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a1 - a10: Autofocus
How to Get Here
Press MENU, go to the left and select up and down to the pencil icon. You'll then see CUSTOM SETTING MENU on the color LCD. Click down to a AUTOFOCUS and click to the right.
What it Does
It sets many options for the advanced AF system.
What I Change
I change a1 and a3, and leave the rest at their defaults.
a1 AF-C priority selection top
At default, this lets you take fuzzy action pictures.
At the default "Release" setting, the D300s will fire anytime you press the shutter in AF-C mode, regardless of if it's in focus. Nikon's cameras usually can't run at their advertised frame rates and stay in focus at the same time.
At the default Release setting, most of your sequences will be out of focus! Set it to "Focus" instead and the D300s only will fire when it's in focus, ensuring a sharp sequence.
The default mode, this lets the D300s free-run at 5 or 8 FPS, whether or not it's in focus. In this mode often only the first few shots of a sequence are in focus.
Release + focus
I use this. It's a halfway setting. It makes the D300s slow down and get most action shots in focus.
This makes the D300s wait until it's in perfect focus before firing any shot.
Because it waits for focus you can shoot long bursts and they'll all be in focus, but I find its too picky than the Release + Focus mode.
See also How to Use the D300s AF System.
a2 AF-S priority selection top
At the default setting, the D300s only fires after getting perfect focus. Nikon call this "Focus Priority." It's the opposite of the default for AF-C mode, which lets the D300s fire at any time.
If you use off-brand or defective lenses that can't get the green focus confirmation dot in the lower left of the finder to light, the D300s won't fire. If you have a problem with this you might want to take this off the default setting.
The D300s only fires after it's gotten and locked perfect focus.
The D300s fires anytime you press the shutter, regardless of if it's in focus or not. Try this setting if your D300s seems to lock up with some lenses.
See also How to Use the D300s AF System.
a3 Dynamic AF Area top
There is a lot of crazy stuff here. I use 51 Points (3D-tracking) which lets the D300s, in the crosshair and AF-C modes, track a target and show you what its doing. See How to Use the D300s AF System for more.
a4 Focus Tracking with lock-on top
This selects how long the D300s focus tracking system waits to start looking for the subject if it loses it behind a tree or person. This only applies in the AF-C (continuous) AF position.
I leave this alone.
The D300s presumes the subject has run behind something big, like a billboard, if it loses it. The AF system keeps running without it for a while, expecting the subject to return on the same path from before. In LONG the AF system has a lot of patience for subjects disappearing.
The D300s presumes the subject has run behind something like a tree or another player if it loses it. The AF system keeps running without it for a little while, expecting the subject to return on the same path from before.
The D300s has little patience for subjects evaporating. It doesn't wait very long after it loses your subject to start looking for it again from scratch.
The D300s wastes no time tracking. If it loses your subject it immediately starts looking around again. You might want to use this if you're shooting a bunch of fixed things at varying distances one after another, but I use AF-S for that.
I've never moved this setting from its default of Normal.
a5 AF activation top
This allows the AF system to ignore the shutter button.
In its default position, the AF system turns on when you press the shutter or the AF-ON button on the back.
The D300s won't focus when you press the shutter. It only focuses when you press the AF-ON button on the back.
I've never used this. It might be helpful with an AF telephoto that lacks easy manual override. You'd use the AF button to focus, and remove your finger to lock.
a6 AF Point Illumination top
This controls when, or if, the AF points light up in the finder.
They light up as they need to. I leave it here.
Always on (when the meter is on).
a7 Focus point wrap-around top
AF point selection normally stops when you hit the edge of the constellation of AF areas.
Wrap lets your selection wrap around to the other side of the AF areas!
No wrap (default)
If you keep pressing the selector to the left it stops at the far left. I prefer it this way.
a8 AF point selection top
You may select any of the 51 AF points.
You only get to select 11 of the points. You don't have to click around as much with the Big Rear Thumb Switch, but you only get to select 11 of the 51 points. These 11 points are similar to the 11 points of the D2, F6, and D200.
a9 Built-in AF-assist illuminator top
This lets you deactivate the annoying AF assist light.
The annoying focus light lights as it wants to. This is great for shooting inanimate objects, but annoys people.
This makes it much tougher for the D300s to focus in the dark, but doesn't annoy your subjects.
a10 AF-ON for MB-D10 top
This lets you choose what the AF-ON button does if you have an MB-D10 grip when shooting vertically.
My D300s User's Guide continues below.
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