The Vivitar 283 was manufactured in China & Japan over a number of years & the specifications did change over this period.
The older Vivitar flashes had a voltage on the shoe which could reach 150 volts whilst the later ones had voltages of only 5 to 9 volts.
If you have, or can get hold of, a small voltmeter then you can measure this voltage.
Turn on your flash & let the unit charge up to 'ready' & connect the meter between the contact in the centre of the shoe & the little contact tucked away in the lip of the shoe. (DC volts not AC) There is no danger to you in doing this!
This should tell the voltage on the shoe of your unit & if it is 15 volts or less, it will be fine with your digital Nikon camera. If more than 15 volts than best not to use it.
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This may be related to the CF card being used. The Nikon D70 and D70s are an older technology and supports most cards up to 1 GB in capacity. It can support a very limited number of cards up to 4 GB in capacity. Nikon has a list of support cards.
The list is old and I myself have used other brand cards without a problem - as long as they did not exceed 1GB in my old D70. I imagine many 2GB cards would work but beyond that - I would want to venture. Of course, sticking to the list is a sure bet.
Of course, it may just be a "bad" card - or it could be bent connectors in the camera - but it is unlikely unless you've forced a card into the slot in the past. Try with another card to be sure.
If the memory card came from a different camera and inserted into the Nikon D70, the error message will appear. Just format the memory card with the D70 and the error should disappear.
Hope this helps.
I had something very similar happen to me.
I now know what I did wrong.
I was using an older type lens that did not have electronic contacts.
I forgot to turn the camera off before I removed the lens and I believe this may have short-circuited the camera electronics.
I have to get the camera repaired at a cost of about £90 (sterling).
the nikon D80 has a 250 volts safe range and i have the same issue but readin on the internet i learned that yo can now the voltage of your flash with a voltage metter ond the hot soe.
Vivitar 283 has diferent ranges of voltages depending on the year of fabrication so older ones can achieve 300 volts and earlier have 230 volts so the best is to get a vivitar 285hv for about 75dollars or a safe sync for about 55dollars, you can find all on ebay or other brouser the safe sync converts up to 400 volts to a safe 6 volts that are yust the normal voltage for digital flashes.
The higher the ISO setting the more grain in the photo. Have you somehow set the ISO to say, 1600?
Select ISO setting this way:
Are you shooting in low-light situations (typically indoor)? Try shooting bright scenes and Auto mode, or manually set ISO to 100 or 200 and see if noise persists.