Bracketing and How To Use Tt Correctly...

Home
>
Photography
>
Bracketing and How To Use Tt Correctly...

Bracketing and How To Use Tt Correctly...

What Is... Exposure Bracketing

Exposure bracketing is a simple technique professional photographers use to ensure they properly expose their pictures, especially in challenging lighting situations.

When you expose for a scene, your camera's light meter will select an aperture / shutter speed combination that it believes will give a properly exposed picture.

Exposure bracketing means that you take two more pictures: one slightly under-exposed (usually by dialing in a negative exposure compensation, say -1/3EV), and the second one slightly over-exposed (usually by dialing in a positive exposure compensation, say +1/3EV), again according to your camera's light meter.

The reason you do this is because the camera might have been 'deceived' by the light (too much or too little) available and your main subject may be over- or under-exposed. By taking these three shots, you are making sure that if this were ever the case, then you would have properly compensated for it.

As an example, say you are taking a scene where there is an abundance of light around your main subject (for example, at the beach on a sunny day, or surrounded by snow). In this case, using Weighted-Average metering, your camera might be 'deceived' by the abundance of light and expose for it by closing down the aperture and/or using a faster shuter speed (assuming ISO is constant), with the result that the main subject might be under-exposed. By taking an extra shot at a slight over-exposure, you would in fact be over-exposing the surroundings, but properly exposing the main subject.

Another example would be the case where the surrounding might be too dark, and the camera exposes for the lack of light by either opening up the aperture and/or using a slower shutter speed (assuming ISO is constant), then the main subject might be over-exposed. By taking an extra shot at a slight under-exposure, you would in fact be under-exposing the surroundings, but properly exposing the main subject.

Now, most digital cameras have auto exposure bracketing, meaning that if you select that option before taking your shot, the camera will automatically take three shots for you: one which it thinks it has perfectly exposed; a second one sightly under-exposed; and the third one slightly over-exposed.

When should you use exposure bracketing? Anytime you feel the scene is a challenging one (too much highlights or shadows) as far as lighting is concerned, e.g. sunsets are usually better taken slightly under-exposed so use exposure bracketing there, or whenever you want to be sure you don't improperly expose a fabulous shot.

Remember, you are not using film anymore, so there are really no wasted shots (unless you are severely constrained by the size of your storage media).

Digital Dodging & Burning

Should you delete the extra shots right away? No, if storage permits, keep all three shots until you get home and upload them to your PC and into an image editing software, such as Photoshop. By using the layers functionality of Photoshop (or similar functionality of another image editing software), you can load all three shots into different layers and then carefully erase the under-exposed or over-exposed part of one or more layers to end up with a final shot where both the main subject and the surroundings are properly exposed!

This Photoshop functionality allows you to shoot in very extreme lighting situations where there are many parts in different intensity of light and shadows such that you are losing details in the highlights and shadows. In this case, you might need more than two extra shots to obtain details in the different parts. Without moving the camera (a tripod is essential here), take as many shots as you need, exposing for the different parts you want details to be visible. Then you would load them all up into Photoshop, each into its own layer, and by erasing the under- and over-exposed parts in each layer (granted, this equivalent of film 'dodging' and 'burning' can be a very tedious and challenging task in itself, but done properly it can be well worth the effort), you can end up with an 'impossible' shot where every part of the cave is properly exposed.

Used judiciously, exposure bracketing is a simple technique that can ensure proper exposure of a difficult lighting situation. Make sure you get a camera with good manual Bracketing control

Canon PowerShot S70 - Bracketing control

In The News:

Yahoo! News: Top Stories

Obama announces Clinton, Gates for Cabinet (AP)

AP - President-elect Barack Obama picked a national security team headed by former campaign rival Hillary Rodham Clinton and Bush administration holdover Robert Gates on Monday, and said he wants to consult with military commanders before settling on a firm timetable to withdraw U.S. combat troops from Iraq.

Panel says US has been in recession since Dec. '07 (AP)

AP - The U.S. economy has been in a recession since December 2007, the National Bureau of Economic Research said Monday.

Obama still looks for Iraq pullout in 16 months (AP)

AP - Barack Obama says the U.S.-Iraq security agreement approved by Iraq's parliament puts the U.S. on a "glide path" toward reducing forces there.

Bernanke: further interest-rate cuts 'feasible' (AP)

AP - Federal Reserve Chairman Ben Bernanke said Monday that further interest-rate cuts are "certainly feasible," but he warned there are limits to how much such action would revive an economy likely to stay weak well into next year.

Police respond to shooting at Miami mall; 2 hurt (AP)

AP - Authorities responding to a shooting at suburban Miami mall say one person has been shot and taken to a hospital.

Retailers offer deals, discounts on 'Cyber Monday' (AP)

AP - Retailers who saw Thanksgiving holiday sales drop off as the weekend progressed stepped up online promotions on the day known as "Cyber Monday" to try to get consumers tired of the crowds at stores to keep shopping.

India demands 'strong action' from Pakistan (AP)

AP - India demanded Pakistan take "strong action" against those behind the 60-hour siege that left at least 172 people dead, as new details emerged Monday about the gunmen and the survival training that enabled them to thwart Indian commandos.

Sending spam in Israel could mean a big fine (AP)

AP - Israel has gotten fed up with spam. Anyone who sends out messages without receiving the recipient's consent can now be slapped with a big fine.

Tina Fey's husband talks about her facial scar (AP)

AP - Tina Fey's husband is talking about something the "30 Rock" actress would rather not discuss: the scar on her left cheek.

Police investigating hospital in Burress shooting (AP)

AP - Plaxico Burress was led out of a police precinct in handcuffs Monday after surrendering on a weapons possession charge, and authorities said that teammate Antonio Pierce is being investigated over his role in an accidental shooting at a Manhattan nightclub.

Obama names Clinton, Gates to lead foreign policy (Reuters)

Reuters - U.S. President-elect Barack Obama named former rival Hillary Clinton as secretary of state on Monday and said Robert Gates would remain defense secretary in a national security team charged with recasting America's leadership role in the world.

Wall Street stays near lows on Bernanke comments (Reuters)

Reuters - Stocks stayed near session lows on Monday after Federal Reserve Chairman Ben Bernanke said that the U.S. economy remained under considerable stress.

India demands swift Pakistan action over Mumbai (Reuters)

Reuters - India on Monday demanded Pakistan take swift action over deadly attacks in Mumbai it said were carried out by militants from its rival neighbor.

U.S. in recession as Europe debates spending hikes (Reuters)

Reuters - The U.S. economy has slumped into a recession, the nation's business cycle arbiter declared on Monday, while European leaders clashed over how much public money to spend tackling a deepening downturn.

House to seek about $500 billion economic stimulus (Reuters)

Reuters - Democrats in the House of Representatives likely will seek passage next month of an economic stimulus bill costing about $500 billion, a House Democratic aide said on Monday.

Bush calls flawed Iraq intelligence biggest regret (Reuters)

Reuters - President George W. Bush said the biggest regret of his presidency was flawed intelligence that Iraq had weapons of mass destruction and told ABC "World News" in an interview airing on Monday that he was unprepared for war when he took office.

Thai protesters consolidate hold on airport (Reuters)

Reuters - Thai protesters prepared to end their three-month occupation of the Prime Minister's office on Monday to consolidate their grip on the main airport ahead of a court verdict that could dissolve the elected government.

Alabama mayor arrested on corruption charges (Reuters)

Reuters - Federal authorities arrested the mayor of Birmingham, Alabama, on Monday in a corruption probe surrounding a massive sewer bond debt that has forced Jefferson County to the brink of bankruptcy.

Hawkish Obama names Clinton as top diplomat (AFP)

AFP - Barack Obama on Monday nominated Hillary Clinton to be his "tough," "smart" secretary of state and his former foe vowed to give her all to steer America through a perfect storm of global crises.

Mumbai attacks: India demands Pakistan take 'strong action' (AFP)

AFP - India on Monday formally accused "elements" in Pakistan of being behind the devastating Islamic militant attacks in Mumbai and demanded that Islamabad take "strong action".

Bracketing and How To Use Tt Correctly...

Photography Photography