[gilng]

近日上綱看PMA Spring 2007 Show見到 expodisc 話可以set WB,
http://www.expoimaging.net/products/product_detail.php?prodid=2&productname=ExpoDisc_Digital_White_Balance_Filter_-_Neutral
在香港那裡可買到，$$如何

[keyman23]

u can go to shops on Stanley St. in Central , there is a shop that carry the filter ($999 ) but I forget the name of the shop.

[andrew6612]

Does that mean that you have to carry out a calibration every time you change your lens or every time you change lighting condition?