Author Topic: High speed sync ... (Read 1760 times)

Anandarajkumar · « **on:** July 15, 2011, 09:23:57 AM »

Hi friends,

Is there any way (firmware hack) for a high speed sync for Canon 400D? I understand it should be a combination of both camera and flash, but still I would like to know is there any way to increase the shutter speed from the 1/200 when Flash is on.

When my Nissin 622 Di is connected to the camera, in manual mode of the flash, the shutter speed could be adjusted but when I half press/press the shutter release button, it comes to 1/200 only.

Please help me if there is a feasibility for the existing setup to have higher shutter speeds with flash on?

toofan · « **Reply #1 on:** July 15, 2011, 10:03:18 AM »

In manual mode you should be able to fire the flash at any shutter speed you want. But you will get a black band over the speeds of 1/200. If its not working try to put the flash in manual mode too.

lightwave · « **Reply #2 on:** July 15, 2011, 10:53:43 AM »

If flash supports HSS then blaxk bamd will not come.
Anand are you able to set shutter faster than 1/200 on cam with cam in Manual mode?

Anandarajkumar · « **Reply #3 on:** July 15, 2011, 11:24:30 AM »

Vimal and Doc:
When I keep my Nissin in manual mode, I could set shutter timing upto 1/4000 too, and it shows in the LCD. But the moment I press the 'shutter release' button either to autofocus or to click, the speed becomes to 1/200 only.

lightwave · « **Reply #4 on:** July 15, 2011, 01:09:39 PM »

You are referring to shutter speed on the Cam correct? If you set it to 1/4000 it will fire at 1/4000. Only the photo will have dark band if flash is not set to high speed sync.
Frankly I do not think the 622 model has HSS feature. So the flash will only sync till 1/200.

Anandarajkumar · « **Reply #5 on:** July 15, 2011, 01:11:23 PM »

Yes, I am referring to the shutter speed at cam only doctor. But then why it shows immediately 1/200 the moment I press the 'click' button? However let me do more experiments. And yes, the flash has no HSS feature.

toofan · « **Reply #6 on:** July 15, 2011, 03:27:18 PM »

Anand: On camera May be the Cam mechanism will not allow the flash to fire over 1/200. Try it off camera. It will surely work.

Madhav Bhakta · « **Reply #7 on:** July 15, 2011, 05:19:02 PM »

Quote from: Anandarajkumar on July 15, 2011, 01:11:23 PM

Yes, I am referring to the shutter speed at cam only doctor. But then why it shows immediately 1/200 the moment I press the 'click' button? However let me do more experiments. And yes, the flash has no HSS feature.

In Canon dslr the shutter sync will be automatically reset to 1/200 even it is set to higher by the user. It is to avoid the banding in the final picture.

Anandarajkumar · « **Reply #8 on:** July 15, 2011, 05:21:25 PM »

Quote from: toofan on July 15, 2011, 03:27:18 PM

Anand: On camera May be the Cam mechanism will not allow the flash to fire over 1/200. Try it off camera. It will surely work.

Off camera with ttl cable also I tried to find the same.

Madhav Bhakta · « **Reply #9 on:** July 15, 2011, 05:27:46 PM »

http://www.rpphoto.com/howto/view.asp?articleID=1026

may be this one helps.

Beyond Legacy · « **Reply #10 on:** July 15, 2011, 05:53:16 PM »

http://youtu.be/JNYUXmN_wcQ

Secret exposed..

Anandarajkumar · « **Reply #11 on:** July 15, 2011, 10:13:36 PM »

Thanks Bhakt and Beyond Legacy.
Bhakt: My question is with the given setup how do I increase the exposure time. That is not answered there

Beyond Legacy: This shows in Nikon I think, he changes as normally we change the exposure time. That I can do anytime, but with flash connected that does not happen. If happens with Nissin when off cam, but the moment I touch the 'click' button it comes back to 1/200.

And I am now standing at where I started... Help please sirs...

lightwave · « **Reply #12 on:** July 15, 2011, 11:06:45 PM »

This is a mystery for me. I had shot with External flash when I had 500D and it would let me shoot in Manual mode with speed set to faster than 1/200 sec but I would get black banding in the pic. But the camera itself resetting to 1/200 did not occur. Probably ther emust be some Custom Function (C.Fn) that you have set to do this. One can set the cam to fire at 1/60 or 1/200 in Av mode in one of the C.Fns. Maybe try a reset all camera settings and go again keeping camera in Manual mode. But what will you chieve? Even if cam does fire faster than 1/200, as 622 doesn't have HSS, the black band problem will occur isn't it?

ArindomRC · « **Reply #13 on:** July 15, 2011, 11:32:52 PM »

Any possibility to remove the black banding??? even I have observed it with my 285hv which is completely manual lens

Hankosaurus · « **Reply #14 on:** July 16, 2011, 12:32:25 AM »

I think Doc hit it.

If the flash cannot burn for a time exceeding the transit time for the curtains (not a "fast sync" flash), then part of the frame will be unexposed, as the lamp will already be off when the open slit between the curtains passes across some part of the sensor plane. The flash pulse will have come and gone, with part of the sensor still covered by a curtain.

The transit time for the curtains is approximately the same as the so called sync speed, 1/200 or thereabouts with the shutter being discussed. But that flash pulse is much shorter/faster.

I'm guessing that the camera has a "protective feature" to make sure that the whole recording surface is simultaneously uncovered when the very short light pulse of a simple flash goes off. Otherwise the band discussed would be present.

Many older cameras do not have this "intelligence."

toofan · « **Reply #15 on:** July 16, 2011, 04:17:46 AM »

The cams with electronic shutters or CCD sensor.

Hankosaurus · « **Reply #16 on:** July 16, 2011, 08:20:56 AM »

Quote from: toofan on July 16, 2011, 04:17:46 AM

The cams with electronic shutters or CCD sensor.

Hi Vimal.

Yes, those cameras which can use the sensor as a shutter can sync at speeds higher/shorter than the shutter curtain transit time. Nikons D40 and D70 are examples. There are others using CCD sensors which can do this.

And, of course, the classic leaf shutter can sync at any speed (e.g. Hasselblad 500c). But not cameras we have which depend only upon the curtains to determine exposure time at the recording surface.

Anandarajkumar · « **Reply #17 on:** July 18, 2011, 02:11:56 PM »

Thanks Henry and Doc. I would like to go not very much away from 1/200 but in the near vicinity to control sometimes the light for my glaring fishes.

Quote from: rcarindom2003 on July 15, 2011, 11:32:52 PM

Any possibility to remove the black banding??? even I have observed it with my 285hv which is completely manual lens

Banding I think we can remove by cropping!

Hankosaurus · « **Reply #18 on:** July 18, 2011, 11:23:34 PM »

Quote from: Anandarajkumar on July 18, 2011, 02:11:56 PM

Banding I think we can remove by cropping!

I see the "

" symbol there, so I guess you are kidding, Anand.

With some cameras, one stop faster than "sync" speed could have a curtain covering about half of the frame. Two stops could have a curtain covering about three fourths of the frame. Three stops could have a curtain covering about seven eighths of the frame ... and so on.

I think you need a better solution than that one.

ArindomRC · « **Reply #19 on:** July 18, 2011, 11:35:27 PM »

Quote from: Anandarajkumar on July 18, 2011, 02:11:56 PM

Thanks Henry and Doc. I would like to go not very much away from 1/200 but in the near vicinity to control sometimes the light for my glaring fishes.

Quote from: rcarindom2003 on July 15, 2011, 11:32:52 PM
Any possibility to remove the black banding??? even I have observed it with my 285hv which is completely manual lens

Banding I think we can remove by cropping!

I guess this pun helps someone out there, sadly it didnt help me :s .... If you dont have a idea, please dont use it to create sarcasm for nothing...

Many people here do have a first time for everything, me too . But i see the dark side of the humor is becoming a dominant factor in this forum. Share knowledge that will help make it a better place, not some useless pun.

Regards,
Arindom

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Author Topic: High speed sync ... (Read 1760 times)