Mills claimed to be using f/1.6 on an f/1.4 prime lens with a very low ISO (I think he said 60) and a shutter speed of 1/8000 of a second.Posted by ThePythonicCow (here)
I thought f-stops determined depth of field, not shutter speed. Granted, getting fast shutter speeds and tight f-stops at the same time is (I'm guessing here ... at the ragged edge of my knowledge) more difficult. I would think that you would need a fast sensor, quality lenses and lots of light - but Mills had all those. Is that camera's auto-focus so good that it might have deliberately focused in on the bullet's contrail, center of shot? That would be sweet, if so.
In that context....
His primary objective was to get a razor sharp image of Trump's face with everything else blurred to one extent or another. The last thing he wanted was to blur Trump's face or get it out of focus. Trump's baseball cap should also be razor sharp. It absolutely isn't, in spite of being on practically the same focal plane as his face.
F/1.6 was important for a very shallow depth of field. And also letting in a lot of light through the aperture to reach the sensor.
An ISO of 60 will yield a very sharp image. The higher the ISO, the more grain and noise the image will have. High ISOs are typically for low light conditions. The rule of thumb is to use the lowest ISO possible to get the clearest, most detailed image. You can't get much lower than 60, it's really low.
The natural light conditions appeared to be strong and bright with a low sun almost directly in Trump's face. Plus there were two huge spotlights on a lighting rig just in front of the stage. The light conditions plus f/1.6 plus a very low ISO meant Mills had to bump his shutter speed up to crazy fast levels to expose his images correctly. Hence 1/8000s to avoid over exposing his images.
Under those conditions and with the exceptional quality of his camera and lens, Mills could have easily used an ISO in the thousands to get a really good image. In a traditional sense his shutter speed was overkill for that type of shot, absolutely nuts. So was he intentionally fishing for a 'magic bullet' moment? Or was he intentionally fishing for the tech jargon cover for such a moment to be photoshopped in later? Was the f/1.6 and bokeh spiel covering for anything? The blurred figures in the crowd are a fair distance behind Trump. He could have used a chunk narrower aperture and still blurred them out.
The camera's autofocus is the best there is. It would have been specifically aimed at (and searching for) Trump's face/eyes/smile. The only way to stop this, hypothetically, is to use manual focus.
The image looks like it was taken by a hobbyist in a hurry using manual focus with shakey hands. Plus that crazy hobbyist also went and turned off the camera's in body stabilisation system and the lens' stabilisation system too. It's a hell of an image.But he did manage the million to one magic bullet/magic contrail shot too, of course, so there's that.
Mills' interview was so flakey and tedious I drifted in and out of it the first couple of times I listened. His images obviously have to go through his editor before publication. But I think he also said he has to surrender all of his digital equipment to the secret services and their checks before going home at the end of the day. That process could allow all manner of censorship and manipulation to enter the fray.




But he did manage the million to one magic bullet/magic contrail shot too, of course, so there's that.
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