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A MEMBER OF THE ZATZ MAGAZINE NETWORK |
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May 21, 2004 |
INSIDE THIS ISSUE
Better flash with guide numbers
Those wacky reader letters
This week's news |
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Buy this guide and you might be able to afford that dream honeymoon. |
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PHOTOGRAPHY BASICS
A guide to guide numbers (and how knowing about guide numbers will make your flash photography more successful)
By James Booth
What the heck is a guide number and why is it important? I often wondered this myself. Had I taken the trouble to learn, a lot of my earlier attempts at flash photography would have been more successful. In essence, a guide number, or flash factor, is a measurement of light output for a given flash at a given film speed. In this article, I will attempt to be your guide to the guide number system.
"A guide number is a measurement of light output for a given flash at a given film speed"
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Follow me please
For each flash unit, the manufacturer determines the guide number by taking into account the light output, multiplication factor of the reflector, and ambient environmental reflective qualities. Generally, the published guide number for a flash is usually for use with 100 speed film. Because of the varying light sensitivities of the different film speeds, the guide number will change as the film speed changes. This is why it's important to hang on to those instruction manuals. Each of my flash manuals has a guide number chart for that flash's guide number by film speed. Figure A shows the guide number chart for my SunPak AP-52 flash.
FIGURE A
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Notice the guide number (GN) changes by film speed. Click picture for a larger image.
This way please
So why is it important to know about guide numbers? Do you use a flash meter? If so, then you probably don't have much need for guide numbers. But if you want to take flash photos and don't have a flash meter, guide numbers can save you a lot of trial and error and go a long way toward making your photos come out better. Knowing about guide numbers can also help you in choosing a new flash or strobe by making sure you don't get one that's too weak for your needs. The higher the guide number, or GN, the more intense the light output.
For the rest of the guide number story, tap your mouse here and read on.
LETTERS TO THE EDITOR
Staying on the right side of the law, and the inevitable grammar nit
By David Gewirtz
This week, we've got a thank you for James Booth's wonderful Photography Basics series, as well as this month's inevitable letter from a reader pointing out our lack of basic grammar skills. Here they are:
Staying on the right side of the law
James, your article helped a lot; it made the subject understandable. I
am looking forward to your future writings. Thank you.
Joe Mirsky
Assistant U.S. Attorney
Appellate Division
U.S Department of Justice
Why we should have never played hooky in high school
At the end of this e-mailed issue, you have: "James Booth is a self-taught PC and Palm device user that dabbles in graphics and photography. He can be reached at address@hidden";
Is Mr. Booth a person or a thing? If a person, it might be better to write "...user who dabbles in...", don't you think?
Rodney Leinberger
My measured response
Mr. Booth is most definitely a person (as I'm sure you well know). One would hope you derived more value from his article than whether or not his bio is gramatically perfect. This is, after all, Connected Photographer Magazine, not Connected Picky About Grammar Magazine.
That said, thanks for pointing it out.
Please keep those cards and letters coming. You can send them in to address@hidden.
Keep reading, bucko. There be news down there...
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CONNECTED PHOTOGRAPHER NEWS CENTER
This week's news
Want to get the very latest photography news? The Connected Photographer News Center is updated every day with news of product releases, industry info, tips, techniques, and pointers to great photography resources on the Web. Here's this week's news:
SOFTAVA PicturePassword
SOFTAVA has introduced PicturePassword, a new solution wherein you just tap a point only you know and your handheld unlocks without entering a password. Security is preserved in that after one wrong attempt the only way to access your data is to enter a long and complicated text password.
Sagem dye sub printer
Using dye-sublimination technology, the Photo Easy Printer 150 creates 10 cm by 15 cm (approx. 4" x 6") borderless prints with high definition and continuous color tone rendering comparable to positive film. The prints are produced in about 120 seconds at a pixel quality of 300 x 300 per inch (equivalent to inkjet 4800 x 4800 dpi), onto high strength plastic paper which is also tear-proof, waterproof, finger-proof and UV resistant.
Symantec to buy BrightMail
Security vendor Symantec has announced plans to acquire competitor BrightMail, which makes tools for blocking spam and viruses.
MobileWrite v3.2
Inkmark Software has released MobileWrite v. 3.2, a handwriting recognition program that makes it easy to enter text and data into your favorite Palm OS applications. MobileWrite recognizes your own handwriting immediately, converting your stylus strokes into letters, numbers, and punctuation and it works with your calendar, address book, memo sheet, and all Palm OS applications.
LCD shortage
Sony and Nintendo face a shortage of key parts for their anticipated portable gaming systems, which could crimp profits and sales of the rival products when they hit stores later this year. Demand for mobile phones and digital cameras has created a shortage of small liquid-crystal displays (LCDs), spelling trouble for the Sony's PSP and Nintendo's Gameboy DS.
FBI spammer crackdown
The FBI told Congress on Thursday that it has "identified over 100 significant spammers" so far and is targeting 50 of the most noxious for potential prosecution later this year.
Nikon D70 wins Camera Grand Prix 2004
Nikon is pleased to announce that the D70 has been selected to receive the Camera Grand Prix 2004 award. The Camera Grand Prix, sponsored by the Camera Press Club, an organization founded in September 1963 and comprised of writers from thirteen of Japan's leading photography and camera publications, is the most prestigious award presented to a camera in the Japanese photo industry.
Sagem dye sub printer
Using dye-sublimination technology, the Photo Easy Printer 150 creates 10 cm by 15 cm (approx. 4" x 6") borderless prints with high definition and continuous color tone rendering comparable to positive film. The prints are produced in about 120 seconds at a pixel quality of 300 x 300 per inch (equivalent to inkjet 4800 x 4800 dpi), onto high strength plastic paper which is also tear-proof, waterproof, finger-proof and UV resistant.
Four new Velbon tripods
Velbon has released four new tripods, the Ultra Maxi F, Ultra Maxi SF, Ultra Luxi F, Luxi SF. All feature Velbon's "Twist Lock" leg system and other features such as pan and tilt heads, ball and socket heads, and compact size when collapsed.
ColorPlus monitor calibration
Colour Confidence, the color management division of TypeMaker, announced the launch of their monitor calibration utility, ColorVision ColorPlus. The device includes wizard-based monitor calibration software and a color hardware sensor that connects to a computer using a USB port and easily attaches to a CRT, LCD or notebook monitor.
Ofoto offers KODAK PERFECT TOUCH
Ofoto announced the addition of KODAK PERFECT TOUCH processing to its online photo processing services. With the addition of KODAK PERFECT TOUCH processing, pictures ordered through Ofoto will reveal more vibrant colors, richer detail and fewer dark shadows.
Kodak flexible display
Eastman Kodak is introducing a technology that enables the creation of thin, flexible, lightweight displays. Made of coated plastic, Kodak's flexible film technology is shatter-proof and offers a wide viewing angle.
New Tamron Di lenses
Tamron announced two new models in their Di (Digitally integrated) lens line, the SP AF 90mm f2.8 Macro 1:1 Di and the SP AF 200-500mm f5.6-6.3 Di.
FotoTime FotoAlbum Pro 4.1
FotoTime, an online photo service specializing in sharing and organizing digital images, announced the availability of FotoAlbum Pro 4.1. FotoAlbum Pro 4.1 has many new features including archiving, importing and exporting, Video FotoShows, and EXIF updating.
Extensis Portfolio 7.0 for Windows
Extensis announced immediate availability of its Digital Asset Management (DAM) solution, Portfolio 7 and Portfolio Server 7 for Windows, with Macintosh versions available later this month. Portfolio enables photographers, graphic artists and other individuals and workgroups to organize, retrieve, repurpose, and distribute digital files quickly.
Digital Photo Professional, EOS Viewer Utility
According to Rob Galbraith's Digital Photography Insights, Canon USA's Chuck Westfall indicates that the worldwide release date for Digital Photo Professional, Canon's new browsing and RAW file processing software, has been set for May 20, 2004.
Cyber-shot DSC-F88
The DSC-F88's compact, all-metal body is fitted with an internal Carl Zeiss Vario Tessar 3X optical zoom lens that allows it to rotate 300 degrees. The camera has a 5.1 megapixel CCD image sensor and employs a rechargeable InfoLithium battery system for quick recharging time.
Kodak and Lexar
Lexar Media will manufacture and distribute a full range of KODAK branded memory cards and will work with Kodak to provide consumers with a wide variety of reliable, high quality, mass-market memory cards worldwide.
LITEON IT double layer DVD burner
LITEON IT announce the implementation of double-layer burning for their ATAPI/E-IDE 8X DVD drives with the launch of their versatile, easy to use SOHW-832S Dual Drive DVD/CD, Player/Recorder.
StudioLine Photo 2
H&M Systems Software has introduced the latest version of StudioLine Photo 2 digital imaging software. This latest release offers added photo editing power, a smarter camera interface, professional RAW format support, new designer web galleries, and faster photo database response time.
Kodak firmware updates
Kodak has announced the release of Version 5 firmware developed to resolve colored hue shifts identified by some users of the DCS Pro SLR cameras.
Retro Photographic paper
Retro Photographic has added their own Retro Original brand of Printing-Out Paper to their product portfolio. Printing-Out Paper, or POP, has an excess of silver nitrate in the emulsion, so the image is formed by the action of light alone with no developer being needed.
NetZero HiSpeed Stakes
NetZero announced that it is giving away five 2004 Chevrolet SSR roadsters to users who sign up for NetZero HiSpeed.
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Copyright © 2003, ZATZ:Pure Internet Publishing, a unit of Component Enterprises, Inc. All rights reserved.
Connected Photographer Magazine is an independent publication of ZATZ:Pure Internet Publishing, a unit of Component Enterprises, Inc. All rights reserved. Connected Photographer, Computing Unplugged, the ZATZ name, and the ZATZ logo are trademarks or service marks of ZATZ:Pure Internet Publishing, a unit of Component Enterprises. All other brands and product names are trademarks and registered trademarks of their respective holders.
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