I have to use a lamp to get my picture bright and without shadow
Of course. This is essential.
and if I zoom it completely blurs
Don't use the zoom; rather, adjust the distance between the camera and coin with the lens zoomed all the way out. I'm guessing if you start at about 12" from the coin, you'll start seeing acceptable results. Maybe not as large as you like, but that can be fixed. For the moment, concentrate on getting images that are in focus and the right color - the rest can come later.
The cardinal rules of coin photography:
1. Camera needs to be on a firm mount. A camera stand or tripod, so as to minimize shake. Yes, some take decent pics handheld, but not everybody has hands that steady and if you can't do it right every single time, you'll just frustrate yourself.
2. Camera and coin exactly parallel. Macro photography involves very little depth of field, and the minute the camera tilts relative to the subject, you probably lose focus across the whole surface of the coin.
3. Delayed or remote shutter. Remember, miniscule depth of field. If you shake the camera even a tiny bit while pushing the button, your photo will not be in focus.Learn all this first.
An add-on lens will only make that process more difficult, because the "sweet spot" where everything works correctly will become much smaller.
I can't express an opinion about your purchase, I have no experience with that lens. I will say, there's stuff in there you don't need - as in, everything except the lens itself - for coin photography. The lens kit itself is available for $18:http://www.amazon.com/Vivitar-Close...87971&sr=8-4
Even if it turns out to be crap, I'd spend $18 to find out.
Optics is an area where you very much get what you pay for, but on the other hand coin photography is among the simpler photographic tasks for a given lens. It's quite possible that a cheap macro add-on will give acceptable results under such strict conditions.
Don't forget, though, unless you get the basics down pat, anything you add will only frustrate you.
The best thing about a bicycle is that it uses no gasoline, therefore the chance of fiery death is greatly reduced.
First Catman, then Gary Burke and now Bigg Fredd - there's one heck of a coin club in Heaven.