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Author Topic: what happened here????  (Read 1173 times)

astrobeck

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what happened here????
« on: September 05, 2011, 01:57:04 AM »
a pinhole photo is below that I am kinda stumped with.

I'm not sure how the little "airy discs" were captured on the photo.
I'm used to seeing these when collimating a telescope and the focus is racked out while looking at a star.
But I'm not used to seeing them appear on my pinhole shots.
I sorta like them, and I'd like to figure out a way to duplicate this effect, but am not really certain how I managed it in the first place.

Happy accident, yes!  But if anyone has a reason/explanation on how it occurred, I have my extra large ears on because I'm completely at a loss.

Made with a Crown Graphic...the bellows don't leak because I just made another shot and it was void of the little circular ghosts sprinkled about.
« Last Edit: September 05, 2011, 02:00:12 AM by astrobeck »
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Suzi Livingstone

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Re: what happened here????
« Reply #1 on: September 05, 2011, 09:27:53 AM »
Faeries.
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Steven.

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Re: what happened here????
« Reply #2 on: September 05, 2011, 09:32:17 AM »
fairies huh? come here to san francisco we have a section of the city full of them  ;D
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Pete_R

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Re: what happened here????
« Reply #3 on: September 05, 2011, 09:46:09 AM »
Is it possible you were using a zone plate rather than a pinhole? The concentric rings look very much like one.
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Karl

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Re: what happened here????
« Reply #4 on: September 05, 2011, 11:49:29 AM »
lovely pic, good luck replicating it! I'm afraid I'm of no help here.
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astrobeck

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Re: what happened here????
« Reply #5 on: September 05, 2011, 01:42:05 PM »
Quote from: Peter R on September 05, 2011, 09:46:09 AM
Is it possible you were using a zone plate rather than a pinhole? The concentric rings look very much like one.

Peter, I thought that too, but it was one of my hand drilled pinholes, so it's very round and has no burrs around the edges...
I'm very stumped.
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Francois

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Re: what happened here????
« Reply #6 on: September 05, 2011, 03:59:41 PM »
Could it be flare reflecting from the sides of the hole?
Drilled holes are essentially photon tunnels...
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Francois

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astrobeck

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Re: what happened here????
« Reply #7 on: September 05, 2011, 04:11:32 PM »
Francois, it's possible, but I still don't get the circles?
I use very thin brass shimstock for drilling the holes, to avoid the tunnel factor...but who knows?
It's  a mystery to me.
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Britt Aximon

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Re: what happened here????
« Reply #8 on: September 05, 2011, 07:08:15 PM »
That is a great photo, no matter what happend! :D
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Mike (happyforest)

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Re: what happened here????
« Reply #9 on: September 05, 2011, 07:31:10 PM »
Could it be a form of bokeh, with highlights causing the repeated pattern of your pinhole?
Maybe with a bit of diffraction thrown in, giving it the zone plate type effect Peter mentioned.

This image shows something similar, with the blades of the aperture forming the image.

http://www.diyphotography.net/files/images/regular-bokeh.jpg

Mike

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