Originally Posted by shooter01
I have a Nikon D70 that I am trying to use with a Novatron D1500. Every time I shoot, I get a whiteout. There is no picture. I can disconnect the 1500 andeverything seems to work fine. Any ideas or help????
You need to either use a handheld flash meter to measure your flash output or figure out your exposure manually. To do this, you need to know the guide number for your power pack and under what conditions it was measured.
A quick trip to the Novatron website reveals that releasing 1000 watt-seconds through one head (the max allowed per head) gives you a guide number of 398 at 10' with ISO 100. The f-stop you need to use is calculated by dividing the guide number by the distance the head is from your subject. So if your subject is 10' from the head, you should use an f-stop of 398/10 or 39.8, which is f/32 1/2 (more or less). Since the D70 has a minimum ISO of 200, you need to multiply the guide number by 1.4. This would mean using an f-stop of 557/10 of f55.7 f55.7 is about halfway between f/45 and f/64, so you need to set the aperture to f/45 1/2 (more or less). I'm guessing that your minimum aperture is somewhere around f/22, so you need to reduce the power of your power pack. If you can reduce the power to 1/16th. power, you can use an aperture of f/16 1/2.
The above is only for a single, bare head. If you want to use umbrellas, softboxes, or other modifiers, you're going to have to experiment (a lot) and figure out how much light those modifiers reduce your output by. You'll have to do the same thing as you start adding more than one head to your lighting setup.
I highly recommend purchasing a flashmeter, as it will save you from going prematurely grey.