Disapointed in my Df.

Started Apr 6, 2014 | Discussions thread
OP brianric Veteran Member • Posts: 8,330
Re: AF-S and self timer on a moving subject ?!!

Paul P K wrote:

brianric wrote:

j_photo wrote:

brianric wrote:

I was shooting a Relay for Life last night to 6 AM this morning at a local college and decided to use my Df. I had it set up for flash, AF-C single point, center point, focus priority. The Df struggled to lock focus in what I would consider in light, while low, not all that bad. I had to switch to AF-S, and the red AF-assist illuminator in order to lock focus. When I had a small break in the action I replaced the Df with my D800. With the same initial setup the D800 nailed the focus instantaneously 100% of the time.

At some point as light decreases, the D800 should come out ahead. I would be interested to know at what exposure (shutter, aperture, ISO) were you seeing the problem?

I took a picture with no flash, and it was f/4.0 at 1/80 at ISO 3200.

I just reread my DF manual on the (lack of an) AF assist light on the DF and the function of the selftimer (the red illiminator light) and think I now understand why your pictures with the DF were not in focus.

Apart from the low shutter speed, and the use of AF-S on moving subjects, given the minimum self timer speed of 2 (!!) seconds it would be amazing if you have anything which would resemble an in focus shot.

Basically you lock you focus on a subject which then moves away (however slow) from the spot you were aiming for during the millisecond between focus lock and shutter release, while the shutter actually opens at least two seconds (the minimum selftimer setting)after the shutter release was pushed.

I don't want to sound hasty, but unless the set up was chosen for artistic purposes, this really does not sound a fault of the DF, but rather a clear case of operator mistake.

Operator mistake in depending on the Df.

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