Jan 21, 2009: Digital Weird - Page 2

Gravdigr · 01-21-2009, 10:43 PM

Quote:

Originally Posted by Wombat

Nose cones don't cover the propeller blades. The blades come out the side of the nose cone. Which makes the photo plausibly real, not photoshopped.

Here are some pics of stationary propellers so you can see how the blades come out the side of the nose cone:

So it (the camera)manufactured parts of the prop that don't even exist?

Wombat · 01-21-2009, 11:36 PM

Quote:

Originally Posted by Gravdigr

So it (the camera)manufactured parts of the prop that don't even exist?

I can't see any parts of the prop that don't exist, so I'm not sure what you are referring to. To me, every part of the picture looks consistent with a focal-plane shutter exposure of a moving object. Yes it is weird, but I think it's genuine

xoxoxoBruce · 01-21-2009, 11:58 PM

But how do you get a continuous blade, with two red tips, and no red nose cone in the middle?

Razzmatazz13 · 01-22-2009, 12:44 AM

Quote:

Originally Posted by Sundae Girl

Ooh, ooh! I want one of those, do you know where they sell them?

Actually...the last time I was camera shopping, they had cameras that claim to fix blotches on your face automatically (after auto finding your face in the frame of course) and other such craziness.

This one makes you skinnier:
http://www.reginalewis.com/2007/09/1...ounds-thinner/

barefoot serpent · 01-22-2009, 12:17 PM

lots more examples here and discussions of photon gating and Nyquist frequencies etc.

barefoot serpent · 01-22-2009, 12:23 PM

another example

spudcon · 01-22-2009, 03:45 PM

Moving objects in the same speed/direction as the scanner on a copy machine makes the object look longer. :-)

Wombat · 01-22-2009, 03:59 PM

Quote:

Originally Posted by xoxoxoBruce

But how do you get a continuous blade, with two red tips, and no red nose cone in the middle?

Good question, lets see if we can work it out.

Looking at the pitch of the blades at the top-center of the picture (where there is least distortion), I think the propeller must be spinning clockwise as we look at it. That way the blades are pushing air towards the back of the plane.

If the shutter is a vertical slit that moves from right to left as we look at the picture, I think that explains the effect we see....

In the top-center of the picture, the blades and shutter pass in opposite directions when both are close to vertical, so we see straightish blades.

On the right of the picture, the tip of the blade passes the shutter first, then as the blade swings down through horizontal the shutter has moved slightly further left so we see the middle of the blade slightly further left than we saw the tip, and finally as the blade approaches the bottom of its swing the fast-moving blade tip overtakes the slower-moving shutter, and so we see the tip again slightly further to the left. The result: it looks like a double-tipped blade floating unattached in the air

I'll let you figure out what's happening on the left of the picture yourself

HungLikeJesus · 01-22-2009, 06:17 PM

I agree. If the shutter is moving left to right, the propeller has to be spinning clockwise (from our POV). Because you can see the root of the propeller in the top but not the bottom, the smallest relative velocity between the shutter and propeller must occur there - so they're moving in the same direction at the top and the opposite direction at the bottom.

Elspode · 01-22-2009, 06:29 PM

But...if the plane was on a treadmill, and the iPhone was trying to take off, would the propeller blades appear at all?

Griff · 01-22-2009, 07:06 PM

Depends. Is the treadmill on a train approaching the speed of light?

SPUCK · 01-23-2009, 03:19 AM

No! But the train did leave the station going west.

Gravdigr · 01-29-2009, 06:33 AM

Quote:

Originally Posted by Wombat

I can't see any parts of the prop that don't exist, so I'm not sure what you are referring to. To me, every part of the picture looks consistent with a focal-plane shutter exposure of a moving object. Yes it is weird, but I think it's genuine

I was talking more or less about the part of the prop that bolts to the hub. Where do the hub flanges disappear to, and where does the section of prop that magically appears to connect two seperate sections of prop where there should be hub flanges (for lack of the correct term) appear from?

And, to clarify, I'm not saying the pix are actually photoshopped. (I just thought the bs flag was cool) Just perpetuating the oft repeated cellar mantra. I've seen these type pix before, I just can't wrap my fragile little mind around the idea.

Anon. Y. Mouse · 10-03-2009, 03:42 PM

I believe you're seeing the reflection of the blades on the nose.

lumberjim · 10-03-2009, 09:00 PM

Anon E Mouse would have worked better

eta.....unless your 1st language es Espanol

01-21-2009, 11:58 PM	#18
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	But how do you get a continuous blade, with two red tips, and no red nose cone in the middle? __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

01-22-2009, 12:17 PM	#20
barefoot serpent go ahead, abbrev. it Join Date: Jun 2005 Location: Lawrence, KS Posts: 2,623	lots more examples here and discussions of photon gating and Nyquist frequencies etc. __________________ Chooses rowing vs. wading

01-22-2009, 12:23 PM	#21
barefoot serpent go ahead, abbrev. it Join Date: Jun 2005 Location: Lawrence, KS Posts: 2,623	another example Attached Images __________________ Chooses rowing vs. wading

01-22-2009, 03:45 PM	#22
spudcon Beware of potatoes Join Date: May 2007 Location: Upstate NY, USA Posts: 2,078	Moving objects in the same speed/direction as the scanner on a copy machine makes the object look longer. :-) __________________ "I believe that being despised by the despicable is as good as being admired by the admirable."

01-22-2009, 06:17 PM	#24
HungLikeJesus Only looks like a disaster tourist Join Date: Feb 2007 Location: above 7,000 feet Posts: 7,208	I agree. If the shutter is moving left to right, the propeller has to be spinning clockwise (from our POV). Because you can see the root of the propeller in the top but not the bottom, the smallest relative velocity between the shutter and propeller must occur there - so they're moving in the same direction at the top and the opposite direction at the bottom. __________________ Keep Your Bodies Off My Lawn SteveDallas's Random Thread Picker.

01-22-2009, 06:29 PM	#25
Elspode When Do I Get Virtual Unreality? Join Date: Dec 2002 Location: Raytown, Missouri Posts: 12,719	But...if the plane was on a treadmill, and the iPhone was trying to take off, would the propeller blades appear at all? __________________ "To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog

01-22-2009, 07:06 PM	#26
Griff still says videotape Join Date: Feb 2001 Posts: 26,813	Depends. Is the treadmill on a train approaching the speed of light? __________________ If you would only recognize that life is hard, things would be so much easier for you. - Louis D. Brandeis

01-23-2009, 03:19 AM	#27
SPUCK Professor Join Date: Oct 2006 Posts: 1,911	No! But the train did leave the station going west.

10-03-2009, 03:42 PM	#29
Anon. Y. Mouse Kinda New Member Join Date: Oct 2009 Posts: 1	I believe you're seeing the reflection of the blades on the nose.

10-03-2009, 09:00 PM	#30
lumberjim I can hear my ears Join Date: Oct 2003 Posts: 25,571	Anon E Mouse would have worked better eta.....unless your 1st language es Espanol __________________ This body holding me reminds me of my own mortality Embrace this moment, remember We are eternal, all this pain is an illusion ~MJKeenan

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