Firstly thanks for taking the time to reply
Hmmm, I presume you want the milky waterfall effect and to get that you are going to need a medium to long exposure, some people use a ND filter to allow them to shoot low enough speeds, although I did do a few of these in Iceland hand held thats some pretty fast moving water.
Your issue is getting your model to stay still to avoid blurring and also getting the waterfall blurred so I'd say you have two workable solutions either; kill and stuff the model, I know you are already stuffing her, but I mean in a taxidermy style, or you could shoot at two different speeds and post process them together, I would say the second option is probably more complicated but less likely to incur a long jail sentence.
MB
I don't want to kill her just yet

so I think maybe option 2 is the better bet
Thanks, I've yet to pick a location but Im looking out for locations all the time.
The following link has some basic info / advice which might help you
http://digital-photography-school.com/waterfall-digital-photography
As for not wanting to spend a whole day out...why not? If you have access to all that equipment, and a willing model, then I'd try shooting at different times of the day and see what you come up with
...be sure to post some shots after you do the shoot
I've just read your your link, thaks for that it was very useful.
Oh I will be spending all day out its just I wanted to be sure I cracked this shot for her.
Best way is balance flash with daylight, light GF with the flash and then set the shutter speed to give yourself the desired effect with the water.
See this is my problem, Im fine in a studio with lighting etc, but I haven't a clue about using a flash with the camera or balancing
My first thought is cheat the shot.......Take two photographs, one with the model at a fast shutter speed to get her in focus etc, then remove the model and take the waterfall at a slower shutter speed to get the required 'flow' afterwards merge the two images for the final production photograph.
Just how i would do it.
I'm confident I'd be able to do this in photoshop but then for every shot I take of her, Id have to get her out of the way and it might be a bit of a pain. Will definately consider doing it though if that's what it takes.
yep, me too.
Sadly, I've got an image in my head of the model behind a waterfall with just her head sticking through it and all the water in the misty effect.
Now thats a ball ache to shoot!!
Good luck son
Thanks
Well it really depends how fast the water going I've done some really fast waterfall shots that only needed 1-2 seconds exposures for the really blurry effect, I'm sure a model could stay still for 1-2 seconds?
Your defiantly need an ND filter, the exact number depends on the waterfall and light on the day etc.
If you get some good ones post them up
Ive just checked and it seems all my dads old filters wont fit the lens

The filters are seriously old though.
You could do it in two shots but the exposures would be very different and you'll need moderate blending skills in photoshop.
A well set up flash system will allow you to set a long exposure for the scene allowing ambient light to expose the scene and the flash for the model.
You'll be playing a lot setting that up though and will require good understanding of flash.
I was thinking Id get away with opening both layers and blending the 2 while very carefully erasing the area where the model is. Would that work?
Here is a self portrait I did at a small waterfall almost 2 years ago.
long exposure of around a couple of seconds I think.
staying still is pretty much key here.
There is no soft element of this picture anywhere. Its like time was frozen on me.
If I had more flash units I would have done it the way I discribed above.
See now that is excellent and exactly what I am after. You literally just made sure you didn't move for 2 seconds?
This is the flash I can take out with me...
http://www.warehouseexpress.com/product/default.aspx?sku=1011441
Is that going to be right for the job?