Question: more pixels at reduced size, is there a difference?

Started Jun 17, 2014 | Discussions thread
OP rhlpetrus Forum Pro • Posts: 24,540
Re: Question: more pixels at reduced size, is there a difference?

Luke Kaven wrote:

For any sensor, there are at least three factors that influence the rendering of high frequency (detail in this case) signal components at a given final rendering size.

You give the example of a 16MP final rendering size based on a native 16MP sensor, a 24MP sensor, and a 36MP sensor.

1) Bayer artifacts. The Bayer matrix reduces high frequency response as one approaches the Nyquist limit. Think of this as the slope of a filter function that diminishes in response as one approaches the limit.

2) AA filtering. This is another factor that, where present, reduces the high frequency response of a sensor as it approaches the Nyquist limit.

3) Downsampling. Downsampling is essentially a low-pass filter. And it too has a slope before the cutoff frequency.

The combination of these three things, among others, helps to determine the total MTF as it relates to your question.

In general, one finds that the higher resolution sensors, after downsampling, produce a more gentle roll-off in the high frequencies than the lower resolution sensors as one approaches the limits of the final rendering size. You can see this differential slope even at web sizes in the amount and quality of fine detail retained.

16MP - Noticeably better for hair and skin than 12MP, but with some roughness at the limits.

24MP - Very good fine resolution of hair, skin, and foliage that is retained after downsampling.

36MP - Excellent fine resolution with excellent quality very nearly up to the limits.

Others can elaborate, but this is the basic picture the way I have it.

Thanks, your comments may have solved my doubts about which FF to get, the D810, if no issues come up, is at the top of the pile right now.

-- hide signature --

OnExposure member
Good shooting and good luck
(after Ed Murrow)

 rhlpetrus's gear list:rhlpetrus's gear list
Leica D-Lux (Typ 109) Nikon D7000 Nikon 1 V1 Nikon AF-S DX Nikkor 12-24mm f/4G ED-IF Nikon AF Nikkor 35mm f/2D +4 more
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow