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06/27/2005 01:35:54 PM · #1 |
| How fast can I go? I seem to be limited to 1/200sec even if I use the H-sync mode on Flash while in Av mode. Is there a way to get faster ? Am I missing something ? |
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06/27/2005 01:39:43 PM · #2 |
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06/27/2005 01:44:30 PM · #3 |
| Haven't tried the full Manual mode yet. The Flash user-manual talked about using the H-Sync in Av mode to get faster shutter speeds, but I wasn't able to do that. I am not very used to the Manual mode in camera yet :( |
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06/27/2005 01:46:11 PM · #4 |
| perhaps in AV mode, I'm really not sure. |
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06/27/2005 02:22:52 PM · #5 |
| As far as i know, there is no way to shoot faster with flash than the flash sync speed for each camera, so canon dslr d series(10,20,300,350) is 1/200, nikon i.e. is 1/500. |
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06/27/2005 02:26:02 PM · #6 |
As a matter of fact u CAN. And u're doing it the right way.
At least on my 350D with the 580ex i can do that, simply by using the FP button on the flash (u'll get an "H icon with a little bolt thingie" on the LCD.
Fill-flash....... |
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06/27/2005 02:30:10 PM · #7 |
You may want to check C.Fn 03 ("Flash sync speed in Av mode") on your 10D, it could be set to 1 ("1/200 sec. (fixed)") instead of 0. Enabling FP sync mode on the flash should definitely allow you to go above the 1/200th cross-sync speed, at the expense of reduced flash output because of the strobing nature used in FP sync mode.
(FWIW, I leave FP sync enabled all the time; if the shutter speed is at or below the cross-sync speed, the flash behaves "normally", even if FP sync is enabled.)
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06/27/2005 02:33:00 PM · #8 |
additional info:
FP mode, also known as focal plane mode or high-speed sync, is a way of circumventing a cameraâs X-sync limitation. FP flash lets you take flash photos at any shutter speed you like, and works by pulsing the flash bulb at an extremely high rate - 50 KHz - simulating constant light at the cost of total light output. FP stands for âfocal plane,â by analogy to the old FP flash bulbs, though a convenient way to think of it is âfast pulse.â
Only E-TTL capable (type A) EOS cameras support FP mode. (except the EOS 1N, which can partially support FP mode flash via an optional upgrade)
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06/27/2005 04:51:30 PM · #9 |
| Thanks everyone for the info. I will try to look up the Custom function once I get back home. |
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06/27/2005 06:01:44 PM · #10 |
Why do you want a faster shutter speed?
Is the flash the primary light source?
The more light you need, the longer the flash bulb is lit - anywhere form 1/30,000 sec to 1/1000 sec. if the flash is the only light source, then you can stop a bullet in flight at 1/30 shutter speed. Camera shake is not as issue either.
If the flash is to aid in lighting, then distance becomes a very big factor. In regular flash mode, the GN rating will tell yo how far out you can in theory light things up. So a GN of 54 (meters) will let you light up a subject 150 feet away (or thereabouts).
In FP mode (or H sync, etc) what teh flash does is strobe - it takes the power available and divides it up into lots of little flashes - this makes the GN rating MUCH lower.
The issues is the shutter is actually just a slit that moves over the sensor. Since the flash duration is SOO short, the light never reachees the entire sensor so you will get some really weird pics, none of which will be useable.
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06/27/2005 06:34:16 PM · #11 |
Originally posted by Prof_Fate:
Why do you want a faster shutter speed?
In FP mode (or H sync, etc) what teh flash does is strobe - it takes the power available and divides it up into lots of little flashes - this makes the GN rating MUCH lower.
The issues is the shutter is actually just a slit that moves over the sensor. Since the flash duration is SOO short, the light never reachees the entire sensor so you will get some really weird pics, none of which will be useable. |
One of the biggest uses for FP flash is shooting in bright light, with a wide aperture and using the flash for fill.
In bright sun at ISO 100 and a sync speed of 1/250, you are limited to shooting at ~f11. That will give you a LOT of DOF.
If you shoot at a shutter speed higher than the sync speed (without FP), the flash will just not illuminate part of the frame and it will be dark.
FP is a very useful thing, when you need it, but it kills the reach on your flash and eats batteries.
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06/27/2005 07:46:58 PM · #12 |
Did I mention I love my D70?
I can sync my flash at 1/500, or with my Alien Bee flash and a sync cord I can sync at 1/8000.
So.... Who's switchin' to Nikon? :-)
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06/30/2005 03:32:20 AM · #13 |
Originally posted by rkfoote:
Did I mention I love my D70?
I can sync my flash at 1/500, or with my Alien Bee flash and a sync cord I can sync at 1/8000.
So.... Who's switchin' to Nikon? :-) |
ummmm not me
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