The Technical Article Collection

By Dr. Bob Atkins

If you like what you've seen and read on my various pages scattered around the web (for example the free information pages on bobatkins.com), you might be interested in a collection of articles I have available for the cost of $10. Send email to me at bobatkins@hotmail.com if you have any questions or want to order the collection. The articles are now available only as a .pdf file, which can be viewed and printed (if desired) via the acrobat .pdf reader (free) - which you probably already have on your system. This collection is available to readers outside the USA provided they have some way to pay in $US. I prefer not to deal with credit cards or online payment methods, but on request I can accept payment via PayPal if that's the only way in which payment can be made.

This isn't a high pressure hyped up sales pitch. If you want to know more about some of the technical aspects of photography, I think you'll find some useful information in this collection of articles. Though the articles mostly deal with the technical side of photography, I've tried to write them so that you don't need a technical background to understand what I'm saying. However, if you want to know how to use your "point and shoot" camera, you'd be much better off going to your local bookstore and browsing their photography section, and if you're looking for ways to improve the creative side of your photography, you probably won't find them in the technical article collection. On the other hand, if you want a deeper understanding of the technical side of optics and photography, you'll probably find information in the technical collection that's hard to find elsewhere. 

I also have an package on LENS TESTING available if that's your focus of interest.


Contents of the Technical Article Collection 

(40+ pages total, Page counts approximate, 8.5x11" pages, 12pt font)

    ED and APO lenses (2 pages) 

    (Appeared in Nature Photographer magazine)
  • What do all the letters after lenes mean (ED, EDIF, L, APO etc)? 
  • Just what is an APO lens and what does it do? 
  • Are all "APO" lenses equal? 
  • Sharpness (4 pages) 

    (Appeared in Nature Photographer magazine)
  • What is sharpness? 
  • What issues affect sharpness (camera, lens, film)? 
  • What are lens aberrations and diffraction - how do they affect sharpness? 
  • How can sharpness be maximized? 
  • Depth of Field (4 pages) 

    (Appeared in Nature Photographer magazine)
  • What *exactly* is meant by depth-of-field? 
  • What's the hyperfocal distance and how is it used? 
  • How do you calculate hyperfocal distance? 
  • How can you calculate depth of field for Macro work? 
  • How can you calculate depth of field for "normal" distances? 
  • Tables for Macro DOF and Hyperfocal distances.


  • Background Blur (3 pages) 

    (Unpublished at present)
  • How does DOF relate to background blur? 
  • Does a longer lens or faster lens give more background blur? 
  • How do you calculate which lens will maximize background blur?
  • Plot of degree of blur vs. distance for several lenses


  • Exposure (6 pages) 

    (Unpublished at present)
  • What's an f-stop? 
  • What are EVs? 
  • How do you calculate fractional f-stops (1/2, 1/3, 1/4 stops). 
  • How do you determine exposure? 
  • How do incident and reflected light meters differ? 
  • How do you compensate for light and dark subjects? 
  • Teleconverters (5 pages) 

    (Appeared in Nature Photographer magazine)
  • What is a teleconverter? 
  • How much loss of sharpness do they cause? 
  • How do they affect exposure and depth of field? 
  • How do the Tamron and Canon teleconverters compare? 
  • Specific issues concerning EOS cameras and lenses 
  • Linear and Circular Polarizers (3 pages) 

    (Appeared in NAture Photographer Magazine)
  • What's the difference between linear and circular polarizers? 
  • How do they work? 
  • How can you tell which type your camera needs? 
  • how can you tell a linear from a circular polarizer? 
  • Using your Car as a Photoblind (2 pages) 

    (Appeared in Nature Photographer magazine)
  • How do I support the camera? 
  • Who makes camera mounts? 
  • What else should I know! 
  • Tamron 200-400 (2 pages) 

    (Appeared in Nature Photographer magazine)
  • A test of the Tamron 200-400/5.6 APO lens 
  • Comparison with Canon EF100-300 and EF300/4 lenses 
  • Test with 1.4x TC 
  • Projector lens test (2 pages) 

    (Unpublished at present)
  • Is a $250 Schneider lens better than a $35 Kodak lens? 
  • Just how much difference is there? 
  • Is the Schneider worth the extra? 
  • Address list (7 pages) 

    (Unpublished)
  • Addresses and phone numbers of around 100 photo equipment suppliers 
  • Photolog (1 page) 

    (unpublished)
  • A log sheet for recording important data for each shot (exposure, filters etc) 

You probably have some questions. Here's my best guess at what they might be, with appropriate answers: 

Why are you selling articles instead of putting all of them on the Web pages?

Well, the answer is simple. Even though the articles are copyrighted, I want to maintain as much control as possible over them since they either have been or may in the future be published in magazines . Putting stuff up on the Web is almost asking for it to be stolen and copyright issues concerning things put up on Web sites is still not well defined! Even if covered by copyright in the USA, international copyright is hard to enforce. There's a bunch of free stuff on my web pages at http://bobatkins.com which you are most welcome to read and print out (for your own use) if that's what you're looking for. The few dollars I make from article sales goes back into maintaining this website and paying for photographic materials used in research for writing more articles.


What's your background and are you qualified to write about this stuff? 

Well, that's a legitimate question. My backgound is in science. I have a Ph.D. from the University of Bristol (England) and I have worked in the field of optical spectrososcopy for a long time (too long, but that's another story...). I've written lots of peer review scientific articles, given a whole bunch of conference talks and I hold a number (15+) of patents involved with fiber optics and related topics. 

For 10 years I wrote a monthly column on microwave radio technology for QST (a "ham" radio magazine), explaining technical issues in simple terms - so I think I can write reasonably well on technical issues. I've been active in photography since my college days (I worked in a photofinishing lab during the collage vacations). I wrote much of the Canon EOS FAQ you can find on these Web Pages, the Nature Photography Guide which you have probably already read. I have also written 4 or 5 articles which have appeared in "Nature Photographer" and an article for  George Lepp's "Natural Image" newsletter. I created the current Usenet rec.photo hierarchy (though I'm not sure if that's a point in my favor or against me!). 

These articles are ones I've written with magazines in mind. Some of them have been published (but I hold the copyright, the magazines have only one-time reproduction rights), some have not. Some may be pending publication. Some may be slightly different from the magazine text or may have been updated. 


What if I don't find anything useful in these articles? 

Just send them back for a full $10 refund, no questions asked. All I ask in that case is that you don't copy them first! I should add that, so far, nobody has returned them, so I hope I'm doing something right! 

What can I do (and not do) with the articles? 

Anything you can or cannot do (legally) with a magazine. You can read them and make copies for your own use. You can't legally copy them and give them to other people, or reprint them in your magazine or newsletter, or post them on your web page without first negotiating an agreement with me. 

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