{"product":{"product_id":"0471122092","title":"Infrared Detectors and Systems","price":"198.87","image_url":"https://m.media-amazon.com/images/I/51VYqpn10OL._SL500_.jpg","url":"https://www.amazon.com/dp/0471122092"},"comments":[{"body":"Hi! Thanks for the response! When you say lens area, are you referring to the aperture size?\r\n\r\nDereniak and Boreman - that's not a book I'm familiar with - is it [this one](http://www.amazon.com/dp/0471122092)? Is it a good resource on radiometry?\r\n\r\nI will PM you my e-mail - seeing some problems worked through would be super helpful.","subreddit_name":"Optics","author":"uoficowboy"}]}