Wich filter ?

[StCraft]

Why do i need a filter with my lense ? (kit - 100mm macro)
Wich one i need to buy ?

Polarizer ?
UV ?
Multi-Coated ?

 

[Blazer88]

Need? You don't need any filters, IMO. I do use a UV filter on lenses that leave the house just to protect the front element from scratches. I don't think you need one for the 100mm. But if you do, I would get a high quality multi-coated filter. I personally use the Hoya super HMC Pro-1's.

 

[StCraft]

Ok, something i don't understand : What size of filter im supose to buy ?

With the 18-55 and the 100 macro

Does the polarize will delete a bit the reflect on the glass of the aquarium ?

 

[Blazer88]

I don't think polarizers will do much for aquarium photography. I have one that I use on my Sigma 10-20 or Canon 24-105L for landscapes and such, but not the tank. They also cut down on light which doesn't help anything. They can help remove some reflections from the glass but I would rather just turn out the lights in the room. The kit lens and 100mm take 58mm threads. Keep in mind though, many lenses use larger filters (I use 77mm filters) so many people get a larger filter and a set-up ring so they don't have to purchase filters for every lens.