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Forums Lobby MASTER YOUR TOOLS - Hardware & Software Nikon Speedlights & Lighting topic #59892
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Subject: "RE: SB-700 TTL Selection Using Spot Metering?" Previous topic | Next topic
Arkayem Moderator Awarded for his high level skills in flash photography Charter MemberSat 24-Nov-12 03:05 PM
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#11. "RE: SB-700 TTL Selection Using Spot Metering?"
In response to In response to 10
Sat 24-Nov-12 03:07 PM by Arkayem

Richmond Hill, GA (Savannah), US
          

>>>When your camera is set to spot meter and the SB-700
>is
>>in
>>>TTL, the camera will meter on the focus point and
>send
>>that
>>>info to the flash.
>>
>>Actually, in regular TTL mode, no camera metering
>information
>>is sent to the flash. In regular TTL mode, the flash
>power
>>setting is calculated strictly from the monitor preflash.
>The
>>metering value or mode on the camera will make no
>difference
>>to the flash power.
>
>Hi
>Damn it, I thought I understood this but now I dont. I know
>that I have to select Spot Metering mode to force the gun off
>TTL-BL and into TTL mode. But what metering mode is is being
>used to work out info from the pre-flash?

When using flash in Regular TTL mode, the reflected energy from the preflash is always measured center-weighted across the entire frame, regardless of the metering mode of the camera. In Regular TTL mode, the metering mode in the camera is only used for determining the aperture/shutter combination and has no impact on the flash metering.

There is no communication between the flash metering and the camera metering when using Regular TTL mode. The flash sets the entire exposure based on the preflash, and ambient light has no impact on this measurement. This is why it is best to use the camera in Manual mode when using regular TTL and set the ambient exposure to be about 3 stops underexposed based on the camera meter. Then, the flash will effectively make the entire exposure on the subject (the background will be mostly ambient).

This works entirely differently when using TTL-BL, and the approach you use should also be entirely different.

Russ
Retired Professional Photographer
Nikonian Moderator
Russell MacDonald Photography
Nikon CLS Practical Guide

  

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This is a hot, active topic!SB-700 TTL Selection Using Spot Metering? [View all] , richlewt , Thu 22-Nov-12 05:27 PM
 
Subject Author Message Date ID
Reply message RE: SB-700 TTL Selection Using Spot Metering?
Luke_Miller Silver Member
22nd Nov 2012
1
Reply message RE: SB-700 TTL Selection Using Spot Metering?
mklass Platinum Member As a semi-professional involved in all manner of photographic genres including portraiture, sports, commercial, and events coverage, Mick is always ready to help Nikonians by sharing his deep knowledge of photography and printing. Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014
22nd Nov 2012
2
Reply message RE: SB-700 TTL Selection Using Spot Metering?
Luke_Miller Silver Member
22nd Nov 2012
3
Reply message RE: SB-700 TTL Selection Using Spot Metering?
mklass Platinum Member As a semi-professional involved in all manner of photographic genres including portraiture, sports, commercial, and events coverage, Mick is always ready to help Nikonians by sharing his deep knowledge of photography and printing. Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014
22nd Nov 2012
4
Reply message RE: SB-700 TTL Selection Using Spot Metering?
Luke_Miller Silver Member
22nd Nov 2012
6
Reply message RE: SB-700 TTL Selection Using Spot Metering?
Arkayem Moderator Awarded for his high level skills in flash photography
23rd Nov 2012
8
Reply message RE: SB-700 TTL Selection Using Spot Metering?
richlewt
22nd Nov 2012
5
Reply message RE: SB-700 TTL Selection Using Spot Metering?
briantilley Moderator Deep knowledge of bodies and lens; high level photography skills
22nd Nov 2012
7
Reply message RE: SB-700 TTL Selection Using Spot Metering?
Arkayem Moderator Awarded for his high level skills in flash photography
23rd Nov 2012
9
     Reply message RE: SB-700 TTL Selection Using Spot Metering?
richlewt
24th Nov 2012
10
          Reply message RE: SB-700 TTL Selection Using Spot Metering?
Arkayem Moderator Awarded for his high level skills in flash photography
24th Nov 2012
11
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Patrick604
02nd Dec 2012
12
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Arkayem Moderator Awarded for his high level skills in flash photography
03rd Dec 2012
13
                         Reply message RE: SB-700 TTL Selection Using Spot Metering?
Shene Silver Member
03rd Jan 2014
14
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luckyphoto Gold Member
03rd Jan 2014
15
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Arkayem Moderator Awarded for his high level skills in flash photography
04th Jan 2014
16
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Trefayne Silver Member
06th Feb 2014
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Arkayem Moderator Awarded for his high level skills in flash photography
07th Feb 2014
18
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Trefayne Silver Member
07th Feb 2014
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Arkayem Moderator Awarded for his high level skills in flash photography
07th Feb 2014
20
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Trefayne Silver Member
07th Feb 2014
21
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Arkayem Moderator Awarded for his high level skills in flash photography
07th Feb 2014
22
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Trefayne Silver Member
07th Feb 2014
23
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cosmicfires Silver Member
22nd Jun 2014
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