Most photographers complain about the lack of reactivity of their fully automated modern cameras. Especially those who practice street photography (which is not the case of the above picture).
Well, there is an effective way to cope with this issue. The goal is to make our camera skip the standard exposure and focusing routine, so that we can simply and quickly press the button and get the shot taken. No two-step pressing, no focus buzzing, no delay. As in the "good old times."
First of all, the lens must be set to manual focus. A short prime, like a 28 or 35 mm (or their equivalent) is the best choice. Otherwise a zoom lens set to the same focal lenght will do the job. Focus must be manually set to the hyperfocal distance, which is the distance allowing a depht-of-field, say, from 3-5 meters (10-15 feet) to infinity, provided that aperture is set to an average value like 8, with APS or the so-called full frame sensors. The smaller the sensor, the bigger the aperture: 4 or 5,6. In digital capture, smaller apertures are always to be avoided because of diffraction. As for the hyperfocal distance of your lens, it can be easily found: the web is full of dedicated, easy-to-consult charts.
So, with camera mode switched to manual, we set the aperture at 8. Now the question is: how can we be ready to shoot without a light metering procedure? In a recent comment to a post in Gordon Lewis' Shutterfinger blog, I recalled the time (only a few years ago, yet it feels like ages) when I mostly shot b/w with a meterless Leica M4-P, applying the so called 16-rule: under a bright daylight, with the aperture set to 16, shutter speed must be the reciprocal of the selected ISO value, i.e. 1/100" f/16 at ISO 100. Or 1/200" f/11. Or 1/400 f/8, which will be our option. If we like to get our photograph a little underexposed (1/3 IL is a clever choice, in street and candid photography) the exposure will be set to 1/500 f/8.
As simple as that. With cloudy weather, the 16-rule becomes the 11-rule, and so on.
By the way, Gordon Lewis' website is also worth a visit. Enjoy.