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Reverse Engineering a Photo
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Jan 24, 2015 12:52:32   #
Graham Smith Loc: Cambridgeshire UK
 
Nightski wrote:
Graham Smith tried to make me feel better by editing it. LOL So I suppose he left his metadata on it.


It's in the file name :-D

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Jan 24, 2015 12:52:58   #
Nightski
 
LundyD43 wrote:
At f/32, I'm sure diffraction was a factor - maybe the most significant one - in blurring the tiny ice crystals. Also, with a six second exposure, there's a good chance SOMETHING moved, even with a good tripod. So my guess is a combination of diffraction and either tiny camera or subject movement.


Something did move ... it would be interesting to see how much diffraction entered in if it hadn't moved .. but why? I was out there shooting the same thing for three days in -10F weather and kept coming up with the same thing. I just couldn't figure it out because I had shot some ice the week before and the crystals were tack sharp. I just didn't like the compostion as well as I did with this one.

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Jan 24, 2015 12:53:33   #
Nightski
 
Graham Smith wrote:
It's in the file name :-D


I'm sorry Graham .. I hope I didn't embarrass you.

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Jan 24, 2015 12:54:00   #
birdpix Loc: South East Pennsylvania
 
Was the ice itself moving?

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Jan 24, 2015 12:54:09   #
Nightski
 
SonnyE wrote:
OK, my guess would be you got "Sonnyitus". :shock:

One of the tell-tale signs is the picture comes out wrong, but the reason is very elusive. ;)
I'd say you were shivering.


I was shivering .. but I wasn't touching my camera set up.

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Jan 24, 2015 12:55:04   #
Nightski
 
birdpix wrote:
Was the ice itself moving?


I did ask myself that, but then I figured out what I did.

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Jan 24, 2015 12:55:43   #
Terrym9 Loc: Hillsboro, Oregon
 
Nightski wrote:
I think it's very helpful to reverse engineer photos. What I mean by this is that I look an at image and try to figure out what caused the flaw(s).

I recently took an image that is OOF. It took me the longest time to figure out why. Was I lacking DOF, was my focus was in the wrong place, or was there was camera movement, was it diffraction, or was it because I just didn't have the crisp look I wanted because of the mist rising off the water. Or ... was it something else???

Focal length 100mm
F/32
6 second exposure

Go ahead and guess. Feel free to ask me questions about how I took the image. And please ... feel free to post an image that has a flaw!

I think this could be a fun game, a good exercise, and a learning experience for all.
I think it's very helpful to i reverse engineer /... (show quote)


Was it on a tripod with vibration reduction still on? such as the picture I am attaching


(Download)

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Jan 24, 2015 12:55:56   #
Graham Smith Loc: Cambridgeshire UK
 
Nightski wrote:
I'm sorry Graham .. I hope I didn't embarrass you.


Me embarrassed? You will have to try a lot harder if you want to do that :lol:

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Jan 24, 2015 12:56:24   #
Dngallagher Loc: Wilmington De.
 
Nightski wrote:
I think it's very helpful to reverse engineer photos. What I mean by this is that I look an at image and try to figure out what caused the flaw(s).

I recently took an image that is OOF. It took me the longest time to figure out why. Was I lacking DOF, was my focus was in the wrong place, or was there was camera movement, was it diffraction, or was it because I just didn't have the crisp look I wanted because of the mist rising off the water. Or ... was it something else???

Focal length 100mm
F/32
6 second exposure

Go ahead and guess. Feel free to ask me questions about how I took the image. And please ... feel free to post an image that has a flaw!

I think this could be a fun game, a good exercise, and a learning experience for all.
I think it's very helpful to i reverse engineer /... (show quote)


Right off, I would say you should not have used f/32 - you don't get as sharp an image using f/32, but you do get defraction.

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Jan 24, 2015 12:56:44   #
johnmowry Loc: Northern Indiana, USA
 
Interesting concept for a thread. At first I thought it was camera motion, but then I noticed a faint geometric (mostly rectangular) pattern in the undetailed areas. Maybe you left the pixels in the developer too long?
John

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Jan 24, 2015 12:57:34   #
birdpix Loc: South East Pennsylvania
 
Did you have image stabilization turned on?

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Jan 24, 2015 12:58:11   #
Nightski
 
Would you like another clue? :-D

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Jan 24, 2015 12:58:44   #
Nightski
 
birdpix wrote:
Did you have image stabilization turned on?


You guessed it!! Yay birdpix!! good one! :-D

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Jan 24, 2015 12:58:52   #
birdpix Loc: South East Pennsylvania
 
Nightski wrote:
Would you like another clue? :-D


alright.

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Jan 24, 2015 13:01:12   #
Nightski
 
Terrym9 wrote:
Was it on a tripod with vibration reduction still on? such as the picture I am attaching


Yes Terry .. very good. Isn't that maddening! I did about five forehead palms when it came to me what I was doing. The ice had the perfect form that day. I had been playing with it for weeks. It has to be cold enough to get those nice crystals. Oh I was mad!

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