Why i thought square cause i read the sticky, can be cost saving for long term. which thats what i thought is good.
And i read tianya some is good.... but i still abit lost... cokin i google, is cokin.fr ...
The word "Good" is hard to define. It's like asking the "Best" lens.
The Good/Best ones are those that serves your purpose.
The website Cokin.fr is correct... (the website abit chui if you ask me..) btw, If you are going to use the filters on a UWA, I really recommend going 1 size bigger...which is alot more expensive (esp for those high end ones).