T2i Flash sync. speed in Av mode

Started Mar 19, 2010 | Discussions
Chrisd999
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T2i Flash sync. speed in Av mode
Mar 19, 2010

Coming from the 50D, I could set the external flash to sync with fixed shutter speed at 1/250th second through the custom function menu.

The T2i will let me set the flash sync to 1/200 only, which does not quite freeze the actions shots the same as 1/250 did.

Does anyone know a way to overcome this, or to set the flash sync speed manually to 1/250th or faster?

By the way, I am using the 430 EX I.
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guinness2
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Re: T2i Flash sync. speed in Av mode
In reply to Chrisd999, Mar 19, 2010

Regardless you can to set it or not, 1/250 will not be a SYNC speed anymore.
http://photonotes.org/articles/eos-flash/index2.html#xsync
T2i has simply max flash sync speed at 1/200s
This setting just says for Av mode, don't vary from 1/30s to max, just use max.

Wrote:

Coming from the 50D, I could set the external flash to sync with fixed shutter speed at 1/250th second through the custom function menu.

The T2i will let me set the flash sync to 1/200 only, which does not quite freeze the actions shots the same as 1/250 did.

Does anyone know a way to overcome this, or to set the flash sync speed manually to 1/250th or faster?

By the way, I am using the 430 EX I.
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Gena
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Re: T2i Flash sync. speed in Av mode
In reply to Chrisd999, Mar 19, 2010

If flash is your light source it doesn't matter what sync speed you use, the flash duration is much shorted anyway. Besides, what kind of action would be OK to shoot at 1/250 but is too slow for 1/200?

One example of high speed sync is at daylight when you can't lower your speed but still need flash for brightening the shadows.

Hundminen wrote:

Coming from the 50D, I could set the external flash to sync with fixed shutter speed at 1/250th second through the custom function menu.

The T2i will let me set the flash sync to 1/200 only, which does not quite freeze the actions shots the same as 1/250 did.

Does anyone know a way to overcome this, or to set the flash sync speed manually to 1/250th or faster?

By the way, I am using the 430 EX I.
--
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John_A_G
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clarification
In reply to Gena, Mar 19, 2010

Gena wrote:

If flash is your light source it doesn't matter what sync speed you use, the flash duration is much shorted anyway.

This would not be the case in aperture priority mode unless you dial in a lot of negative EC. To freeze motion, the flash does indeed need to be the primary if not only light source for the exposure. So the camera needs to have an exposure at least a stop below ambient to start freezing motion. You get pretty good freezing at about two stops below ambient. If the camera's metering is not underexposed there will be enough ambient light in the exposure to show motion.

So, if you want to freeze motion you really want to be shooting a manual exposure.

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Chrisd999
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Re: T2i Flash sync. speed in Av mode
In reply to Gena, Mar 19, 2010

Gena wrote:

If flash is your light source it doesn't matter what sync speed you use, the flash duration is much shorted anyway. Besides, what kind of action would be OK to shoot at 1/250 but is too slow for 1/200?

Here is an example:

As you can see, there is already a bit of motion blur with 50D.

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Lemming51
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M mode and set the 430EX for HSS.
In reply to Chrisd999, Mar 19, 2010

Hundminen wrote:

Coming from the 50D, I could set the external flash to sync with fixed shutter speed at 1/250th second through the custom function menu.

The T2i will let me set the flash sync to 1/200 only, which does not quite freeze the actions shots the same as 1/250 did.

Does anyone know a way to overcome this, or to set the flash sync speed manually to 1/250th or faster?

Yes, but not in Av mode.

By the way, I am using the 430 EX I.

Use M mode, set the aperture you want just like you do in Av and set the shutter speed you want. If the desired shutter speed is faster than 1/200 set the 430EX for FP High Speed Sync. Press the "lightning bold H"/ > > > button on the 430EX so that "lightning bolt H" is displayed on its LCD, p. 16 of the instruction manual.

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John_A_G
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see my post above
In reply to Chrisd999, Mar 19, 2010

Hundminen wrote:

As you can see, there is already a bit of motion blur with 50D.

And if you used 1/250 on the T2i you'd still have motion blur if you've got that much ambient light.

Here's an example of a shot at 1/60. Way too slow to stop motion, and yet even though the actor is running there is no blur.

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Gena
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Re: clarification
In reply to John_A_G, Mar 19, 2010

But of course,
1. If you need 1/200 you have to set it at 1/200, through TV or M

2. If you think the motion is blur is because of 1/200 then 1/250 is not going to help.

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BAK
BAK
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Re: T2i Flash sync. speed in Av mode
In reply to Chrisd999, Mar 19, 2010

I see sharp whiskers with no motion blur.

But I bet the camera was moving through the air when that picture was taken, trying to follow the cat.

BAK

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aVolanche
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Re: T2i Flash sync. speed in Av mode
In reply to BAK, Mar 19, 2010

Custom Function:
I-3: Exposure flash sync speed in Av mode

0: Auto
1: 1/200-1/60 sec auto
2: 1/200 sec (fixed-Av mode)

As suggested,use high-speed sync with that flash.

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John_A_G
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remember in HSS
In reply to aVolanche, Mar 19, 2010

that the flash output is drastically reduced. For a shot like the OP posted of the cat right in front that is not likely an issue. But for shots further away or on a high bounce you might find the flash power is not up to the task.

So, HSS will work in some instances but not others (like any other tool).

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Chrisd999
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Re: M mode and set the 430EX for HSS.
In reply to Lemming51, Mar 21, 2010

Thanks for that tip. I was looking in the camera manual for a way to increase the shutter speed faster than 1/200. Never thought to check the flash manual.

Anyway, I took several test shots of a moving fan, which illustrate how the lower shutter speeds allow the available light to cause motion blur. But then, something strange happens where it seems there is more motion blur at 1/250 or 1/400 than 1/200. Goes against logic. Then at 1/1600 all motion is frozen again.

I'm curious why 1/200 looks better than 1/250 or 1/400 here.

1/40:

1/200:

1/250:

1/400:

1/1600:

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