James Webb Telescope's fine guidance sensor provides us with first real test image James Webb

7 big questions the James Webb Space Telescope is about to answer

Sir John Herschel used a solar wedge attached to his telescope to observe the Sun in the mid 19th century. A solar wedge reflects 4.5% of sunlight towards the eyepiece and a second glass filter reduces the Sun's white light by a factor of 1,000 or more

Webb’s Fine Guidance Sensor Provides a Preview - Gaze at this test image - an unexpected & deep view of the universe - captured by Webb’s Fine Guidance Sensor (FGS) in May