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TheLion
2004-Aug-04, 10:35 PM
Just a quick question: could aura photography possibly be explained by spherical aberration?

kmarinas86
2004-Aug-04, 10:53 PM
http://www.google.com/search?q=%22what+is+aura+photography%22

http://www.google.com/search?q=%22what+is+spherical+aberration%22&spell= 1

Kesh
2004-Aug-04, 11:56 PM
Just a quick question: could aura photography possibly be explained by spherical aberration?

It's possible but, if that were the case, it should be apparent in any photograph taken with that lens. So, it seems very unlikely.

The most rational explanation is a simple error during film processing. While I believe it's possible that auras themselves could be real, there's nothing special about everyday film that would pick up something like that.

As a side-note, I'm not sure what this has to do with astronomy.

01101001
2004-Aug-05, 12:36 AM
http://www.google.com/search?q=%22what+is+aura+photography%22
How about a nice, respectable CSICOP article (http://www.csicop.org/si/2000-05/i-files.html)?

According to that, the patented Aura Camera includes within it an LCD screen that is displaying some computer-munged representation of the subject's galvanic skin response. I like how the author went back for a second photo, thought about romance, which was supposed to color his aura red, and it came out a cool blue.

For the techies, the patent is here (http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=2&f=G&l=50&co1=AND&d=ptxt&s1=coggins&s 2=aura&OS=coggins+AND+aura&RS=coggins+AND+aura). From a quick read of that, I didn't get that the camera includes an LCD display of the "aura", rather that the camera simply digitizes an image of the subject and then the computer adds the smeared, colored aura based on input from galvanic skin response sensors, and prints the amalgamated image.

Gullible Jones
2004-Aug-05, 12:59 AM
Look at the entry on www.skepdic.com about Kirlian photography.

TheLion
2004-Aug-05, 05:05 AM
As a side-note, I'm not sure what this has to do with astronomy.

Is there an astronomer out there that is NOT familiar with spherical aberration? Because I'd like to find out where he (or she, let's not be sexist now) is getting his/her mirrors that are always 100% parabolic.


How about a nice, respectable CSICOP article?

Thanks for the link. From what I read, their method doesn't sound terribly scientific, though. But what I meant was with a normal, optical camera, is it possible for there to be an "aura" surrounding someone (especially in a well-lit room against a solid background)?

01101001
2004-Aug-05, 05:46 AM
But what I meant was with a normal, optical camera, is it possible for there to be an "aura" surrounding someone (especially in a well-lit room against a solid background)?
Oh, sorry. "Aura" can mean so many different things. Mostly I was trying to address some of those example psychic-faire-type pseudo-aura photos that came up with the Google search suggested by kmarinas86.

It's a little clearer what you're after, but do you have an example to show us? Is there something you've seen on the Web?

From examples I've seen, if a camera and its lens do exhibit some chromatic aberration, the effect, especially near sharp edges, might be considered to be aura-like. But, I don't know if that's what you're talking about.

TheLion
2004-Aug-05, 06:11 AM
Sorry, my fault. I should've made it clear in the first place. I've got a picture here that I took a while back that I'll scan and upload tomorrow. The odd thing about it, though, is that the aberration is in the center, not toward the edges, which is part of the reason I asked in the first place.

Kesh
2004-Aug-05, 09:31 PM
As a side-note, I'm not sure what this has to do with astronomy.

Is there an astronomer out there that is NOT familiar with spherical aberration? Because I'd like to find out where he (or she, let's not be sexist now) is getting his/her mirrors that are always 100% parabolic.


I was referring to aura photography. Which has zero to do with astronomy.