Godfrey DiGiorgi wrote:
From: Tim Øsleby <[EMAIL PROTECTED]>
I wasn't accurate when saying this. I was thinking about the red
blinking
light telling me what focus sensor that is in use. You can switch
those off.
The green polygon is impossible to turn off, I believe.
Don't let it bug you.
How do you turn off the focus confirmation in the istDS? That green
polygon seems to be impossible to get rid of.
I know many turns the focus confirmation off.
I always turn off the focus spot overlays when using a manual focus
lens. You can't turn off the green indicator. With manual lenses, only
the center AF sensor is active anyway, there's no need for an indicator
spot on the focusing screen.
In my opinion, the focus confirmation on manual focus is accurate
enough to focus a lens in the 14-135mm focal length range that is set
apertures smaller than f/3.5. F/2.8 is pushing it.
Do you mean a lens with a maximum aperture of 3.5 or 2.8? I dont think
it matters what the aperture is "set" at, since it focuses wide open,
except for screw mounts.
This is in contrast
to letting the AF work with an AF lens, where it will succeed in
nailing the focus right on the money even with an FA50/1.4.
In fact, I have a problem with my *D and the FA85 1.4. It can autofocus
it quite accurately, but I consistently backfocus with it manually.
I
conjecture that the difference in accuracy is due to the fact that only
one sensor is operating ... when you have all 11 sensors operating,
they could be adding more information into the contrast comparison and
thereby improving the accuracy.
With a very long lens, and particularly one with a maximum aperture in
the f/5.6 range or smaller, it's probably not accurate enough to rely
upon. Make sure the focusing screen is properly focused to your eye
with the diopter control, and then learn to get the best focus point by
watching the out-in-out of focus transition and practicing.
The center AF sensor on my DS covers a slightly oblong rectangular
region the starts about 1-2mm above the focusing screen center and ends
about 3mm below it, and is 2mm wide. It's offset about 1mm to the left.
While I'm at it: What area does the spot meter cower? Online resources or
explanations on this too, please.
The spot meter pattern is constrained to be approximately the center
circle of scribed on the focusing screen with the standard or "divided
matte" screens. See page 131 in the *ist DS instruction manual for an
illustration at the bottom of the page. In my sensitivity measurements,
it proved just a little larger than the illustration suggests.
Godfre
y
--
Someone handed me a picture and said, "This is a picture of me when I
was younger." Every picture of you is when you were younger. "...Here's
a picture of me when I'm older." Where'd you get that camera man?
- Mitch Hedberg
