Shutter speeds with electronically controlled shutters are actually more accurate than the conventional marked speed numbers. The conventional speed sequence goes awry between 1/125th and 1/60th, and it would be difficult to adjust for the small discrepancy in a simple divider circuit. So if the electronic speed is accurate at 1/1000th of a second (=1 millisecond) then the time marked 1/60 will be 16 milliseconds or 2/125ths. The same happens between the speeds marked 1/15 and 1/8th which aren't exact multiples or divisors of 2 either. By the time you get to the speed marked 1 second, the precise electronic timer is giving 1024 milliseconds, and whole stop speeds after that get doubled up exactly. So no surprise that a marked 30 seconds gets rounded up to the 32 seconds it should have been in the first place. FWIW, can anyone work out the stupid 1/10th stop markings on modern digital lightmeters? For example; what the h*ll is f/5.6 subscript 7??? I know it means f/5.6 minus 7 tenths of a stop, but what's that in an f number I can set on the camera? Why don't the lazy b*st*rd programmers convert it to a real number? The maths is simple, even for an ancient 8 bit CPU.