sensor pixel pitch size and density

Introduction

in general, given the same technology, the larger the photosite (“pixel”) size or “pitch” on the sensor, the less image noise at high ISO although potentially less aesthetic digital noise as the noise pixels take up a greater proportion of the image, but on a given size sensor, this means lower pixel density and thus less megapixels, so there is always a trade off

camera	sensor size	megapixels	pixel size	pixel density per mm
12mp Sony a7SII 2015	full frame	12.2mp	8.32µm	119
Canon 1DX II 2015	full frame	20mp	6.54µm	153
Sony a7III 2018	full frame	24mp	5.91 µm	169
Fuji GFX50S medium format	MF	51.4mp	5.3 µm	188
Sony a7RII/III 2017	full frame	42.4mp	4.5 µm	222
Canon 7D II 2015	APS-C	20mp	4.08 µm	245
Fuji X-H1 2018	DX	24.3mp	3.88 µm	258
Sony a7RIV 2019	full frame	61mp	3.76 µm	266
Sony 100mp MF IMX 461 sensor 2019	MF	100mp	3.76 µm	266
Sony 150mp MF IMX 411 sensor 2019	MF	150mp	3.76 µm	266
Olympus E-M1 2015	MFT	16mp	3.72 µm	269
Olympus E-M1II 2017	MFT	20mp	3.32 µm	301

camera	sensor size	megapixels	pixel size	pixel density per mm
DALSA astro 2006	4“x4”	111mp	9 µm
Canon 1DS 2001?	full frame	11.4mp	8.8 µm
Canon 1DIII 2007	APS-H	10mp	7.4 µm	135
Olympus E-1 2001	FT	5.6mp	6.8 µm
Canon 1DSIII 2007	full frame	21.1mp	6.4 µm	156
8mp Canon APS-C 2005	APS-C	8mp	6.4 µm
10mp Canon APS-C 2007	APS-C	10mp	5.7 µm	175
10mp Four Thirds 2007	FT	10mp	4.7 µm	175
8mp Olympus C8080 prosumer 2005	2/3“	8mp	2.7 µm
12mp Canon G9 prosumer 2005	1/1.7”	12mp	1.9 µm