I have not found the focus indication to be particularly accurate for
an f/1.4 lens. It's accurate enough for an f/4 lens. I ignore it
entirely when manually focusing a lens. (BTW, this is why when I'm
shooting wide open with an f/1.4-f/2.8 AF lens, I often tend to
switch to manual focus.)
I'd retry this test with careful focusing, ignoring the focus
indicator. Better yet, use the 2x Magnifier FB to really nail the
focus correctly when you're doing testing.
Godfrey
On Sep 2, 2005, at 6:44 PM, Don Sanderson wrote:
Here is a quick comparison of the "Wide Open" performance of my
like new SMCP-A50/1.4 and one of my rather dusty SMCP-M50/1.4
lenses.
Both at 1.4, both focused on the mailbox using the in focus indicator,
shots within a couple of minutes of each other.
Shot just before dusk in indirect light. On the ist-D.
JPEG straight from camera, no post processing.
Any idea what could be wrong with A?
It looks and acts perfect but the image quality below 5.6 hoovers!
By 5.6 they're about equal, at 8 and smaller the A wins. :-(
http://www.donsauction.com/pdml/A_vs_M.htm
Don
