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Auto and manual focus modes in digital cameras

One of the important phases of shooting a good photo is focusing on the photo's objects. Photos that are out of focus look bad and blurry. Sometimes shooting out of focus objects is done on purpose as an artistic effect but in most cases a sharp focused object is the photographer goal.

Most low-end pocket digital cameras do all the focus work for you. These are literally "point and shoot" cameras. Furthermore even if you wanted to manually focus using such cameras it would have been practically impossible since they do not include a real optical viewfinder. Using the LCD to check for focus is useless as the LCD is not good enough to truly let you know if an object is perfectly focused or not.

Digital SLR cameras on the other hand have an optical viewfinder that allows you to truly see the photo through the camera's lens. With digital SLR cameras you can see how well the objects in the photo are focused and correct the focus as needed.

Digital cameras support at least three focus modes:

Manual focus: In this mode the camera does not automatically focus on the objects in the photo. You will have to manually set the focus as desired. This is accomplished by either pushing some buttons that in turn change the focus or more commonly by rotating a focus ring on the lens clockwise or counterclockwise as needed. You can see the results of changing the focus by looking through the viewfinder. When you are happy with the focus you can press the shutter button to take the photo.

Single auto focus: In this mode the camera automatically focuses on the objects in the photo. The camera automatically focuses when you press the shutter button either all the way down to shoot a photo or half way down to lock the focus. In this mode the automatic focus process is carried out only once as soon as the shutter button is pressed. Once the focus is achieved it is locked and it is not changed until the next time the shutter button is pressed. If you keep the shutter button pressed half way down and then the camera moves or the object moves the focus might be lost. This mode is useful when shooting static objects. In most cases you will press the shutter button and hold it half way down. The camera will run the auto focus process. It will let you know when focus is achieved by displaying a green icon and by playing a short beep.

Continuous auto focus: In this mode the camera continuously focuses on the objects in the photo. Once the shutter button is pressed and as long as it is held half way down the camera continuously focuses on the objects in the photo. In this mode the camera continuously corrects the focus as the objects distance from the camera changes. This mode is useful when you shoot photos of moving objects such as a race car during a race or airplanes during an air show. You can hold the shutter button half way down and continuously move the camera to follow the object. The camera will continuously keep the object in focus. When you are ready to shoot the photo simply press the shutter button all the way down. One drawback of this mode is high power consumption as the camera continuously corrects the focus it uses the power hungry motors in the lens in order to move the optical components.

Like any other feature automatic and manual focus modes have their pros and cons. The first step to using them to your advantage is to understand how they work and what they were designed for. The next step is to experiment shoot photos using different focus modes and different types of objects and see how the camera behaves. Once you have done that you will be ready to instinctively use the best focus mode for each photo situation.

About the Author

This article can be published as long as the resource box including the backlink is included. Ziv Haparnas writes about practical technology issues. Find more on photo printing and photography is on printrates.com - a place about digital photo printing

sony digital cameras Items For Viewing
Jackass - The Movie (Unrated Special Collector's Edition)

Jackass - The Movie (Unrated Special Collector's Edition)
Some critics see the success of Jackass: The Movie as the last nail in the coffin of civilization, and they're probably right. This compilation of pain-inflicting stunts and embarrassing pranks has no artistic merit whatsoever--which doesn't keep it from being freakishly entertaining. Among other things, Johnny Knoxville and his posse get beaten up by a female kick-boxing champion; shoot bottle rockets out of their rectums; run amok in Japan wearing giant panda bear costumes; swim with whale sharks while holding pounds of brine shrimp in their swimsuits; and get done up in realistic old-age makeup so that they can race each other in motorized wheelchairs, among other goofs. It's a weird mixture of machismo and masochism, adolescent recklessness and frat boy homoeroticism, and someday someone will write a doctoral thesis about how Jackass relates to our safety-obsessed society. In the meantime, just enjoy. --Bret Fetzer

Customer Review: Not my piece of cake, but maybe it's yours

Sigh, it's finally happened: the generation gap thing. I NEVER trash something that's primarily aimed at younger people and doesn't resonate all that much with me; I can usually find something to like about it. But "Jackass: The Unrated Edition"? Okay, I'll start with something positive. SOME of this movie is amusing and entertaining: the rental car that's returned after Johhny Knoxville enters it into a stock car race and trashes it thoroughly; the "old man" (one of the "Jackass" guys in make-up) who is caught shoplifting in a convenience store and keeps on shoplifting even after he's caught and repeatedly yelled at, and one or two other things. But too much of this movie is just gross and/or stupid. Maybe that's the point, I don't know. But wincing at numerous scenes of self-mutilation and self-induced vomiting wasn't fun or entertaining but, well... wince-inducing. But too each his or her own. This unrated edition contains a longer cut of the original theatrical release of the movie, as well as more extra scenes among the special features. Knock yourself out if this is for you-- it's certainly a generous DVD. But I think I'll go watch something else now.

Customer Review: There Will Be a Jackass 3

It's true AND it rhymes. Top that. Of course there will be another. Why kill a cash cow that takes almost no money to produce? It's money in the bank. Mooooooooooo. Cha-Ching!



I freely admit I, a college graduate who loves to read and watch foreign movies, thoroughly enjoyed Jackass. Sure, I was dead drunk when I watched it but, still, I died laughing. This movie is Idiocracy, here and now. Watch the Mike Judge movie, Idiocracy, to see what I mean. What is the difference between the television show "Ow, My Balls" featured in Idiocracy and Jackass? None. Also notice the raptness with which "Ow, My Balls" is watched by the movie's character and consider the popularity of the Jackass series. Hmmm.



A bunch of crazy-as-foxes goofs humiliate and torture themselves for your viewing pleasure. A lot of reviews opine that these guys are a bunch of morons. Nonsense. They are wildly creative, impossible to embarrass and daring. We pay good money to sit on our couches in the comfort of our homes and point and laugh. Who are the real morons? Like, duh. Johnny Knoxville is a multi-millionaire actor/writer/producer. What have you or I accomplished recently?



Johnny Knoxville and co. are taking advantage of the fact that suffering sells as long as it's cloaked as wacky stunts & comedy. People like to watch other people be hurt and humiliated. They just do. Who knows why. Maybe because pain and humiliation are inevitable in life and misery loves company. Whatever. All Knoxville and his buddies have done is take an Adam Sandler or Jim Carrey comedy and taken out all the plot and characters and sets and any anything else that might be the slightest bit distracting and served up an entire highlight reel of jokes and stunts. In doing so, they and their audience make an invaluable contribution to the dumbing-down of America. Congratulations all around.

Introduction to the Nikon D80 Digital SLR

Introduction to the Nikon D80 Digital SLR
If you have just purchased your Nikon D80, the controls on the outside of the camera coupled with all the menus and custom settings can be downright overwhelming. We give you a structure for looking at the controls as well as a repeatable ritual for taking great photos with your new camera. You spent a bundle on this camera. Let it be an extension of your hands rather than a struggle. The Nikon D80 is a powerful piece of equipment. A solid understanding of its features and controls can really unleash its potential. Once you learn how the camera's components work together, you'll have all the tools you need to capture the best image under all conditions. Topics include: Be Prepared (To Get the Shot) Shutter Priority Aperture Priority/Depth of Field Focus Alternatives Metering and Bracketing White Balance/Color Temperature ISO Playback Options / Image Review Understanding Histograms Exposure Compensation Flash Overview Custom Settings Tripods and Telephoto Lenses Programmable Buttons RAW (NEF) Files Composition My Menus And much more! Take great pictures with your Nikon D80! All you need is this training DVD and about 93 minutes, and you'll have the knowledge and the confidence to create the images you want. The topics are arranged in chapters, so you can move at your own pace, and return later to individual s

Customer Review: Practical and easy to understand

I bougth a series of books and manuals but this is the easiest way to understand the cameras's capabilities.





Customer Review: Good for the novice

I liked this book and still refer to it from time to time. Has good points and explains things especially to a Nikon noive such as myself.

Introduction to the Nikon D40 / D40x

Introduction to the Nikon D40 / D40x
Take great pictures with your Nikon D40! All you need is this training DVD and about 2 hours, and you will have the knowledge and the confidence to create the images you want. The topics are arranged in chapters, so you can move at your own pace, and return later to individual subjects.

Customer Review: Great entry level SLR camera

I purchased Introduction to the Nikon D40/D40X DVD to help a young lady get started with her camera. Several hundred photos later, interest is only growing, thanks to information learned with the DVD. I would recommend this DVD to anyone who wants to learn about the capabilities of the Nikon D40/D40X.

Customer Review: Useful addition to owner's manual

This DVD is a step-by-step guide to fully exploit the vast potential of this great new Nikon camera. Covers most topics a beginner as well as an intermediate user would like to see. Be sure to have your camera handy when you watch it!

Duracell Pre Charged Rechargeable NiMH AA Batteries, 4-Pack

Duracell Pre Charged Rechargeable NiMH AA Batteries, 4-Pack
Customer Review: This is how batteries should be made!

Pros:

-For a rechargeable battery, these batteries does not need to be charged before you use it for the first time; right from the packaging into your gadgets.

-They last a long time.

-Does not need special charger. You can use your existing NiMh charger.



Cons:

-Just like what NLee mentioned (above). You can confuse them with regular Duracells and mistakenly thrown away after losing charge.

-This later technology is still expensive. I got them on sale from Safeway for 11$ Normally sold at 14.99$. Target also sells them for $11.



I also like Eneloops by Sanyo. But they are not easily available at your local stores.

Customer Review: An eneloop by any other name...

Judging from similarity of technical specifications and physical shapes of (+) and (-) terminals, I am convinced that the Duracell Pre Charged AA is actually SANYO eneloop AA underneath a different wrapper. Therefore all the good things you heard about eneloop apply to Duracell 'Pre Charged', too.



My own testing has shown that the capacity of eneloop AA cell is slightly above the claimed 2000mAh, and it is able to retain at least 85% of its charge after 5 months in storage. The Rayovac Hybrid AA starts with slightly higher capacity at 2100mAh, but it 'only' retains 80% capacity after 5 months. For all practical applications, both are equally good. Just pick whichever brand (Sanyo, Rayovac, or Duracell) is on-sale, and you can't go wrong.



One small problem with the Duracell 'Pre Charged' cell is that: it looked too similar to the well-known 'Copper Top' alkaline cell. So there is a good chance that people may mistaken it for a disposable cell. Personally, I prefer the distinctive-looking white case of the eneloop cell.

sony digital cameras in the news
RED camera reveals videogame faces

Mon, 24 Nov 2008 08:09:35 -0800
Gizmodo Australia reports on a New York Times photo essay created with stills from the RED camera. More and more this is becoming the practice as photographers are expected to shoot video simultaneously. With Scarlet and the DSLR’s that shoot video such as the EOS 5D Mark II around the corner it’s clear that the fields of still and motion photography are merging: British photographer Robbie Cooper used stills from the video taken by his RED camera to show that look of total concentration ac

BigtimeWireless.com Retailer of Unlocked Cell Phones and Digital Cameras

Tue, 25 Nov 2008 09:30:46 GMT
Leading online retailer of unlocked mobile phones, smartphones, digital cameras, and camcorders is a winner in the StartupNation.com business competition.

Using RED with Avid- you need Metacheater

Tue, 25 Nov 2008 16:57:18 -0800
Here’s a nice little helper app that creates ALE (Avid Log Exchange) metadata out of RED .R3D files. The Red16 EDL template works with Avid’s EDL Manager application and was provided by Avid to assist with tapeless workflows, in particular Red Digital Cinema workflows. This template allows tape names of up to 16 characters in length. This works hand in hand with MetaCheater’s Red Options to track the entire file name of a R3D file as a tape name. Get it here: http://web.me.com/jabezolssen

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