Auto Focus

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A Photographer S Guide To Focus And Autofocus

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Author : Alan Hess
language : en
Publisher: Peachpit Press
Release Date : 2016-02-17

A Photographer S Guide To Focus And Autofocus written by Alan Hess and has been published by Peachpit Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-02-17 with Photography categories.

Autofocus changed the way photos are taken, making it easier to capture and keep the subject in sharp focus. Since autofocus was first introduced, it has become much more complicated, offering different focus modes, focus types, and focus points. What started out as a way to simplify the photo-making process has turned into a complicated endeavor with numerous choices and settings. A Photographer’s Guide to Focus and Autofocus: From Snapshots to Great Shots is here to answer all your questions about the focusing system in today’s cameras and their various autofocus modes. Photographer Alan Hess covers the simple basics of focus: manual focus versus autofocus, the best focus modes to use, and how focus works in both DSLRs and mirrorless cameras. Then he discusses more advanced topics, including autofocus sensor types, back-button autofocus, and focus for DSLR video. There is much more to autofocus, and focus in general, than just pushing the shutter release button and hoping the image is sharp and in focus. With this book, you’ll learn how to get the right focus in your images, no matter what the occasion. Follow along with your friendly and knowledgeable guide, and you will: Learn the top ten things to know about focus, including how to use the focus controls on the camera, how to pick the autofocus point, and when to use pre-focus in your images Address common autofocus issues such as dealing with low contrast or low light, or shooting through obstacles like glass or a fence Develop troubleshooting techniques for what to do when the autofocus doesn’t work properly Work with both manual focus and autofocus and learn tricks to achieve better focus in video And once you’ve got the shot, show it off! Join the book’s Flickr group to share your photos and tips at flickr.com/groups/focusandautofocusfromsnapshotstogreatshots

Auto Focus

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Author : Susan Bright
language : en
Publisher:
Release Date : 2010

Auto Focus written by Susan Bright and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Photographers categories.

'Auto Focus' features the work of 75 contemporary photographers from around the world for whom self-portraiture is a central part of their work. Issues of identity, nationality, sexuality and race are raised by the portraits.

Passive Auto Focus For Digital Still Cameras And Camera Phones

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Author : Mark Noel Gamadia
language : en
Publisher:
Release Date : 2009

Passive Auto Focus For Digital Still Cameras And Camera Phones written by Mark Noel Gamadia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Cameras categories.

In order to gain valuable market share in the growing consumer digital still camera and camera phone market, camera manufacturers have to continually add and improve existing features to their latest product offerings. Auto-focus (AF) is one such feature, whose aim is to enable consumers to quickly take sharply focused pictures with little or no manual intervention in adjusting the camera's focus lens. While AF has been a standard feature in digital still and cell-phone cameras, consumers often complain about their cameras' slow AF performance, which may lead to missed photographic opportunities, rendering valuable moments and events with undesired out-of-focus pictures. This dissertation addresses this critical issue to advance the state-of-the-art in the digital band-pass filter, passive AF method. This method is widely used to realize AF in the camera industry, where a focus actuator is adjusted via a search algorithm to locate the in-focus position by maximizing a sharpness measure extracted from a particular frequency band of the incoming image of the scene. There are no known systematic methods for automatically deriving the parameters such as the digital pass-bands or the search step-size increments used in existing passive AF schemes. Conventional methods require time consuming experimentation and tuning in order to arrive at a set of parameters which balance AF performance in terms of speed and accuracy ultimately causing a delay in product time-to-market. This dissertation presents a new framework for determining an optimal set of passive AF parameters, named Filter- Switching AF, providing an automatic approach to achieve superior AF performance, both in good and low lighting conditions based on the following performance measures (metrics): speed (total number of iterations), accuracy (offset from truth), power consumption (total distance moved), and user experience (in-focus position overrun). Performance results using three different prototype cameras are presented to further illustrate the real-world AF performance gains achieved by the developed approach. The major contribution of this dissertation is that the developed auto focusing approach can be successfully used by camera manufacturers in the development of the AF feature in future generations of digital still cameras and camera phones.

50 Things Photographers Need To Know About Focus

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Author : John Greengo
language : en
Publisher: Rocky Nook, Inc.
Release Date : 2019-06-04

50 Things Photographers Need To Know About Focus written by John Greengo and has been published by Rocky Nook, Inc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-06-04 with Photography categories.

While focusing your camera seems like it should be a no-brainer—there’s autofocus, after all!—it’s often not a simple task. Depending on the shooting situation, your camera, and the countless scenarios that can “throw off” the focus, the task of achieving sharp images with great focus can be deceptively challenging. If you’re a passionate photographer eager to learn the best ways to achieve tack-sharp focus in your images, these 50 focus-based principles are exactly what you need to take your work to the next level. With photographer and author John Greengo as your guide, you’ll quickly learn nearly four dozen techniques for achieving focus in every shooting situation. You’ll learn: • How to optimize autofocus no matter what kind of camera you have (DSLR or mirrorless) • How to master manual focus • Which focus modes and focus areas work best for different situations • How to use your camera’s autofocus aids, such as magnification and focus peaking • Techniques to keep your camera stable, either handheld or on a tripod • How shutter speed and aperture affect sharpness Written in the author’s friendly and approachable style, and illustrated with examples that clearly show how each technique can help you capture great photos, 50 Things Photographers Need to Know About Focus is designed to be an effective, fast, and fun way to learn how to achieve great focus in your images—no matter what situation. TABLE OF CONTENTS Chapter 1: Focus Basics Chapter 2: Autofocus Chapter 3: Mirrorless Autofocus Chapter 4: DSLR Autofocus Chapter 5: Customized Autofocus Controls Chapter 6: Autofocus Aids Chapter 7: Autofocus and Lenses Chapter 8: Manual Focus and Lenses Chapter 9: Exposure Control for Focus Chapter 10: Advanced Focusing Techniques Chapter 11: Other Focus Topics

The Murder Of Bob Crane

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Author : Robert Graysmith
language : en
Publisher: Crown Pub
Release Date : 1993

The Murder Of Bob Crane written by Robert Graysmith and has been published by Crown Pub this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Social Science categories.

Investigates the bizarre 1978 murder of the popular television star, the shocking orgies of his last days, and the 1992 arrest of John Carpenter. By the author of Zodiac. 30,000 first printing. $30,000 ad/promo. Tour.

Real Time Face Priority Auto Focus And Adaptive Auto Exposure For Digital And Cell Phone Cameras

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Author : Mohammad Tayabur Rahman
language : en
Publisher:
Release Date : 2011

Real Time Face Priority Auto Focus And Adaptive Auto Exposure For Digital And Cell Phone Cameras written by Mohammad Tayabur Rahman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Algorithms categories.

Auto-focus (AF) and Auto Exposure (AE) are key features in consumer level digital and cell-phone cameras allowing users to focus automatically and set the exposure automatically. AF provides automatic focusing in order to get sharp images with no user intervention. AE is also a key factor for automatically obtaining images with the right amount of brightness exposure. While there are many algorithms in the literature addressing the issues of AF and AE, most of these algorithms do not take into consideration speed, accuracy and cost of deployment on actual digital and cell-phone camera platforms. The first part of this dissertation involves the development and implementation of a Face-Priority AF algorithm due to the fact that the great majority of pictures taken by consumers are of human faces. In Face-priority AF, the focusing decision is made based on a detected face area in the image, thus capturing a sharp picture of the face. Although a number of face detection algorithms have appeared in the literature, their use is limited when considering their real-time software deployment on resource limited digital or cell-phone camera processors. A fast software Face-priority AF algorithm is introduced in this dissertation by combining a skin color model with a computationally efficient shape processing scheme. This algorithm is compared with a conventional algorithm in terms of speed and accuracy. A real-time implementation of this Face-priority AF is achieved on an actual digital camera platform. The second part of this dissertation involves the development and implementation of a novel AE algorithm named Adaptive AE. It is shown that this algorithm provides a more effective auto-exposure solution, in particular in poor lighting conditions. Conventional AE methods utilize the image brightness in one way or another to set the right exposure level, whereas the developed AE method uses the maximization of an information theory measure. It is shown that the developed AE solution generates more effective exposure setting in terms of contrast and brightness deviation. A real-time implementation of the Adaptive AE algorithm is also achieved on an actual digital camera platform.

The Nikon Autofocus System 2nd Edition

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Author : Mike Hagen
language : en
Publisher: Rocky Nook, Inc.
Release Date : 2017-05-02

The Nikon Autofocus System 2nd Edition written by Mike Hagen and has been published by Rocky Nook, Inc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-02 with Photography categories.

With today’s advanced camera technology, achieving focus on a photographic subject seems like it should be a straightforward task, but many photographers know that it can be deceptively difficult, especially when shooting moving subjects or in challenging situations. Now, there is a complete guide available for Nikon shooters that will help them get tack-sharp photos every time.

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In The Nikon Autofocus System, 2nd Edition, photographer Mike Hagen, author of the bestselling The Nikon Creative Lighting System, takes his deep knowledge of Nikon technology and concentrates on its focus features. In this book, which covers all current Nikon DSLR models (including the D5 and D500), Hagen fully explains how Nikon autofocus works, including detailed discussions of all the autofocus modules, drive systems, and camera buttons and menus. He also devotes an entire chapter to explore how focus works with Nikon’s lenses.

Armed with this general knowledge, Hagen then dives deep and offers camera setups, settings, and best practices for specific field techniques that address the photographic genres that are notoriously challenging for focus: action and sports (indoor and outdoor), wildlife (including birds in flight), and macro photography. He also covers genres such as portrait, landscape, underwater, low-light, and street photography. Hagen not only advises on the best ways to set up the camera and focus systems, he gives helpful tips and tricks throughout the book.

The Nikon Autofocus System also covers:

• Live view autofocus methods and settings

• Achieving great focus in video

• AF tracking

• AF shooting styles, such as back-button AF and shutter-release AF

• HDR, panoramas, and other techniques for shooting with a tripod

• An entire chapter on additional terms and techniques, such as hyperfocal distance, calibrating lenses, focus and flash photography, and more

Auto Focus

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Author : Robert Graysmith
language : en
Publisher:
Release Date : 2002

Auto Focus written by Robert Graysmith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Actors categories.

Hipshot

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Author : Ken Heyman
language : en
Publisher:
Release Date : 1988

Hipshot written by Ken Heyman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Photography categories.

Street photography of the five boroughs of New York City, shot 1984-1985, from the hip with an auto-focus camera. Without looking through the viewfinder 'the appalling variety' of teeming urban life produced by the odd and unexpected angles comes almost too close for comfort. Fascinating perspective on the world and a lovely slice of NYC in the mid-'80s. With an Afterword by the photographer.

Using Automatic Auto Focus Cameras Kw 11

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Author :
language : en
Publisher:
Release Date : 1987

Using Automatic Auto Focus Cameras Kw 11 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.