Chromium mirror with 50µm hole
• Object FC connector
• Calibration FC connector
• Mirror switch to bring calibration light into object fibre
• Connection with guiding camera : C mount
• Operating temperature of the guiding unit : -25° C to +30° C
• Guiding and injection unit storage : -30° C to +40° C
• 2 inch nosepiece & T-mount thread

• M42 T adapter telescope interface
• Backfocus ~45mm
• Miror with light going through a 50µm hole for the f/6 standard version
• Calibration fiber input (remote controlled mirror position)
• Fiber object 50 µm, 5, 10 or 20 meters length
• Calibration fiber 200 µm, 10 or 20 meters length
• Fibers protected by metal/plastic casing
• FC fiber connectors
• C-mount for guiding camera (sold separately)

Photos below show the autoguiding of a star with the 50 µm fibre.