Pit density on CD and DVD

Gerd · Post by **Gerd** » Thu Jan 20, 2011 3:24 pm

Something technical this time....
DVD-ROM Pits on the left side, CD-ROM Pits on the right side of picture.
Both taken with a 100x Objective at incident lighting.
Magnification about 1300x at 300 DPI.
Thanks for looking,
Gerd

rjlittlefield · Post by **rjlittlefield** » Fri Jan 21, 2011 12:26 am

Really nice photographs, Gerd!

Considering how hard it is to image these things, it's amazing to me that they can be reliably read by a unit that costs less than $100 in a retail box, optics and electronics combined.

--Rik

g4lab · Post by **g4lab** » Sat Jan 22, 2011 1:57 pm

Very nice and revealing image!

Was there oil immersion? Were the specimens normal to the objective or at an angle?

Gerd · Post by **Gerd** » Mon Jan 31, 2011 3:47 pm

thanks Rik and g4lab.
The photomicrographs were taken with a dry 100x Objective.
These are objectives for material science for incident lighting.
And the specimen were in normal position, 90 degrees to the optical path.
Thank you,
Gerd

rjlittlefield · Post by **rjlittlefield** » Mon Jan 31, 2011 4:53 pm

Gerd wrote:These are objectives for material science for incident lighting.

To clarify...

Were these illuminated through the imaging lens, using "brightfield episcopic"?

Or around the side of the imaging lens, using "darkfield episcopic"?

--Rik

mu0chn · Post by **mu0chn** » Tue Feb 01, 2011 12:45 pm

Great shots.
The CD looks like morse code

Gerd · Post by **Gerd** » Thu Feb 03, 2011 12:29 pm

Rik, illumination was through the imaging lens,
this is a episcopic DIC illumination.
Thanks,
Gerd

Walter Piorkowski · Post by **Walter Piorkowski** » Fri Feb 04, 2011 5:47 pm

Gerd , I have enjoyed these images and the way you layed them out. I'm going to get my EPI DIC unit out and have a look for myself.
Walt

lauriek · Post by **lauriek** » Tue Feb 08, 2011 8:09 pm

Very nice, but, no blu-ray comparison?

Gerd · Post by **Gerd** » Sat Feb 12, 2011 11:19 am

Thanks, Laurie ! Yes blu-ray is in the pipeline,
but i still didn't find a cheap one to make a preparation...

Kind regards,

Gerd

Charles Krebs · Post by **Charles Krebs** » Sun Feb 13, 2011 12:05 pm

Superb!

Can you make them out at all without DIC?