[notmanlmchan]

唔好意思r,想問下點解d相四角會黑左gei??

[tam_dominic]

Filter, lens hood can cause 四角黑左

Without filter and lens hood still 四角黑左, it is the design/short coming of the lens.
In this case you may change the aperture to improve.

Please reference the following lens testing site for details.
http://www.photozone.de/8Reviews/index.html

Hope this answer your question.
Happy shooting !

[maskedtsang]

主要睇你用乜野鐿，有啲原廠鏡都有黑角。解決方法：換鏡。