Good morning,
After the discussions on ZX5n vs PZ1, I decided to take my ZX7 out front
and track some trafic passing by.... Before you think that you can't get
virtual cornering speed of a race on the street, I live on Bird Road (posted
speed 40, average speed is 55-60).
Anyways, I tried out the Tamron 70-300 macro that I have on loan (my 80-320
is still being fixed). This is the new lens that has the macro focus lockout
from 180-300, 1:2 @ 300 @ 3'/1:3.9@ 180 @ 4.9' and larger 62mm filter size.
I tried the "action" mode in single fire and continuous fire. Works better
in single fire, but not great. I assume this is because it is figuring out
the best Shutter and Aperture as well as Best DOF for the focal length. A
lag, but not bad and I can get the object in focus that I want by
redepressing the shutter release to recompose. It keeps the Shutter and
Apreture on the recompose. I assume this lens has the full FA program, as
this is the lag that is present in the 80-320. In continuous it is worse, it
kind of freaks doing the above calculations and tring to keep up with the
2fps. By the time it has figured this out the object in focus is not the one
you would like. I won't use this mode for fast action, maybe for baby ducks.
I tried next in Av and Tv in both single and continuous fire. Much better by
far than the "action" program. In single fire there is more hesitation in
the AF on the recompose than the continuous fire. Actually, in Tv or Av on
continuous you can compose and recompose rather quickly. It must throw out
the DOF calculation in continuous and give the best all around Aperture for
the given Shutter speed. I assume this of course, there could be another
reason for this.
In regards to this lens, the lenses macro mode changes the whole personality
of this lens. I set the lens to 200 mm locked in the extra focus of the
macro feature and took some shots. While tracking the cars I would compose
and recompose as they passed me by I had focus on the passenger window full
frame. It would not track and focus this close in normal focus mode even
thou it was well above the minimum of 4.9'. It worked rather well tracking
from 200 feet to about 14 feet in macro, but would loose it at 30-25 feet in
normal focus and recompose a couple of extra times. I have no assumption as
to why this would be. What might I be missing? I guess I will have to find a
brick wall and run a roll of film thru to see if this lens is any better
than the last 70-300mm from them.
l8r,
Douglas E Harmon
[EMAIL PROTECTED]
http://personal.mia.bellsouth.net/~genius91/
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