View Full Version : Vivitar 285HV Disassembly

Bill Markwick
04-26-2007, 03:33 PM
The Vivitar 285HV is a great flash, and really economical, but it has an oddity: both the auto and manual ranges are Full, 1/2, 1/4, 1/16. What happened to 1/8? And where is the minimum, which is 1/30 (pretty close to one stop)?

It turns out that they economized by restricting the auto range (which slides neutral density filters over the sensor) and the manual (which applies different resistors to pins 2 and 3).

I've worked out and tested a new range switch for it, but now I have to take it apart without damage to install permanent connections. I don't want to damage anything by prying at it.

Anybody have any experience at disassembling these? (And even more important, re-assembling :p ). When I'm finished I'll post complete info on my results on expanding the range.