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Mystery Photos from TDU

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LAN_403

Tesladownunder

Sat Jun 03 2006, 04:38PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Yeah, too easy.

Pic shows standard lighting of the UV marble and the bubble imperfections.

Next Mystery photo should be easy too. Estimate the altitude it was taken at as well.

Peter

Sat Jun 03 2006, 05:18PM

Registered Member #85 Joined: Thu Feb 09 2006, 01:22PM
Location:
Posts: 21

I would guess that photo was taken from about a meter over your swimming pool after pouring some LN2 into it :)

Tesladownunder

Sun Jun 04 2006, 12:46AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

I suspect the smart punters are looking at my web site (or have Google Earth and can see my pool).

Yes it is LN2 taken from the stated altitude.
Complete pic below.

I have actually put virtually all of my best photos on my site (640 of them) and/or on 4HV.

Next mystery photo.

Electroholic

Sun Jun 04 2006, 02:00AM

Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720

Ha, I remember this one. The failed defibrillator cap, right?

Bored Chemist

Sun Jun 04 2006, 08:45AM

Registered Member #193 Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022

"There is no sparking since pure deionised water is an insulator"
No, it's not.
It's a poor conductor but a conductor nevertheless. It would be a real pity if someone were to get electrocuted because they relied on water as an insulator.
Interesting set of pictures though. My guess at the first one would have been a wire electrode sealed through glass like the anode of a rectifier tube (and I'd have been hopelessly wrong).

Dr. Shark

Sun Jun 04 2006, 10:17AM

Registered Member #75 Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711

BjÃ¸rn BÃ¦verfjord wrote ...

I have seen water do the stragest things, especially on small scales so I would not be too surprised. What is causing the doughnut reflections, a lamp?

Nope, thats what photographers call "bad bokeh" and comes from a point-shaped out-of-focus lightsource, that is imaged with overcorrected spherical aberration. The effect is especially pronounced with mirror lenses, but to a lesser extend with any other lens.

Bjørn

Sun Jun 04 2006, 11:19AM

Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058

I have several lenses and none of them have a bokeh remotely similar to that.

It seems to me that the picture is taken with a normal AF-S Nikkor 18-70mm lens and I have never been able to get any doughnuts from it. Did you use that lens Peter?

Tesladownunder

Sun Jun 04 2006, 12:19PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Bored Chemist wrote ...

"There is no sparking since pure deionised water is an insulator"
No, it's not. It's a poor conductor but a conductor nevertheless. ...

It has a higher breakdown than air in the current situation so effectively it is a pretty good insulator. I hope to do more experiments later.

BjÃ¸rn BÃ¦verfjord wrote ...

I have several lenses and none of them have a bokeh remotely similar to that.
It seems to me that the picture is taken with a normal AF-S Nikkor 18-70mm lens and I have never been able to get any doughnuts from it. Did you use that lens Peter?

Yes, I use the standard AF-S Nikkor 18-70mm lens. Hoped to get a new one but don't think my accountant would agree.
In fact I hadn't looked closely at the photo until now and didn't notice the circular light reflections which I have not seen before. I wondered if it might have been a reflection of the magnet just below the surface which is just out of view in front. I've not seen it before. The Nikon flash is a short linear lamp.

Electroholic wrote ...

Ha, I remember this one. The failed defibrillator cap, right?

Correct. I thought people would forget. It is actually one of my better shots to capture sparks in a dynamic shot.

OK Next Mystery photo is one is not one of mine but is a remarkable photo.

Peter

the_anomaly

Sun Jun 04 2006, 12:43PM

Registered Member #19 Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168

A giant mutant space ship com to get us!

Was it taken on a microscopic level? Looks like some kind of virus cell.

Bjørn

Sun Jun 04 2006, 12:46PM

Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058

My guess is a nuclear detonation, it seems to radiate light. It looks most peculiar.

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