khunpapa

khunpapa

Lives in Thailand Bangkok, Thailand
Works as a Human Repair
Joined on Sep 23, 2011

Comments

Total: 2, showing: 1 – 2
In reply to:

Lensjoy: The human eye is most sensitive to green. When calculating luminance (Y) from the respective RGB values for gamma 2.2, the formula is:
Y = 0.2126*R^2.2 + 0.7152*G^2.2 + 0.0724*B^2.2
Blue is only 7 percent of perceived luminance! So if I were to design a sensor doing what Sigma is purporting to do, I would put the high resolution four pixels in the center green layer, not the top blue layer.

Perhaps Sigma is doing something more complex than the schematic in the article above implies, but from the above description I expect this sensor design to have faults that we'll see remedied in a future version. I wouldn't buy the camera yet.

We have to go back to Physic 101 classroom <grin>

Photon can be both wave and particle _at the same time_.

The three layers sensor is doped with different elements. The final result is the uppermost P-N junction requires high energy photon to kick the electron (or hole) out of the orbit, generates electrical current.

After photons travel pass through, the high energy photon will be absorbed completely by this high-exitation P-N.

This 'absorption' is occured at the middle GREEN and lower RED layers, too.

Because of the wave/particle property, you may think that the "YELLOW" photon is really composed of RED and GREEN photon pairs.

Green will be absorbed in green. Red will be absorbed in red, and the same vertical axis.

After that - you just calculate what is the true color of that pixel, given signal strength from GREEN and RED layer.

Direct link | Posted on Feb 22, 2014 at 06:12 UTC
On DSC_0006 photo in dpreview review samples's photo gallery (16 comments in total)

Agree. It's not UW. You've to multiply focal length AND Depth of Field by 2.7.

Best for macrophotography. Shot with 105mm macro @ f/11 will give you 2.7 : 1 photo with DOF of 11 x 2.7 or about f/29-equivalent DOF !

Or low cost super-telephoto? The AF-S 300 mm f/4.0D-ED will give your bird size bigger than that price-of-leg&arm AF-S 600 mm f/4.0G-ED.

Direct link | Posted on Sep 23, 2011 at 02:27 UTC as 5th comment
Total: 2, showing: 1 – 2