Thank you, I think the more I read the more I seem to be leaning towards the F4 also, it sounds better built and has been around and tested longer and I do like the fact about dust and waterproof with a filter on. Thanks again Nasser.

Thanks David for the quick reply.Nasser

I would like to buy a lens for my Can 60D and need help if you guys can point me in the right direction. I like to take pictures of landscapes and portraits. I like what I read on these 2 lenses CAN 24-105mm F4L USM IS
and CAN 24-105mm F3.5-5.6 Is. The second one being about $100.00 cheaper, can anyone please explain which would be better suited for my usage, and the difference between them. Thanks.

I am still a beginner at photography and would like some help at buying another lens for my newly purchased Canon e0s60d, have been looking at Canon EF 24-105mm f/3.5-5.6 IS STM , is there another brand that would do good portraits and landscape pictures. Thank you for any advice.