On 31/01/07, Brian Dunn <[EMAIL PROTECTED]> wrote:
>
> I received a 21 Limited. Center only autofocus always greatly back focuses on
> both ist-DS cameras, more on one than on the other. The 45 degree focus
> chart showed the 21 Limited back focusing almost off the far end of the
> paper.
How do
Just to clarify... Each of the zooms I tested correctly maintains focus as it
is zoomed. If you zoom in, focus, then zoom out wide and take the photo, the
photo is sharp as can be. If you autofocus while zoomed out, the autofocus
moves the focusing collar and the photo is then back focused.
Very few modern zooms are perfectly parfocal. It is best to focus at
the focal length you are going to use.
I haven't experienced any obvious focusing errors with the DA21 on
either DS or K10D bodies; however, the focus is more accurate on the
K10D. Finding the precise AF sensitive area is o
Brian,
In the autofocus era, I doubt that many (if any)
"zooms" are true ol'-fashun focus-preserving
zooms--they all seem to be variable focal length
lenses.
That's certainly true of the lenses I can afford,
anyway (including the fairly pricey 24-90, 16-45, and
10-17). Don't know about the high-
I see a lot of backfocus shots on my D. I did some tests with long
manual glass (500 mm) and couldn't reproduce backfocus. The focus
light in the viewfinder aligned with my manual focus and pixelpeeping
confirmed this.
I think I need to do some tests with the 16-45 on 16 mm.
Also called Pentax bene
I received a 21 Limited. Center only autofocus always greatly back focuses on
both ist-DS cameras, more on one than on the other. The 45 degree focus
chart showed the 21 Limited back focusing almost off the far end of the
paper.
I tested other lenses and found that they all back focus when s
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