lugiamcg: well, AF speed, is influence by SOOOOoo many factor that, is so subjective. there is NO way to Generalize ALL lens characteristic. each lens has diff gearing, diff length, diff IF or EF design, diff gear size, and lot more.... even technology plays a factor, and camera body.
when u compare direct 1 point to another point, like SSM vs SAM or SAM vs body motor, it's easy to compare because we neglect the gearing possibility...
A450 cant 4fps with MF LV check. it cant, the mirror flip cant flip that fast~ unless it has mirror lock up features. i cant comment, i dont own a A450. however so, it has a LV but its for MFLVcheck, which is not practical because it does not activate AF.
Fighteden: depend on ur NEEDS, but if not for mobility, u are making a big mistake letting go the A300! A330 does not have a battery grip option (i prefer to call it Vgrip as Vertical Grip (or vertical orientation grip)). sony was thinking that Entry level is pure entry (family shooter), u dont need fancy tools to make it look big... u wan big, go BIG... like A4xx,5xxx,7xx,8xx,and 9xx

QUOTE(Banzai_san @ Mar 5 2010, 08:05 PM)
btw, the blue phase sounds something similar to A700 2.8 sensor? but A700 is trigger when using 2.8 lenses ... if Im understand it correctly ...

nope... A700 has all of A550 + extra F2.8 sensor. so it triple the sensitivity. but new tech AF is always more sensitive/accurate/smarter
the vertical and horizontal sensor, we call it cross sensor, cross as a '+' shape. all models has cross sensor for the centre AF point (sony calls it focus area =.=)
QUOTE(hkhk @ Mar 5 2010, 09:53 PM)
err. are u saying 70-200G is slow? 70200G is SSM lens. I believe it is slow due to the
Weaker AF system on A200/A300 body compare to the A700-A900. The Key here is the different AF system used in those 2 class of body.. nothing related to the motor i think..
i didnt generalize 70200G as slow lens... i said it was slow on a A200, hence, yea, it could be body dependent too... but i wont say weaker, it did lock on first focus, it did not hunt, but it felt bout a little faster then 55-200 @.@ hence, i judge is on A200 is slow?
seriously, i cant really judge, might be the sensor itself, or the body tells the SSM to go slow, the optimum of the AF sensor speed? it was kinda slow on A200,... but i heard from a friend of A900, he said it was really really fast... i have no comment, unless someone with A200 and A900 with 70200G can do a control test and tell us the result...
the major noticeable thing is, its total silent... u keep asking urself, is the lens focusing? or not?
This post has been edited by ieR: Mar 5 2010, 11:07 PM