Originally posted by: soydios
IIRC Canon and Sony have wireless flash systems, but I have absolutely zero idea how they work. Can any Canon or Sony shooters chime in here? I'm curious.
I'm probably not the best person to answer as I never use flash but I'll try to give you a start & some links to further your research.
People on boards like the DPReview Sony SLR forum & Dyxum.com will be able to give you better answers.
The Minolta/Sony system uses the camera's built in flash for control
http://www.friedmanarchives.com/flash.htm.
(bear in mind that article is a couple of years old now & it's an improving/moving target e.g. I'm pretty sure that the new Sony HVL-F58AM allows for some things that previous Minolta/Sony flashguns didn't).
Originally posted by: Muse
Imaging-Resource says it has a "proprietary flash hotshoe." I guess this means I'd be limited in my choice of external flash devices.
afaik the Minolta/Sony hotshoe isn't proprietary but is in fact an open standard but for some reason they were the only people to actually implement it.
http://keppler.popphoto.com/bl...07/01/shoe_fetish.html
You can get dedicated flashes for Minolta/Sony from other manufacturers like Metz & Sigma.
You can also get adapters to allow for standard hotshoe equipped flashes to fit onto the Minolta/Sony mount & vice versa.
This also means that it is possible to use other wireless flash control systems (poppers?).
Other than for extreme pixel peeping you aren't likely to notice any difference between IQ of any of the current equivalent spec. DSLRS used with equivalent quality lenses - they are all good.
As for ISO1600 other than just playing to see what it was like I have used it exactly twice in 25 years plus of using SLRs. Once on a wet & blustery late afternoon last December (it gets dark here ~3PM then) when I actually gave up due to the weather & once the other night (~11PM> ) at the Edinburgh Tattoo (& to be strictly accurate I used 800ISO +1 exp. compensation then because on the A700 some extra NR kicks in if set to 1600 or more).
Now, I am perfectly willing to believe that I am atypical but I don't believe that the majority of people really use ISO 1600 at all regularly (for balance there will of course at the other end of the spectrum be some people who specialise in fields that require it almost all the time).
If you are going to get serious about your photography you will almost certainly end up shooting RAW & post processing & then it will become a non-issue.