Disapointed in my Df.

Started Apr 6, 2014 | Discussions thread
OP brianric Veteran Member • Posts: 8,327
Re: Disapointed in my Df.

Felts 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 have to say I'm very surprised at this... I'm almost always shooting in darker conditions than this (f2.8, 1/60, ISO 6400) is very common for me. I shoot AF-S, centre point. I don't have any problems acquiring focus. I also don't feel like I'm 'bragging' about this either but just presenting my findings...

Lens selection has to play a part in the differing evaluation too;-)

I had the Tamron 24-70/2.8 VC on the Df and 24-120/4.0 VR on the D800. Because the action was happening very fast at the Relay I needed to have instantaneously focusing to get the shot. I was losing too many shots where the students would make a goofy face or do something silly because the Df wouldn't focus lock where the D800 would.

When I do sports in the AF-C on the Df I have the priority selection for release, as I'm shooting at 5.5 fps, and don't care if the first shot or two are out of focus. When shooting with flash, I have the priority selection at focus, because I'm at single shot mode. The only thing that saved me until I had a chance to swap cameras was to set the Df in AF-S and use the AF illuminator from the flash in order to obtain focus. I was stunned at how the D800 had no problem focusing in the AF-C mode in the same lighting.

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