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 Canon S-series have great zoom and can even do digital zoom for distant objects.
The alternative to the Canon A650 is Canon SD950. It has the same 12.1mp and its zoom is 3.7x.
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.