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The
major benefit to using an extension tube is the cost.
If your budget is limited and won't allow you to purchase
an expensive macro lens, then extension tubes will give
you some satisfaction until your able to afford to buy
the real deal. Because of the low cost of my dirt cheap
extension tubes compared to the cost of a brand name extension
tube which you could expect to pay around $180US and up,
you might think that purchasing cheap tubes will give
you far less quality pictures, but this is not the case.
The only difference between the cheap brand and the expensive
brand is that the cheap extension tubes takes away the
ability to autofocus. Therefore if you purchase a cheap
set of extension tubes you will have to use manual mode.
Many photographers wouldn't see this as a problem!
Extension
tubes are very light and compact compared to a macro lens.
I carry mine with me every time I go out on a photo shoot.
Extension
tubes work with most camera lenses, with the exemption
of those with very short focal lengths.
Extension
tubes can be used with telephoto lenses. A long telephoto
lens is great for making objects bigger, but the focal
length is huge. An extension tube will allow you to enlarge
with the telephoto but still maintain a good working distance.
Extension
tubes are simple and hardy. There's not a lot that can
go wrong with them.
Note
- Extension tubes can also be used with macro lenses.
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Lens Extension
Tubes 
