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I like the fact the mission time is 5.5years (hopefully 10 years), the .5 years for calibration and collimation and 5 years for science.
The current star being used to calibrate and collimate etc will be too bright for use once the scope is setup and full operational.
The main mirror is 6.5mtrs, the focal length is 131.4mtrs (F20) but its irrelevant as the images will be translated from infrared to visual.
NASA FAQ:
"Webb images will be infrared, this can be translated by computer into a visible picture (just like we have done with Spitzer, which has produced beautiful pictures as well). Additionally Webb can see orange and red visible light."
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