Steven Green <steven{dot}(E-Mail Removed)> wrote:
> Actually, I have not played with this setting as yet. I assume it is
> still in "A" mode since I have not changed it.
Okay, this got me thinking. The focus-mode options are S, C, and M,
for single, continuous, and manual. I don't have a D40 specifically,
so I went and looked at the pictures of it on Nikon's site and it
doesn't have a dedicated control for this, though -- and, as it turns
out, from looking at the manual, there *is* an A setting on the D40.
(The A/M selection on the lens is a different thing from what I'm
talking about.)
The D40's A setting is a bit troubling, too, since it actually chooses
between "single" and "continuous" depending on what it thinks is best
for the current situation. And this is the default setting. Also by
default, the camera uses closest-subject autofocus, whereby the camera
chooses one of the several focus points. So as a result it's hard to
even determine what the camera is going to be doing in your situation.
I think this might be a factor here. The camera may be focusing on
something other than what you intend, if there is something in the
frame that is closer (part of the bird feeder, for example). And it
may be switching to "continuous" focus mode on its own, too.
So, here's what I'd like you try. First, switch the camera to the
"AF-S" mode. This is on page 23 of the manual (at least in the online
PDF version). In this mode, the camera focuses when you half-press
the shutter button, and then once it achieves focus, it stops.
On the next page of the manual is "AF-Area Mode". Switch this to
"Single area" mode. In this mode you select the focus point using
the directional selector on the back of the camera; the selected
one will be highlighted in the viewfinder. Just leave it on the
center point and don't move it. If you move it by accident, you'll
notice the wrong focus point lighting up when you try to focus,
in which case you can just move it back to the center.
Now, when you go to take a shot, place the center focus point on
the point where you want the focus, and half-press the shutter
button. The camera will focus. When it stops, you can take the
shot. Try this and see if it now focuses where you want.
The default settings are not really ideal for things like birds
with a long telephoto lens, where focus really is critical. It's
more of a "snapshot mode" where you just want the camera to get
focus and don't really care about being absolutely precise about
what you're focusing on, but with a 300mm lens and birds, that's
probably just not good enough.
> Additionally, I don't want to let all the heat out so I have the
> window closed and take the picture through the window at the moment.
> I am still trying to see how good of pictures I can take through the
> window, but my next attempts are likely to be outside.
Shooting through the window will definitely make a difference, but is
not the source of the problem you're having with focus. Think of that
as the next step.
> If anyone has any recommendations with regard to putting the camera
> outside in the cold (bringing it down to temp for condensation reasons
> etc.) I would love to hear it.
The camera can handle the cold just fine; it is the changes in temperature
that cause the problem. Just putting the camera outside and leaving it
there won't be a problem; you may get condensation when you bring it
back inside.
> As a side note, I considered doing shots with the mirror locked up as an
> additional step in getting the focus right, but the D40 does not support
> shooting with the mirror locked up as near as I can tell, only sensor
> cleaning.
This won't help anyhow.
--
Jeremy Nixon | address in header is valid
(formerly
(E-Mail Removed))