HI guys,
The number to call: 6223 7217. The owner is Mr. Wong.
I always call before I go down as his opening hours are a little odd. Can't remember if he is open on Sundays. But you can check with him.
He is very friendly once you get to know him. He has quite some nice stuffs like Heliopan filters, Voigthlanders etc. Most odd stuffs you cant find in other shops.
Regards.