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Auto FP High Speed Sync mode - Nikon F6 + SB-800 flash
I stuck the following on a Nikon mailing list, but I thought I'd try
here too. Hi, I have an F6 and in the instructions it says you can use high shutter speeds (up to 1/8000th sec) in "Auto FP High Speed Sync mode" if used with an SB-800 (perhaps some other speedlights too, but definitely the SB-800). Well I have the SB-800 and the F6. If I set the flash mode to 1/250FP as it says in the F6 manual, I can set the shutter speed to anything I want. But as soon as the SB-800 is attached, so the indicated speed drops to 1/250. The SB-800's manual says these high speed modes must be set on the camera, not on the flashgun. Also, reading the SB-800's manual, it says the duration of the flash is as follows: 1/1050 at M 1/1 (full output) 1/1100 sec at M 1/2 output. 1/2700 sec at M 1/4 output 1/5900 sec at M 1/8 output 1/10900 sec at M 1/16 output .... 1/41600 sec at M 1/128 output So it seems to me that unless the output is somewhere between 1/8th and 1/16th of full output (or less), the length of the flash will be 1/8000th of second, so it seems unlikely you could ever use 1/8000 except perhaps at very close distances. But I can't get the shutter speed to indicate anything faster than 1/250th, no matter what I do. I even changed the ISO of the film as if I was rating it at some huge ISO (whatever the maximum supported on the F6 is), but still no joy. I thied this on an 20mm f/2.8 and the 70-200 f/2.8 VR lenses. It's probably me reading the manual wrong, as my last Nikon was an F3 which was ever so slightly (well quite a lot really) less complex than the F6. And the SB-800 is a pretty complex bit of kit too. BTW, does anyone know why the duration of the flash differs so little (1/1050th vs 1/1100th sec) going between full and half output? At anything under 1/2th output, the duration gets much shorter, but above that, the duration remains the same. I'm just interested in how they control the output level. (This is my science/engineering background being inquisitive). dave |
#2
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For my D1H , you just set the mode to M [manual] set the desired shutter
speed n aperture, set the SB-80DX speedlight mode to M ... then adjust the power til it indicates FP. Then flash away =bob= "Dave" wrote in message ... I stuck the following on a Nikon mailing list, but I thought I'd try here too. Hi, I have an F6 and in the instructions it says you can use high shutter speeds (up to 1/8000th sec) in "Auto FP High Speed Sync mode" if used with an SB-800 (perhaps some other speedlights too, but definitely the SB-800). Well I have the SB-800 and the F6. If I set the flash mode to 1/250FP as it says in the F6 manual, I can set the shutter speed to anything I want. But as soon as the SB-800 is attached, so the indicated speed drops to 1/250. The SB-800's manual says these high speed modes must be set on the camera, not on the flashgun. |
#3
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For my D1H , you just set the mode to M [manual] set the desired shutter
speed n aperture, set the SB-80DX speedlight mode to M ... then adjust the power til it indicates FP. Then flash away =bob= "Dave" wrote in message ... I stuck the following on a Nikon mailing list, but I thought I'd try here too. Hi, I have an F6 and in the instructions it says you can use high shutter speeds (up to 1/8000th sec) in "Auto FP High Speed Sync mode" if used with an SB-800 (perhaps some other speedlights too, but definitely the SB-800). Well I have the SB-800 and the F6. If I set the flash mode to 1/250FP as it says in the F6 manual, I can set the shutter speed to anything I want. But as soon as the SB-800 is attached, so the indicated speed drops to 1/250. The SB-800's manual says these high speed modes must be set on the camera, not on the flashgun. |
#4
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Dave wrote:
I stuck the following on a Nikon mailing list, but I thought I'd try here too. Hi, I have an F6 and in the instructions it says you can use high shutter speeds (up to 1/8000th sec) in "Auto FP High Speed Sync mode" if used with an SB-800 (perhaps some other speedlights too, but definitely the SB-800). Well I have the SB-800 and the F6. If I set the flash mode to 1/250FP as it says in the F6 manual, I can set the shutter speed to anything I want. But as soon as the SB-800 is attached, so the indicated speed drops to 1/250. The SB-800's manual says these high speed modes must be set on the camera, not on the flashgun. Also, reading the SB-800's manual, it says the duration of the flash is as follows: 1/1050 at M 1/1 (full output) 1/1100 sec at M 1/2 output. 1/2700 sec at M 1/4 output 1/5900 sec at M 1/8 output 1/10900 sec at M 1/16 output ... 1/41600 sec at M 1/128 output So it seems to me that unless the output is somewhere between 1/8th and 1/16th of full output (or less), the length of the flash will be 1/8000th of second, so it seems unlikely you could ever use 1/8000 except perhaps at very close distances. But I can't get the shutter speed to indicate anything faster than 1/250th, no matter what I do. I even changed the ISO of the film as if I was rating it at some huge ISO (whatever the maximum supported on the F6 is), but still no joy. I thied this on an 20mm f/2.8 and the 70-200 f/2.8 VR lenses. High speed flash is spread out in little pulses (unlike normal flash which is an uncontrolled discharge up to the point where the TTL shuts it off.) High speed flash: http://www.photozone.de/bindex3.html For 'normal flash', the discharge curve goes from 0 to full power very quickly, so for the lowest power, the flash has to be stopped before full discharge rates occur. That is why a plot of the timings above is so skewed. Here is a link for both high speed and TTL flash. http://www.chem.helsinki.fi/~toomas/...flash-faq.html http://www.chem.helsinki.fi/~toomas/...discharge.html It's probably me reading the manual wrong, as my last Nikon was an F3 which was ever so slightly (well quite a lot really) less complex than the F6. And the SB-800 is a pretty complex bit of kit too. BTW, does anyone know why the duration of the flash differs so little (1/1050th vs 1/1100th sec) going between full and half output? At anything under 1/2th output, the duration gets much shorter, but above that, the duration remains the same. I'm just interested in how they control the output level. (This is my science/engineering background being inquisitive). See the link above. Will answer much. -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
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