I just saw a post on another site.
1. Change to manual mode
2. Rotate past 30 seconds and bulb.
3. The next shutter speed after bulb is X320 or X250 depending upon your flash settings.
I'm baffled. What is this? I am well aware of the the high speed flash sync settings for the CLS system and have mine set at 1/320, but I would never have thought to switch into manual mode to see how low of a shutter speed I could dial in. On the other hand, I would never have expected to see x250 or x350 when I got to the end.
I took a couple of shots at x320, (without flash,) and it was the same exposure value as 1/320 without the x in front of it.
#2. "RE: What is x250 or x320" | In response to Reply # 1Fri 20-Aug-10 10:11 PM
Thanks Marty, but why?
Why would Nikon design this into a camera. Is there a reason or a purpose for this? Who would think of doing this? Would anyone say, I'm in manual mode and I want to set my shutter speed to 1/320, so I'm going to crank my dial lower than bulb so that I can get to 1/320?
#3. "RE: What is x250 or x320" | In response to Reply # 2MEMcD Nikonian since 24th Dec 2007Sat 21-Aug-10 03:14 AM
The X Sync has been Nikon and other camera brands shutter speed dials back to the Nikon F3 and the likely the rangefinders before that. It has been a fixture on camera bodies for a very long time. In other words it has been there forever and there is no reason to change.
Good Luck and Enjoy your Nikons!
#4. "RE: What is x250 or x320" | In response to Reply # 2voyageurfred Nikonian since 20th Jun 2007Sat 21-Aug-10 03:40 AM | edited Sat 21-Aug-10 07:35 PM by voyageurfred
As Marty has already stated, this is the shutter sync speed. Go above this to say 1/500 or 1/1000th of a second while using a flash and the shutter will already have started to close by the time the light output from the flash hits the subject and reflects back to make the exposure on the sensor.
The result at these higher shutter speeds would be a black vertical bar partially obscuring the frame on either the left or right side. The bar is the shutter starting to close.
So most quality manufacturers provide the manually selectable shutter sync speed for those photographers who need the highest speed possible, before the shutter starts obscuring the image.
Try some indoor or outdoor photography yourself and confirm the effect. Think about what kind of subjects you would need a high speed sync for. How about humming birds, flying bees, freezing falling water droplets, etc, etc.
Frederic in Montréal
Nothing ventured... nothing gained!
#5. "RE: What is x250 or x320" | In response to Reply # 0
I wrestled with this issue all morning, and I think that Marty’s answer comes closest, “just because it’s there.” It’s certainly not a necessary setting. The only other reason that I can think for dialing it in is if you are uncertain or don’t recall how you set “e1.” And, of course, it is only available in M or S mode. In either of these two modes, and while the built-on flash is up, the ultra intelligent D700 won’t let you shoot faster than your “e1" setting anyway.
Frederic, like you, I also have the SB900, and when set correctly, you can use your flash at any shutter speed up to 1/8000 of a second without the “black bars” that would be present in days of yore.
I’ve had Nikon School’s “A Hands-on Guide to Creative Lighting” sitting on my coffee table for about three months. I think that it’s about time that I watch it, so that I don’t have to pose these worthless questions anymore. Then, maybe I’ll wander over to the Speedlight forum
Thanks for your comments.
#6. "RE: What is x250 or x320" | In response to Reply # 5voyageurfred Nikonian since 20th Jun 2007Sat 21-Aug-10 07:51 PM | edited Sat 21-Aug-10 07:52 PM by voyageurfred
"I’ve had Nikon School’s “A Hands-on Guide to Creative Lighting” sitting on my coffee table for about three months. I think that it’s about time that I watch it, so that I don’t have to pose these worthless questions anymore."
No question is ever worthless, if you don't know or are not sure what the purpose is of a certain camera function, or any other subject for that matter. I'm always learning something new every day and often ask what some may consider odd questions too.
And while indeed the SB900 can fire at much higher shutter speeds, for those Nikonians who may be using older flashes such as the SB800 (which I also use) the SB600 or even flashes triggered remotely using a photocell detector (I have an older Vivtar 285HV used this way), then the flash sync speed is very relevant, as older flashes have a slight delay before the light pulse is triggered.
Have fun with your flash!
Frederic in Montreal
Nothing ventured... nothing gained!