daniel_r wrote:The 5 batteries (800) over 4 (600) give a bit of an edge in the cycle times, and the extra grunt comes in handy...
...The main advantage of the 800 over the 600 if you're planning on using it for weddings/occassiona photography is the ability to add an external battery pack to boost recycle times. On the other hand, if you're doing paid work and representing yourself as a professional, you'll need to consider having backup gear / second body+flash combo anyway (not for looks, but so you don't find yourself up a particular creek without second paddle).
there is a big
______________________________________________________________ GAP between the recycle time in the SB600 (4xAA) to SB800 (5xAA, and likely electronics reasons too).
share with you an example from my experience, one with SB600 ('cause I thought I would save the $200 difference), one with the SB800 (purchased after self kicking). I noticed many of my shots with the SB600, from a todler shoot last year, were either well under exposed, or well under exposed. For some reason, the shutter will fire, regardless of flash charge, leading to under exposed shots, about 20%. In particular, with kids, running all over the place, or not "posing" for us, we may need to reshoot a shot just a blink after eachother, and the SB600 simply could not keep up (dont get me wrong, its a very good flash, but...).
then...
Sunday, shot a portrait session for a family, which included a very special moment for their 8 month old daughter, and I had SB800s with me. I purchased them because I was not ahppy with missing 20% shots (as above) due to underexposure... the SB800, with the 5th battery was able to recharge fast fast fast. I all exposures were BANG ON. shooting an event like a wedding, one could add an external battery pack, later, and you can go a day without a battery change...
what if the money shot was one of the underexposed shots??? I know I hated them, and remember, "the sweetness of a cheap price, is long forgotten when you're enjoying the bitterness of poor quality".
dont kick yourself, get the SB800.