DOF and Cropping take 2

Started Feb 11, 2014 | Discussions thread
moving_comfort Veteran Member • Posts: 8,226
Re: What the heck is a cropped image ( with the 645d)

awaldram wrote:

So your now agreeing a crop from a larger is identical to the the smaller sensor - hallelujah.

and I see your also changing your mind

He in fact has changed his mind about nothing, either here or in the earlier thread. Neither have I, nor James, nor anyone who understands this stuff. We've been exactly consistent. What seems to be happening is you yourself have moments of clarity in which you understand what's being written or demonstrated and answer accordingly to some post, and then lose it the next. Too bad you can't be consistent with that clarity.

Total light gathering is irrelevant , per pixel light gathering determines noise.

No - total light gathering over the sensor area determines image noise.

The d800 with the same pixel density as 16 mp aps-c sensor unsurprisingly has the same noise and dnr.

It absolutely does not, at the image level. If what you were saying had any bearing on reality, a P&S made from the same sensor wafer as the K5 could be said to have "the same noise and dnr as the K-5", which it of course would not. Sensor area determines amount of total light captured which ultimately determines noise and contributes directly to DR.


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