I have used adaptor lenses with digital cameras for several years with mixed results. Like most contributors on this site, I have found that you clearly get what you pay for.
My current camera is a Nikon Coolpix 5700 and I needed more wide angle than the 34mm or so equivalent that the lens zooms to at the widest setting. I would have bought Nikon original, but since only 0.8x and fisheye are available, I decided on a Raynox DCR-6600PRO, it is a 0.66x adapter. I have used this lens both outdoors and indoors with external flash with decent results. At f2.8, the sharpness decreases noticably around the edges if viewed with 100% zoom on a computer screen. At f5.6, I cannot detect any degradation. I can detect minor vignetting in the top right corner only.
I also bought a cheaper 0.38x lens made by Bower. Though sold on eBay specifically for my camera, it does not work at all. The vignetting is so bad I have to zoom in quite a bit to get rid of the shadows in all 4 corners. Effective full frame usability puts it more at the 0.7x level with Nikon Coolpix 5700, even with a very short barrel adapter.
I previously used a Nikon Coolpix 880 with Nikon original 0.63x and 3x adapters. These lenses provided excellent quality. Again, you get what you pay for with adapter lenses. Do your research and make sure that the lens you buy will actually work with your camera. If you plan to use it the lens more than occasionally, spend the extra $$$ on a good lens.
Adaptor lenses Digital
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I have used adaptor lenses with digital cameras for several years with mixed results. Like most contributors on this site, I have found that you clearly get what you pay for.
My current camera is a Nikon Coolpix 5700 and I needed more wide angle than the 34mm or so equivalent that the lens zooms to at the widest setting. I would have bought Nikon original, but since only 0.8x and fisheye are available, I decided on a Raynox DCR-6600PRO, it is a 0.66x adapter. I have used this lens both outdoors and indoors with external flash with decent results. At f2.8, the sharpness decreases noticably around the edges if viewed with 100% zoom on a computer screen. At f5.6, I cannot detect any degradation. I can detect minor vignetting in the top right corner only.
I also bought a cheaper 0.38x lens made by Bower. Though sold on eBay specifically for my camera, it does not work at all. The vignetting is so bad I have to zoom in quite a bit to get rid of the shadows in all 4 corners. Effective full frame usability puts it more at the 0.7x level with Nikon Coolpix 5700, even with a very short barrel adapter.
I previously used a Nikon Coolpix 880 with Nikon original 0.63x and 3x adapters. These lenses provided excellent quality. Again, you get what you pay for with adapter lenses. Do your research and make sure that the lens you buy will actually work with your camera. If you plan to use it the lens more than occasionally, spend the extra $$$ on a good lens.