I was interested that you use the Vivitar 283 with the R-D1. I have 5 old ones myself, but won't risk using them on the R-D1 without a Wien Safe Sync. I had an e-mail from another RFF member today about measuring flash voltages as I had noted in a post that all my 283's were high voltage, so am curious how you are using yours.
Are you using your 283 with the Wein safe sync or have you measured your 283's voltage and found it OK.
http://www.botzilla.com/photo/strobeVolts.html indicates quite a range of voltages for 283's, but most old ones are high. As I recall all mine measured over 200 volts. I was not inclined to risk anything over 25 volts straight on the R-D1.