5 ms·
As others have stated, there’s no lens for focusing. What is however kind of surprising to me is the amount of hot pixels and also dust / debris on the sensors
by jsjohnst 6y ago
As others have stated, there’s no lens for focusing.
What is however kind of surprising to me is the amount of hot pixels and also dust / debris on the sensors. You’d think that as expensive and fragile as they claim the sensor array is, they’d keep the environment cleaner. Example: https://www.dropbox.com/s/rhldlwyqzuvbf2o/2020-09-13%2007.36.16.jpg?dl=0 https://www.dropbox.com/s/rhldlwyqzuvbf2o/2020-09-13%2007.36...
I also question the “five human hairs” wide gap between the sensor pods given that the gaps are clearly visible in the press photos of the sensor array.
- nitrogen 6y agoSingle human hairs can also be visible in photos.
- jsjohnst 6y ago> Single human hairs can also be visible in photos. Not at the distance and resolution of a photo like this one: https://www6.slac.stanford.edu/sites/www6.slac.stanford.edu/files/lsstcam-focalplane-lowres.jpg https://www6.slac.stanford.edu/sites/www6.slac.stanford.edu/... See the orangish lines between the sensors.
- nitrogen 6y agoThose are pretty clear, though if they are significantly brighter than the sensors they would still be visible at a very fine width.
- slac_er 6y agoThose are cosmic rays
- slac_er 6y agoNone of the debris is on the sensors. There is some small amount of dust on a window, and it shows up twice as much due due to image processing performing bias subtraction. The sensors are in a cryostat, and the effective size you of what you might thing as “dust” in these pictures would be quite large if they had been on the sensors (several mm)