Quote:
Originally Posted by Aussie Bloke
...I see a 3 inch IO fitted with a night vision apparatus similar to the one in your photo except it's a lot longer...
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The long one looks like two stages of intensification to me.
Note: Photocathodes typically have a peak quantum efficiency of 10%, often in the visible/blue region, but some were developed for near infrared. CCDs may have a peak approaching 100%, typically in the infrared.