DSLRUsers.com

Posted: **Sat Nov 17, 2007 7:45 am**

What and where?

Posted: **Sat Nov 17, 2007 9:09 am**

ice on textured glass?
i dunno

Posted: **Sat Nov 17, 2007 9:27 am**

Maybe a small piece of quartz on a vinyl tile? It's a tricky one.

Bob

Posted: **Sat Nov 17, 2007 11:09 am**

iceberg floating in the ocean

Posted: **Sat Nov 17, 2007 1:16 pm**

Hail on the road?

Posted: **Sat Nov 17, 2007 1:39 pm**

A grain of sand sitting on a painted surface.

Posted: **Sat Nov 17, 2007 3:59 pm**

The substrate seems to have a crystalline structure. Possibly hexagonal. It is also apparently flat in the larger context. I am thinking some form of coating on a larger surface, but grown rather than sprayed on.

There appears to be fluid on the substrate surface in the shadow of the white object, and there appear to be bubbles within it, so I am thinking the ice guess is good.

So my guess would be an ice grain in a non stick frypan.

Posted: **Sat Nov 17, 2007 5:20 pm**

Geoff wrote:Hail on the road?

Read my mind

Posted: **Sat Nov 17, 2007 5:24 pm**

Ver narrow depth of field , high macro? From Abu Dhabi so grain of quartz might be right on oil substrate. It would be appropriate.

Posted: **Sat Nov 17, 2007 8:23 pm**

Salt on Salt.

Posted: **Sat Nov 17, 2007 8:29 pm**

Hmmm close .... but still very far. Keep guessing!

Posted: **Sat Nov 17, 2007 9:01 pm**

Its a list of all the good ideas Kevin Rudd's economic plan has, sitting on his desk, captured with a spectrometer?

Posted: **Sat Nov 17, 2007 9:19 pm**

Sugar on cutting board?

Posted: **Sun Nov 18, 2007 1:54 am**

Oz_Beachside wrote:Its a list of all the good ideas Kevin Rudd's economic plan has, sitting on his desk, captured with a spectrometer?

I don't live in Australia (not that I don't want to!) and hence my knowledge of Australia's politics is very limited.

Posted: **Sun Nov 18, 2007 2:22 am**

Grain of salt on leather ??

Posted: **Sun Nov 18, 2007 3:18 am**

Hail stone on a wet car bonnet? looks like water beading on a metal panel...

Posted: **Sun Nov 18, 2007 8:39 am**

kamran wrote:
Oz_Beachside wrote:Its a list of all the good ideas Kevin Rudd's economic plan has, sitting on his desk, captured with a spectrometer?

I don't live in Australia (not that I don't want to!) and hence my knowledge of Australia's politics is very limited.

Likewise our (so-called) political leaders.

Posted: **Sun Nov 18, 2007 9:01 am**

Posted: **Sun Nov 18, 2007 9:31 am**

No way! would never have picked it!

Posted: **Sun Nov 18, 2007 9:34 am**

I would never have thought of the floppy disk. That was fun Kamran.

Posted: **Sun Nov 18, 2007 11:47 am**

a fun challenge to watch, well done!

Posted: **Sun Nov 18, 2007 12:12 pm**

very interesting view of the world...

can you tell me, (since I have never tried macro), is this somehting that can be done with a 105mm, or do you need extra layers of glass to get this close, and detailed?

Posted: **Sun Nov 18, 2007 12:21 pm**

Of course..I can't believe I didn't figure it out?!?! :lol:

Posted: **Sun Nov 18, 2007 1:34 pm**

Very interesting!

Of course, a floppy disk is about as useful as one grain of salt ! :lol:

Posted: **Sun Nov 18, 2007 6:04 pm**

That was an interesting little challenge. Some people were very close.

Bob

Posted: **Sun Nov 18, 2007 8:58 pm**

Thanks for your comments. Some technical data below:

Lenses = Micro Nikkor 105mm 2.8D + Nikkor 50mm 1.8D (reversed)
Focal Length = ??
Aperture = f/40 (on 105mm) & f/1.8 (on 50mm)
Shutter Speed = 1/60 sec.
ISO Rating = 100
Magnification ratio = About 3:1
Flash = Nikon SB800 in wireless mode (bounced from a white cardboard)

Achieving such a high magnification ratio does require a custom setup. I don't think there are lenses that can focus to more than 2:1 on their own. I will post details of the setup (with some pictures) later when I get time.

Cheers,
Kamran