By Kyle Schurman, About.com Guide
With some cameras, usually fixed-lens or DSLR models, you have the option of adding conversion lenses to give your camera's lens additional wide-angle or telephoto capabilities. The conversion lens attaches over the top of the existing lens. Use these tips to troubleshoot any problems you may be having with wide-angle conversion lenses.
Be certain the wide-angle conversion lens is made for your camera. Because the lens housing for each model of camera is different, conversion lenses must be made to fit particular models. If the conversion lens doesn't fit the original lens perfectly, you may have problems achieving the results you want.
With some types of conversion lenses, especially those labeled as "fish eye" lenses, you may need to change the settings on your camera to properly compensate for the extreme wide-angle look of a fish eye lens. If such settings are required for your camera, the user guide included with the conversion lens should mention it. You also may want to check the camera's user guide for tips on which menu settings you should use with a wide-angle conversion lens.
If you're having problems using the viewfinder to accurately frame your photos with the wide-angle conversion lens attached, try using the LCD to frame all of the photos. A wide-angle conversion lens may distort how the viewfinder works.
Don't try zooming in on a subject with the wide-angle conversion lens attached. The camera probably won't be able to correctly frame the photo or focus on the subject if both the zoom lens and conversion lens are in use. Some cameras disable the optical zoom with a wide-angle conversion lens attached; just be sure you don't activate the digital zoom feature, either.
The camera's flash also might not work properly with a wide-angle conversion lens attached. If you're having problems with achieving proper exposure from the flash with the conversion lens attached, try turning off the flash. Some cameras will disable the flash entirely when you're using a wide-angle conversion lens.
Because of the way the conversion lens attaches to the original lens, you may see a ghosting effect if shooting a scene with a bright light nearby. There is no way to avoid this effect, other than removing the wide-angle conversion lens
Finally, be sure to clean the original lens before attaching the wide-angle conversion lens. If the original lens is dirty, it won't matter how clean the conversion lens is.
MY THOUGHTS
Wide angle pictures would look like these:
photos from digital-photography-school.com
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