I have happy memories of Aira Force from our honeymoon
Thanks for the reminder, it means a lot!
Now, your shots. You have composed them quite well considering the limited angle you get on that bridge. Were you using a tripod? If not, it explains the blur, though it could also be other people walking on the bridge, or even the vibrations of quite a powerful water fall. I remember it vibrating under foot when we were there. It could also be that as time went on you collected more and more fines spray on your lens, which took away some IQ :shrug: Anyway, I think 1/5 and 1/8 shutter speeds along with f/22 is where your problem lies. If you had used a smaller aperture, say about f/9 you would have got a brighter exposure, allowing you to up your shutter speed which would have in turn lowered the amount of blur/softness (unless it was water spray of course). Upping your ISO to about 400 would also have helped you get it up even more (ooh err
).
You don't necessarily need filters, I've managed so far without them, as many other folk have. I admit they are a huge bonus though and at some point I would like to get myself a set.
It's definitely worth a re visit if you can, and just have a bit more of a play with your settings