I guess you need to know well about two of the function on A550

DRO and HDR were similar actually in some sense

for DRO (Dynamic Range Optimizer)

Just my self opinion ...
- Allows to pull up the lighten up the dark shadow or lower down the high exposed highlights just like HDR but not significantly strong as it
- Allows to use to fire in continuous shooting and shutter priority and also works on RAW
- Has 5 Lv. to adjust (from weak to strong effect)
- As the level, the more you goes, the more noise will gain
- As the level again, the more you goes, the more color distortion will gain too (as I found out red, orange and yellow shows very obvious color distort on level 4 and level 5 DRO)

for HDR (High Dynamic Range?)

Again my self opinion .... XD
- Uses 2 picture (meaning 2 shutter) combines into one for creating the dynamic range effect
- Like DRO making up the dynamic range however HDR has much stronger effect
- Compared to DRO, the shooting on HDR has less noise effect on high EV (2.5~3.0EV) settings but more visible Chromatic Aberration (CA)
- 2 Shutter still proves certain of problem on slow shutter speed because it will record 2 different motion at the same time so it makes HDR unlikely to use on fast motion or even the moving object
- HDR doesn't compatible on RAW and Continuous Shooting

i think i will start spamming pictures over here.... 

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ps: ok i better run now....

ah, nice. Thx 4 the infos =D Those are the sideeffects that i've been looking for 

one more question, do u use it often? =D

depends ...

I usually use DRO Lv.2~Lv.3 for normal shooting

while HDR for shooting landscape or some non (or very slow) moving object in fast shutter speed

as ... I seldom not so understanding the usage for DRO Lv.4~Lv.5 in what situation BTW >.<

anyone knows any fisheye converter for 67mm?

(poisoned already but still wanting to try out before buying tokina 10-24)

freddy manson : Fisheye converter useless wan la. And where got such thing as Tokina 10-24? Either Tamron 10-24 or Tokina 12-24 only la. (:

its tokina 11-16 or tamron 10-24 bro.. but why wasting money to the converter which might degrade IQ?

anyone knows any fisheye converter for 67mm?

(poisoned already but still wanting to try out before buying tokina 10-24)

ya ya ya dizzy from the fisheye pictures already..
now looking on the tokina.. ot should i get the samyang 8mm instead?
CJLai? can get discount kah ha ha hav

If you are referring to the Tokky fisheye, it's Tokina 10-17mm f3.5-4.5 AT-X 107.

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Added on February 18, 2010, 3:28 pm

Forget about getting the cheapo Samyang. Save up a little more and straight for Tokky. You'll never regret.

If you are referring to the Tokky fisheye, it's Tokina 10-17mm f3.5-4.5 AT-X 107.

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Added on February 18, 2010, 3:28 pm

Forget about getting the cheapo Samyang. Save up a little more and straight for Tokky. You'll never regret.

any samples from the tokky...???how much btw for that lens....

If you are referring to the Tokky fisheye, it's Tokina 10-17mm f3.5-4.5 AT-X 107.

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Added on February 18, 2010, 3:28 pm

Forget about getting the cheapo Samyang. Save up a little more and straight for Tokky. You'll never regret.