IR Filters and Lens Sizes

[Helium_Junkie]

Is there any adverse effect of having larger diameter IR filters? Thinking of how larger CP filters lose effect as they reach 70mm ish.
Basically, should I get an IR filter for my 77mm 10-20, or 67mm 18-70?
Thanks muchly

There arent any further modifications needed for IR effect are there? Just the filter and longer exposures?

 

[Helium_Junkie]

Well Im good to go then Brilliant! Thanks MK.