Pixel 2 sensor - 9.77mm inch, 12.2MP, 1.4μm, f/1.8
Canon 700d - APS-C, 26.82mm, 18MP, 4.29μm, f/5.6 or f/2.8 or faster
Canon Lens: EF-S 18-135mm f/3.5-5.6
Focal length and Max Aperture (depth of field)
18-21mm = f/3.5
22-30mm = f/4.0
31-40mm = f/4.5
41-63mm = f/5.0
64-135mm = f/5.6
Aperture influences a depth of field, area of image that appears sharp.
Bigger aperture - smaller depth of field, smaller f-number
F - f-stop, f-number
F16 - smaller aperture (smaller pupil of an eye), will bring background and foreground objects into focus