Auto F stop with flash in Shutter Mode D750: As a rule I shoot in manual and a occasion I use Aperture with a flash outdoor and indoor, I use Shutter speed outdoors if the lighting is...

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Auto F stop with flash in Shutter Mode D750

Jun 26, 2017 03:06:50 #

greg14

As a rule I shoot in manual and a occasion I use Aperture with a flash outdoor and indoor, I use Shutter speed outdoors if the lighting is good or for sports without a flash.

As I am older, I decided to try and use Shutter speed with a flash for fill, I noticed that the camera with go to the widest F stop, 1.8, 4 etc.
Is there something I am missing or not doing correctly to avoid this ?
I realize that common sense says that the Camera thru the lens needs to allow for maximum light, hence the reason for the wide f stop.
BUT, is there a way to get the camera to recognize that there is an active flash attached in shutter mode.

Hope I do not cause a "you are an idiot" response, I have been taking pictures for over 60 years and it never occurred to me to figure this out.

Jun 26, 2017 03:54:27 #

TriX Loc: Raleigh, NC

One option is to shoot in manual with the flash set for ETTL. Then you can set shutter speed and aperture as you wish, and the flash will adjust the light output for what the flash "thinks" is the proper exposure. You can make further adjustments to the exposure with the flash compensation if desired.

Jun 26, 2017 03:57:12 #

greg14

I do currently shoot in Manual with the flash set at TTL, not sure what ETTL is, I have the Nikon SB910

Thanks,

Greg

Jun 26, 2017 05:48:17 #

BebuLamar

ETTL is only for Canon. For Nikon it's iTTL. To answer the OP I don't know when in P and S how the camera choose the aperture. On my old film F5 camera there was a chart and it based on the maximum aperture of the lens. On my Df (and I imagine the same for your D750) there is no chart in the manual.

Jun 26, 2017 06:05:05 #

When you set the shutter speed were you within the flash sync speed range? It's most likely 1/200-1/60 second or 1/250-1/60 second. I'm not sure if that could be the problem.

Jun 26, 2017 06:41:54 #

stillducky

greg14 wrote:

As a rule I shoot in manual and a occasion I use A... (show quote)

I never use Shutter priority mode with my d750 so I tried it with and without an external flash. It worked the same way on mine. The camera used the aperture first maximizing it at 2.8. It behaved the same way without the flash. If I lowered the shutter speed enough the aperture will change. It appears it is just the nature of the beast.

Have you tried setting the flash from ittl to manual for flash fill? For fill I usually set the flash to manual at 1/128 to 1/16 power and the camera to shoot in Manual mode. I use fill flash to brighten the subject slightly which will darken the background. First I will adjust the camera with flash off so the background brightness is where I want it. Then I turn on the flash (hi speed mode) and guess where to set the power.

Jun 26, 2017 12:29:32 #

greg14

(1)
Yes, I keep it within the flash Range

(2)
I rarely if ever use Manual Flash, too old and I might forget to reprogram, LLOL

Jun 27, 2017 06:18:19 #

OnDSnap Loc: NE New Jersey

You may want to take a look at this, a well worth read for D750 owners. Nikon D750 Guide by Thom Hogan...especially the section in your case "Flash" pages 681-748
http://www.dslrbodies.com/books/bythom-complete-guides-/nikon-d750-guide.html

Jun 27, 2017 09:00:35 #

Bullfrog Bill Loc: CT

You are not an idiot, that is hoe it works. To overcome this, go to manual, meter the scene, select speed and arperture and set flash to TTL.

Jun 27, 2017 09:05:56 #

BebuLamar

OnDSnap wrote:

Do you have the book? Can you just tell the OP what it is? I am curious as I don't know either. I always shoot flash with the camera in M mode but the OP question is something worth to know.

Jun 27, 2017 10:05:50 #

GLKTN Loc: TN

I am currently trying to figure out how to use speed flash with my new d750. I am also a brand new at photography, period. There are many youtube videos on ttl speed flash setup and use. Very helpful. Good luck.

Jun 27, 2017 17:16:42 #

greg14

I have the "Mastering the Nikon D750" by Darrell Young from NikoniansPress
I will reread it when I get a chance.

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