I'm not sure this is an "alternative technique" so much as it is an economically motivated technique. As we all know, SX-70 film is no longer being produced for Polaroid Land Cameras (and a couple of other models too), so it is becomming hard to find and expensive. Polaroid 600 film on the other hand is rather easy to find- it's available almost anywhere in the US. I have an old Land Camera that I got for free. I noticed that someone had been shooting 600 film in it, but they had filed off the little "teeth" on the cassette in order for it to fit properly. I got some 600 film and gave it a try, cutting off the teeth on the cartrige and putting it in. Everything feeds just fine, but the problem is contrast. When I used the flash bar, it almost completely whitewashed my photo. When I don't use the flash bar, there's absolutely no white, and the darks are not clearly defined. There is also very little color. So, the question is, have you successfully used 600 in an SK-70 camera, and if so, how did you make it work and look good?