Generally, as long as the camera has a standard "hot-shoe," everything should work. The 2500 appears to be for an older camera though (because it only has one contact on the bottom and it uses a synchronization cord) I wouldn't use it (see: http://en.wikipedia.org/wiki/Hot_shoe )
If you still have the need for a zoom thyristor, I would try to find the 3500 model from Vivitar. It has the standard three contacts on the bottom and would probably work..... However, with a high-end camera such as this; be careful about accessories you use because you could accidentally damage it. If you're still in doubt, ask your local dealer about it....Hope this helps.
~Cliff
of coarse you can silly(:
You can find the manual for Vivitar Zoom Thyristor 2500 from the following website. just scroll down and find the model for which you need the manual. http://www.butkus.org/chinon/vivitar_flashes/vivitar_flash_units.htm
You can use it as an ordinary automatic flash, but the dedicated features such as TTL metering and auto-zoom will not work unless you have a flash specifically built for the Sony.
There alot of different variety brands for a night vision camcorder which are fun, examples are Sony, Panasonic, Canon, Samsung, Zoom, Vivitar, Carcams, Toshiba,
canon a560, canon a720, they have 4 x optcial zoom
i have canon sx100 which has a wonderful zoom option - 10x optical zoom
The alternative to the Canon A650 is Canon SD950. It has the same 12.1mp and its zoom is 3.7x.
The Canon S-series have great zoom and can even do digital zoom for distant objects.
digital cameras
Some of the features of the Canon Powershot A95 include: 5.0 megapixels, 12x combined zoom, 3x optical zoom, 4.1x digital zoom and direct printing capabilities.
A Canon teleconverter is used to extend the reach of your camera's zoom lens. The Canon teleconverter will let one zoom out a bit farther to get a closer picture of his subject. It's also used for saving money because a Canon teleconverter is a little cheaper than getting a brand new, more powerful zoom lens.
The Canon G5 is a digital camera with five megapixels, and optical zoom. It has a rechargeable battery and a zoom lens with autofocus. The Canon G5 is a high rated camera with many more special features.