2. digital
  3. 146362-45726

Machina Dynamica New Dark Matter CD and Blu Ray tray treatment?

This is a set of adhesive-backed thin plastic pieces that one attaches to one’s transport or player disc tray. The disk rests on them during non-spin mode, but presumably don’t touch the applied thin pieces during playback mode. The company says the new Dark Matter pieces reduces background scattered light from reaching the photodetector, thereby improving performance. 

Anyone tried this product? Please specify transport or player if you have and your impressions. 
128x128celander
stevecham
3,340 posts
 
CD diode lasers are about 780 nm which is in the infrared and is not visible. Our vision falls off greater than about 633 nm or so. Cheaper, more recently developed 405 nm diode lasers in the violet allowed development of blueray. DVD is 650 nm or visible red. The shorter the wavelength, the more data you can fit onto a disc because the features can be made smaller.
geoffkait's avatar
geoffkait
23,365 posts
 
That’s very good, stevecham. But why is the sky blue? If our vision falls off after 625 nm how can 650 nm be visible red? 

Pop quiz: what color is a Blu Ray laser?

part 2: what’s the complementary (absorbing) color for the Blu Ray laser scattered light? 
glupson
7,842 posts
 
"Pop quiz: what color is a Blu Ray laser?"

It depends on temperature of the environment and an individual’s perception of colors.


What is my prize?

geoffkait's avatar
geoffkait
23,365 posts
 
I totally get it. You’re tone deaf AND color blind. But you’re probably lucky in love. 🥰
glupson
7,842 posts
 

Color is your perception, not the absolute value. You also forgot that I may have problems with temperature sensitivity.


I am still waiting to find out what my prize for answering pop quiz correctly is.

More to discover