Same mirror, different eyes
Comparison of key specs of Hubble, Webb, and Roman space telescopes
Item
Hubble
James Webb
Roman
Mirror diameter
2.4m
6.5m
2.4m
Field of view characteristics
Narrow and precise
Narrow and very deep (infrared)
Wide and fast survey (100x of Hubble)
Main observation wavelength
Visible/Ultraviolet
Infrared
Visible to near-infrared
Location
Low Earth orbit
Sun-Earth L2
Sun-Earth L2
Main mission
Precision imaging
Early universe/galaxy formation
Dark energy/exoplanet survey
Even if the mirror size is the same, the camera sensor determines the field of view
Source: Compiled from NASA and NASA SVS (Far and Wide) data