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How-to's

Why use Camera Manual with Flash Indoors?

Russ MacDonald (Arkayem)


Keywords: nikon, speedlights

I am often asked why you should use your camera in Manual Mode when shooting flash in low ambient conditions, and why is that better than shooting in Aperture priority. This study will explain the reasons, plus I will show the effects of Rear Sync versus Front Sync when there is any subject motion involved in flash pictures.

But first it is important to fully understand that when you use your camera in Manual mode and your flash in i-TTL, the flash handles the exposure of the subject, as long as the ambient is dim, and the subject is in the center of the frame. So the image is still exposed automatically even though the camera is in Manual mode.

Here are my conditions that do not change during this study:
- Dim ambient light
- ISO 400
- f/2.8

Image 1 below: Test Image, Flash off, 1/60th, Manual Mode.
The purpose of this image is to indicate how much ambient light there is. You can see that at 1/60th, it is about two stops underexposed. When using the camera in Manual mode and the flash in i-TTL mode, you want the camera controls to always underexpose the ambient by about two to three stops. Also, I moved my hand, so you can see what motion blur looks like without the flash.

 

20130923_081751_17.image_1.jpg
Test Image, Flash off, 1/60th, Manual Mode.

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17 comments

Steve White (boogie34950) on January 1, 2017

Thanks again.

Bob Arkow (Bob Arkow) on January 16, 2016

Interesting article, Thanks. Bob

Preston Moochnek (massulo) on June 12, 2015

Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014 Laureate Ribbon awarded for winning a Nikonians Annual Photo Contest

Excellent article

Henry M. Ford (Team) on January 20, 2015

I'm really enjoying my membership.Big Thanks

Mark Cremona (MarkCremona) on November 7, 2014

great little refresher for us Pro's too. Thank you.

Doug Murphy (Douglas1) on October 2, 2013

Thank you , thank you. No more Aperature priority and 1/60 sec speeds

Robert de Jonge (RobertS46) on September 30, 2013

At last someone who can it explain in simple term and very clear.Tonight I will do some experiments. Thanks !!!!

Tim Marchant (timpsm) on September 28, 2013

Yow, look at that . . . when I select rear sync and release the button the display shows slow sync also selected . . . I never noticed that and I never knew what slow sync was used for . . . okay, back to the manual for another read . . . thank you Russ

Jim Troxell (FFN) on September 26, 2013

Donor Ribbon. Awarded for his generous support to the Fundraising Campaign 2014

This kind of article is why I subscribe to Nikonians. Thank you.

Clay Olmstead (clayolmstead) on September 26, 2013

The pictures make this clear. The bit about slow sync in aperture priority might explain some missed shots. Thanks once again, Russ!

George McLelland (georgemc) on September 25, 2013

Thank you very much. I have had trouble with this. Now I know (I hope). I'll experiment.

DONALD J MCKAY (djmckaytx) on September 25, 2013

Thanks for this...

David Ziff (davidziff2) on September 25, 2013

I'm a professional photo-journalist shooting events and I always shoot auto flash with manual settings. Not sure why you're discussing rear or front sync at all. The usual mode is manual flash with auto flash. I'm not challenging your position here. I just don't understand it

Verne Wonderlich (Cowboy Charley) on September 25, 2013

Excellent, very informative giving and showing the why and why not theory .

Conny Eriksson (Mindmeld) on September 25, 2013

Nice info, thank you :)

Richard Luse (DaddySS) on September 24, 2013

Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014 Donor Ribbon awarded for his generous support to the Fundraising Campaign 2015

Thanks Russ, well done and informative.....again!

Y V Tyagi (yvtyagi) on September 23, 2013

Some camera models offer an option of choosing slowest shutter speed when using TTL flash (like D800E). Would there still be any difference if A or P mode is used in flash photography in low ambient light?

G