Lightmeter app

[DoctorJ]

I downloaded a lightmeter app onto my phone just top play around wIth and to see if it matched / improved on my D300S metering. As I use it it gives me a range of exposures as expected but also an 'ev' value from 1 to around 9. What is this?

Many thanks

 

[GreenNinja67]

An Exposure system invented by Friedrich Deckel.

Here's the formula.



N is the relative aperture (f-number)
t is the exposure time (“shutter speed”) in seconds

EV 0 corresponds to an exposure time of 1 s and a relative aperture of f/1.0. If the EV is known, it can be used to select combinations of exposure time and f-number, as shown in Table 1.

Each increment of 1 in exposure value corresponds to a change of one “step” (or, more commonly, one “stop”) in exposure, i.e., half as much exposure, either by halving the exposure time or halving the aperture area, or a combination of such changes. Greater exposure values are appropriate for photography in more brightly lit situations, or for higher ISO speeds.






Don't thank me thank Wikipedia.

 

[DoctorJ]

Think I will just look at the dial then.....

 

[GreenNinja67]

I would