Recently I read a blog post from someone claiming Mirror-Up shooting was a hoax. A waste of time, something camera manufacturers dreamed up as way to add a new feature to the camera and charge more for it. A “Emperor’s New Clothes” hoodwink, if you will. Well, take a look at this:
It’s slow motion video of the venerable Nikon F2 at 1/2000 sec. and the lens stopped down to ƒ16. If there were ever any doubt in anyone’s mind whether the mirror’s movement has the ability to create vibrations inside the mirror box this should answer the question once and for all.
To those who don’t know what Mirror-Up shooting is, please visit this page for a more detailed explanation. Essentially, M-Up is a feature included in certain cameras allowing a 2-step shutter release. The first step raises the Mirror up out of the way. The camera then is allowed to “settle” as long as you want before the second step – releasing the shutter in the camera and actually exposing the film. This all happens so fast in regular shooting that it feels like 1 quick step – but it’s actually 2. M-Up is highly useful in slower-speed photography: between 1/30 sec. and 1-2 seconds. For shutter speeds outside of this range it could be argued that the motions happen so fast there’s not time for the slight movement to affect image quality. But in that dead zone of slow exposures M-Up is real.