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The D7' s lens performance seems to be good . It does not have a
focus assist light and some have commented about irritating focus
hunting .
I am interested in buying this camera and would like to know if the
dedicated Minolta flash with af light function solves this problem .
The D7' s lens performance seems to be good . It does not have a
focus assist light and some have commented about irritating focus
hunting .
I am interested in buying this camera and would like to know if the
dedicated Minolta flash with af light function solves this problem .
As far as I know all the consumer and prosumer digital cameras use
a contrast detect technology. This means they are all slow and
inaccurate. The Sony F707 attempts to correct this by using a low
power laser to create a pattern that assists the contrast detect
technology.
D7 also has contrast detect, and thus, can not take advantage of
the AF assist light. If the light turned on, it would only waste
power.
The only digital cameras that support the use of more advanced
Phase detect technology are professional camera.
Hope this helps,
Kalahari
The D7' s lens performance seems to be good . It does not have a
focus assist light and some have commented about irritating focus
hunting .
I am interested in buying this camera and would like to know if the
dedicated Minolta flash with af light function solves this problem .
As far as I know all the consumer and prosumer digital cameras use
a contrast detect technology. This means they are all slow and
inaccurate. The Sony F707 attempts to correct this by using a low
power laser to create a pattern that assists the contrast detect
technology.
D7 also has contrast detect, and thus, can not take advantage of
the AF assist light. If the light turned on, it would only waste
power.
The only digital cameras that support the use of more advanced
Phase detect technology are professional camera.
Hope this helps,
Kalahari
The D7' s lens performance seems to be good . It does not have a
focus assist light and some have commented about irritating focus
hunting .
I am interested in buying this camera and would like to know if the
dedicated Minolta flash with af light function solves this problem .
First, all literature I've seen on the D7 claims it has phase detection AF. Second, why on earth wouldn't the AF assist light help a contract-detection system? These systems start having problems in low light (thus low contrast) .. shining some light on the situation will bring that contrast out considerably and give the AF something to lock onto.D7 also has contrast detect, and thus, can not take advantage of
the AF assist light. If the light turned on, it would only waste
power.
First, all literature I've seen on the D7 claims it has phaseD7 also has contrast detect, and thus, can not take advantage of
the AF assist light. If the light turned on, it would only waste
power.
detection AF. Second, why on earth wouldn't the AF assist light
help a contract-detection system? These systems start having
problems in low light (thus low contrast) .. shining some light on
the situation will bring that contrast out considerably and give
the AF something to lock onto.
If the D7 really has phase detect instead of contrast detect, then
I do not understand why the focus is so slow.
Second, for a contrast detect system to use an AF light it has to
be at a frequency that is detectable by the CCD.
I guess in the end this problem may not be hardware related at all,
but rather software related.
Kalahari
First, all literature I've seen on the D7 claims it has phaseD7 also has contrast detect, and thus, can not take advantage of
the AF assist light. If the light turned on, it would only waste
power.
detection AF. Second, why on earth wouldn't the AF assist light
help a contract-detection system? These systems start having
problems in low light (thus low contrast) .. shining some light on
the situation will bring that contrast out considerably and give
the AF something to lock onto.
Well I double checked the Minolta site and it clearly stated that
Dimage 7 uses Video AF (or contrast detect) and not Phase detection.
Here is the quote from the FAQ on the Minolta site:
Question:
Why does the DiMAGE 7 take time to focus on the subject in AF mode?
Answer:
It is due to difference in AF systems between the DiMAGE 7 and
Maxxum/Dynax SLRs. In general, the conventional film cameras
(silver-halides) use AF system called Phase Detection, while Video
AF is widely used for DSCs. The Phase Detection system, which is
capable of obtaining defocus amount and achieves high speed AF
operation, usually requires a large space between the optics and
CCD to split through-the-lens light for distance calculation. Thus,
given priority for compactness, non-lens-replaceable DSCs are often
equipped with Video AF system, which operates comparatively slower
than the phase detection. DiMAGE 7's AF is not inferior to other
DSCs featuring Video AF.
Steves digicams and Imaging resource both state phase detection.Very interesting. Earlier in this forum, much was made of the fact
that Minolta claimed to use Phase detection on the D7 and
specifically spoke of the disadvantages of contrast detect with
respect to the D7's system.
Steves digicams and Imaging resource both state phase detection.
-----------------
Andrew.
The D7' s lens performance seems to be good . It does not have a
focus assist light and some have commented about irritating focus
hunting .
I am interested in buying this camera and would like to know if the
dedicated Minolta flash with af light function solves this problem .
