[dan97]

Hi

I need your opinion if the problem is due to handshake or back-focus problem

tks in advance

http://www.ec-photo.com/main.php?g2_view=core%3AShowItem&g2_itemId=160968

IMG_0949 - focus at center battery
IMG_2364 and IMG_2367 - focus at fiona face...

I am using 350d with small small white - zoom at 200mm

dan

[Victorlolo]

dan97,沒想到在這碰到你! 認得我嗎?
在這常聽到部份350D用家投訢部機常有走焦問題,唔知係味找canon tune鏡好D，IMG_2364看來是focus到fiona背後那塊板去，IMG_2367應該focus準確,只是少許手震問題

[dan97]

Hi Victor

Of coz i remember u. it seems there are various things that i need to improve

1. speed - should opt for 1/320 since 200mm with 1.8 crop
2. i just discovered my occassion back-focus problem could be cause by body movement - not hand-shake.... so need to practise more

dan

[peterchan04]

>> IMG_0949 - focus at center battery

電池要"打鈄排"先知. 重要用腳架. 相機 set 中間對焦點.
而家中間個粒sharp (可能有手震) , 不過平排點知 back focus or front focus.

[dan97]

Hi peterchan04,

The battery is already 打鈄排. it is just 1 closly pack together.\

重要用腳架 - already and use timer to avoid handshake as well
. 相機 set 中間對焦點 - already .

in fact, i have more discovery ... for picture unclear.jpg and clear.jpg. basically both shot under same condition (hand-held) and 1 is clear, 1 is back-focus.

my own analysis is the back-focus is due to a slight body movement (probably move forward a few CM) causing the back-focus problem

dan