Graydon wrote:
On Wed, Apr 22, 2009 at 03:15:24PM -0400, Christian scripsit:
Graydon wrote:
Which is certainly a good thing, but _how_? What about the matte
screen indicates that you're in focus, or the location of the plane
of focus, or similar?
Ummm, because the image in the viewfinder looks sharp? Your eye and
brain indicate that it's in focus sending a signal to your right index
finger to trip the shutter.
This is where I get into the potentially-defective-brain issues.
Sport optics focusing is not a problem; I can pick the wee chirply bird
out of the thicket. When I try to do this with the camera -- move the
plane of focus so it runs through the bird and not vegetation in front
of or behind the bird -- I can sometimes do it with the split screen
because I can use the split to edge-detect the bird; if the line of the
bird is broken, the focus -- despite looking fine so far as my brain is
concerned -- isn't quite right and the picture comes out with a blurry
bird.
With the shipped matte screen of the K20D, I saw the image as sharp when
it (from the camera point of view) was not; it looks like if the plane
of focus was 5cm wide, I'd see the image as sharp over between 20cm and
50cm (depending on distance) of space in front of and behind that plane.
Drove me dotty.
My truly honest answer is that I rely on AF for 90% of my bird
photography these days with my current set of tools. I've learned to
understand how my camera works and can quickly and easily shift focus
points to make a pleasing composition. Sometimes I'll override the AF
with MF just to tweak the focus to where I want it. When I had an LX
and a matte (grid) screen I guess my eyes and brain agreed with nature
on what was in focus. I never seemed to have the trouble you seem to
have and I guess I never really thought about it too much either.
I also wear glasses and have calibrated the viewfinders of all my SLRs
to be pretty much perfect for me.
When I'm doing portraiture or landscapes, I use MF 90% of the time
(because my best portrait lenses are old m42 Taks) and have no trouble
getting it right with the stock screen in my (non-pentax) SLR.
--
Christian
http://404mohawknotfound.blogspot.com/
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