If your lens has screw
threads, you can probably screw additional lenses directly onto the end. Even so, you
may need something called a step-up ring. This is a device that screws onto the end of
your lens and provides a different diameter for screwing on the additional lenses. Lens
manufacturers typically only make lenses in a few sizes, such as 37mm and 43mm. If
your camera has a different thread size, you will need the step-up ring. You can get such
an animal at your local camera shop, from a filter company like Tiffen (www.tiffen.com),
or a web store like B&H (www.bhphotovideo.com). Your camera??™s manufacturer may
sell a step-up ring specifically for your camera as well. No matter where you buy it, a
step-up ring shouldn??™t cost more than about $10??“15.
?– Adapters Some cameras do not have a threaded lens but instead allow you to snap
additional lenses onto the end of the camera using an adapter. Usually, you??™ll snap or clip
the adapter onto the end of the camera lens and then screw the add-on lenses onto the end
of the adapter. Figure 8-2, for instance, shows a Kodak camera with its lens adapter in
place. The camera manufacturer typically makes adapters like these since they are such
specialized devices, designed to affix only to specific cameras.
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