From: "Willem-Jan Markerink" To: Ruth Thompson Date sent: Sun, 2 Apr 2000 22:40:00 +0100 Subject: Shark eyes (was: ???????Question?????? Copies to: infrared@a1.nl Send reply to: infrared@a1.nl On 2 Apr 00 at 13:27, Ruth Thompson wrote: > You invited questions or comments of any kind on your webpage so as > weird as my question is > I'll take you up on your offer and ask this: > > My friend has a pair of those cheap low grade night vision binoculars. > After playing around with them for a bit there's something that I just > can't grasp when it comes to how they function and I hope you can > explain it to me, I'd really appreciate it. Here's what happened. I > was viewing my friend and his dog, he was a bit fuzzy looking but I had > a difficult time seeing his eyes. I was able to see his dogs image as > being very crisp no glow around him and his eyes were dark until he came > > close to me then they glowed bright white. I had my friend take the > camera and look at me with the dog. He became very nervious and said my > eyes were also glowing a bright white. What I don't understand is why > through night vision was my friend able to see white from my eyes and > I wasn't able to see any color when looking at his eyes. Not sure how to explain the difference, but the eiry white glow of eyes is also common with infrared photography, and called 'shark eyes'. So don't start the exorcism yet, and don't kill the dog!....;-)))) Your friend didn't wear contact-lenses, did he? (possibly IR-proof plastic) If you want to explore this topic indepth, I recommend you subscribe to the Infrared Photography Mailinglist.... (CC'd to the list already, maybe someone has noticed this eye-diversity before) -- Bye, Willem-Jan Markerink The desire to understand is sometimes far less intelligent than the inability to understand [note: 'a-one' & 'en-el'!] From: "Charles Andrew" To: Subject: Re: Shark eyes (was: ???????Question?????? Date sent: Sun, 2 Apr 2000 18:16:03 -0400 Send reply to: infrared@a1.nl If nothing like the IR contacts is found then your friend should see an eye doctor. The lens of the eye most likely changes specral characteristics and perhaps the vitreous humor does, as well. It would be nice to have found a non-invasive way to find some pre-clinical disease like glaucoma, age-related macular degeneration and so on. Anything that is so obvious must be taken seriously. (Optometery is the profession of testing the refractive power and visual range of the eye.) Date sent: Mon, 03 Apr 2000 17:04:24 +1000 To: infrared@a1.nl From: Ben Kreunen Subject: Re: Shark eyes (was: ???????Question?????? Send reply to: infrared@a1.nl At 10:40 PM 4/2/00 +0100, you wrote: >On 2 Apr 00 at 13:27, Ruth Thompson wrote: > > > You invited questions or comments of any kind on your webpage so as > > weird as my question is > > I'll take you up on your offer and ask this: > > > > My friend has a pair of those cheap low grade night vision binoculars. > > After playing around with them for a bit there's something that I just > > can't grasp when it comes to how they function and I hope you can > > explain it to me, I'd really appreciate it. Here's what happened. I > > was viewing my friend and his dog, he was a bit fuzzy looking but I had a > > difficult time seeing his eyes. I was able to see his dogs image as being > > very crisp no glow around him and his eyes were dark until he came > > > > close to me then they glowed bright white. I had my friend take the > > camera and look at me with the dog. He became very nervious and said my > > eyes were also glowing a bright white. What I don't understand is why > > through night vision was my friend able to see white from my eyes and I > > wasn't able to see any color when looking at his eyes. Take a note of where the light(s) was(were). The effect you see is nothing more than light from the same direction as the camera reflecting off the back of the eye and into the lens, but because it's really dark you don't pay much attention to where it's coming from. It also only works because your pupils are dilated in the dark, so there may be other reasons as to why your friends eyes were not dilated ;-) Cheers Ben ======================================================= Gallery and Photography Tips (including IR) http://www.bigbenpublishing.com.au/gallery/photography/ ======================================================= From: "Jon Witsell" To: infrared@a1.nl Subject: Shark eyes and step-up ring question Date sent: Sun, 02 Apr 2000 21:08:32 PDT Send reply to: infrared@a1.nl Hi, Can't explain the difference either... but I just purchased a Sony TRV8 camcorder and with the digital effect "Negative Art" and the IR "Nightshot" function turned on, I shot some pretty demonic footage of myself. Not only did my eyes glow, but so did the inside of my nose and mouth--and my goatee and eyebrows! Very strange indeed. Question: I got this camcorder partly to use as a IR preview device so I would like to attach my 52mm 87c filter to it. However, the camera's filter ring is 30mm and I haven't been able to find a 30mm to 52mm step-up ring. I would use two rings if necessary. Any suggestions? Jon