Whether you want to try glass from another manufacturer or want put your antiques to good use, lens adapters come to the rescue
Pros and Cons
Because adapted lenses cancel many of your camera’s auto features, they slow you down and therefore may not be suitable for certain applications, such as fast-action sports and wildlife photography. But landscapes, architecture, and other subjects that don’t rely heavily on autofocus are well-suited to adapted lenses.
Given the obvious difficulties involved with adapting alternative lenses, and the ready availability of high-quality lenses for current camera systems, you might rightfully ask: Why use alternative lenses with adapters? The chief reasons:
Cost: Alternative lenses can be cheaper than their unadapted counterparts, sometimes significantly so. Many are out of production but nonetheless readily available on the used market for a reasonable price.
Quality: Don’t believe all the hype that your camera maker’s lenses are the best out there. In fact, there are plenty of alternative lenses that may be superior to unadapted optics. In my case, I was less than satisfied with Canon’s wide-angle zooms, so I dispensed with brand loyalty and choose an adapted best-in-class solution instead.
Gap-filling: Even though the lens lineups for camera systems are fairly extensive, sometimes they have gaps. Alternative lenses often fill these gaps, especially for specialty uses.
System switch: If you have changed camera systems, but hate to lose your inventory of lenses from your old system, you might be able to use an adapter and keep using them. This is true when switching between manufacturers (such as from Nikon to Canon) or between systems within the same brand (such as Leica screw-mount to Leica M). You might not want to give up some of your favorite “legacy” lenses; adapters make it possible to keep using them.