T2i Flash sync. speed in Av mode

Started Mar 19, 2010 | Discussions
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Chrisd999
Chrisd999 Contributing Member • Posts: 886
T2i Flash sync. speed in Av mode

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
guinness2 Veteran Member • Posts: 4,019
Re: T2i Flash sync. speed in Av mode

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.
--
http://www.flickr.com/photos/chrisd666/

Gena Senior Member • Posts: 1,264
Re: T2i Flash sync. speed in Av mode

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.
--
http://www.flickr.com/photos/chrisd666/

John_A_G Veteran Member • Posts: 7,199
clarification

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.

Chrisd999
Chrisd999 OP Contributing Member • Posts: 886
Re: T2i Flash sync. speed in Av mode

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
Lemming51 Forum Pro • Posts: 14,079
M mode and set the 430EX for HSS.

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 Veteran Member • Posts: 7,199
see my post above

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.

Gena Senior Member • Posts: 1,264
Re: clarification

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.

BAK Forum Pro • Posts: 20,781
Re: T2i Flash sync. speed in Av mode

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

aVolanche Veteran Member • Posts: 3,646
Re: T2i Flash sync. speed in Av mode

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 Veteran Member • Posts: 7,199
remember in HSS

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).

Chrisd999
Chrisd999 OP Contributing Member • Posts: 886
Re: M mode and set the 430EX for HSS.

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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