SMC-FA 45-85mm F4.5 filter size?

I've had a look online but haven't been able to find out what filter size this lens takes - anyone here got one and could let me know?

Cheers
Steve

don't have one but it looks like 77mm


http://www.adorama.com/US%20%20%20%20280981.html


Steve

Steve - thanks for that. 77mm would be good because I've already got adaptors and filters in that size.