You can get them for cheap on ebay. Just seach for canon, efs, extension, and tubes. All they do is hold your lens further from the image plane, there are no optics in them, so cheap ones work just as good.
You can get them for cheap on ebay. Just seach for canon, efs, extension, and tubes. All they do is hold your lens further from the image plane, there are no optics in them, so cheap ones work just as good.
Can that app do white balance? To take the blue out of LEDs I find it works best if you shoot in raw and manually set the white balance using a dropper tool on a piece of something white. Works like a charm...