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Usually those smaller images sizes will be down to “region of interest”
Basically if you are doing lucky imaging and the target only occupies a small portion of the sensor you can increase the frame rate and reduce file size by only reading the data off a small portion of the sensor.
The resolution is the same by way of angular size per pixel. I know you said above that you are not talking sensor size, rather image size, but essentially you ARE talking sensor size in this context.
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