Questions About Sensor Size and Pixel Pitch

Started 2 months ago | Discussions thread
sybersitizen Forum Pro • Posts: 13,796
Re: Questions About Sensor Size and Pixel Pitch

Chaplain Mark wrote:

sybersitizen wrote:

Chaplain Mark wrote:

sybersitizen wrote:

Chaplain Mark wrote:

My question was, does a larger sensor size automatically mean a smaller pixel pitch?

The answer is no. A larger sensor might have larger pixels, or smaller pixels, or the same size pixels as a smaller sensor. Depends on the specific sensors.

Okay then, the two sensors to compare are, Sony a7Riii full-frame 43mp and Canon G5X and G3X 20 mp 1-inch type, (sensor built by Sony?)

Do we know if the FF sensor is more pixel-dense than the 11-inch type?

It's just simple math using specs found online.

The specs I found say the A7RIII sensor is 35.9mm x 24mm with a pixel count of 7952 x 5304, and the GX5 sensor is 13.2mm x 8.8mm with a pixel count of 5472 x 3648.

You only need to look at one dimension to get the approximate pixel pitch. Using the long dimension:

35.9 / 7952 = roughly 0.00451mm per pixel. 13.2 / 5472 = roughly 0.00241mm per pixel.

The pixel pitch of the GX5 is much smaller.

If you're curious about a small sensor with comparatively huge pixels, the Sony DSC-D770 (my first digital camera, introduced 20 years ago) has one. Its sensor is 6.4mm x 4.8mm with a pixel count of 1344 x 1024.

6.4 / 1344 = roughly 0.00476mm per pixel ... a tad larger than those in the A7RIII.

Lol @ "simple math" such thing for me, I'm afraid....

Proceeding from your answer (thank you for that,) it seems the physical size of pixels in the G5X is larger and therefore the sensor in the G5X is less pixel dense per square unit of surface area ...

No, that's completely backwards. Please read again, especially the text in bold.

This seems to suggest that detail capture (resolution) is more about sensor size than pixel density?

Both factors, plus lens characteristics, can influence a camera's ability to capture and retain detail. In general, pixel count is the major determinant of that as long as the lens is up to the job.

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