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--I contend that we are both atheists. I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours.
-Stephen Roberts
Hi,
Advantages:
Great for low light- they do not reduce the light input like extension tubes and teleconverters do.
They come in varying powers- usually enough to combine all the way up to 7X.
Price- Whether you get a generic filter kit on eBay or use the Cokin system, they are pretty much the cheapest solution around.
Disadvantages:
Optical quality- Unless you get upper-end ones, some degradation of picture quality can be expected. Personally, I don't find this to be that much of a handicap. I use Hoya brand and Cokin brand.
Working distance- They reduce the working distance by 1/4 to 1/2 or more. This can be an issue with live animals. They also lower the hyperfocal length of the lens. That is the amount of the picture that is in focus.
Personally, I would start with extension tubes IF and only IF you have enough light (think metal halide or multiple flashes). But for versatility, the close-up lenses can't be beat. They can be attached to any lens, making a consumer zoom into a half-decent macro in a pinch. I regularly use them on my 100-400mm lens for butterflies and flowers.
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