Wednesday, October 13, 2010
Give Film Lenses New Digital Life
Lens adapters let you use an almost limitless combination of older lenses, as well as modern high-tech models, on today’s most popular DSLRs
The DSLR manufacturers all produce some excellent lenses for their cameras. But spend some time in professional photography forums online, and you’ll find pros extolling the virtues of older “elite” lenses many feel are optically superior to modern designs. To some of these individuals, the phrase “designed for modern DSLRs” translates to “costs and corners were cut in design and manufacturing.” Of course, many of today’s professional-level lenses are outstanding, but there are some special models from the film era that continue to hold a place high in the pantheon of photography.
|The Sony LA-EA1 permits use of Sony Alpha DSLR lenses on the NEX mirrorless cameras.|
Besides letting you use older lenses on newer camera bodies, adapters also expand the range of current lenses available for new cameras. For example, the Micro Four Thirds System is fairly new, and relatively few Micro Four Thirds lenses are available. But simple adapters make it possible to supplement those with the full range of standard Four Thirds System lenses (retaining full automation, including autofocusing capability with most of them). Sony’s new NEX-series mirrorless cameras (which, despite their tiny size, contain DSLR-sized APS-C image sensors) expand the initial NEX lens offering via an optional adapter that permits using Sony’s much wider line of Alpha DSLR lenses with them (albeit without autofocusing). Because the mirrorless cameras have relatively short flange back distances, just about any SLR lens for which an adapter is available can be used with them. You’re unlikely to use a Micro Four Thirds camera as a primary body, but they make great compact backups and are useful as dedicated “still- and motion-capture” devices. With an adapter, you can dramatically increase their usefulness.
Adapters With A Twist
Well, a tilt, actually. Adorama’s Flashpoint Tilt Adapter for Nikon Lens to Micro 4/3 not only allows you to mount Nikon lenses on Micro Four Thirds System cameras, it also allows you to tilt the lens 12° in any direction, thanks to 360° rotation capability. The new Lensbaby Micro 4/3rds Composer with Tilt Transformer does a similar trick with Lensbaby or Nikon optics, providing 12.9° of tilt in any direction. As view-camera users know, being able to tilt the lens allows you to control the plane of focus and put depth of field just where you want it.
Flange Back DistanceThe “flange back distance” is the distance between the lens mount and the image plane—the image sensor, in a DSLR. If the adapter is too thick, the flange back distance will be too long, and the lens won’t focus out to infinity. If the adapter is too thin, the flange back distance will be too short, and the lens will focus “beyond infinity.”
The first problem (inability to focus out to infinity) is the more serious, as it renders the lens/adapter/camera combination suitable only for close-up work. Careful manual focusing can solve the problem of combos that focus beyond infinity.
Adapters make it possible to use a wide range of treasured older lenses with this Olympus E-PL1 and other Micro Four Thirds System mirrorless cameras.
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