Getting better magnification

[IdPlease]

I have a Sigma 17-70 f/2.8 - 4.5 DC on a Sony fit. I love the lens and it has a decent 1:2.3 magnification, but i'd like to make it higher.

Is there any kind of magnifiying glass that I could use on the filter threads that will allow a more 1:1 or higher. It already allows focus upto about 20mm, almost touching the lens but would like to get a higher magnification.

I know I can purchase a "real" macro lens like the Sigma 105 etc, but it's a bit to shell out when my current lens is "almost" there.

Thanks

Carl

 

[arclight]

You can get close up filters in various strengths.
Just don't expect the same image quality as you'd get with a prime macro lens.

If you google close up filters you'll probably get on the right track.
I have seen ads in mags for them, but don't recall what company.

 

[trapper501]

How about extension tubes?

I have used a so called close up filter (they aren't filters but I think get called that because they screw onto the filter thread)

I was pleased with the results, but I was using a high quality close up lens (canon 500D) on a canon L lens. (70-200 f4 L)

I think the risk is that they introduce problems and magnify those already there.

Edit: The Raynox seem to be excellent, I don't have one but I've seen superb results

 

[IdPlease]

Thanks, i've had a look around the forums (should have used search! ) and the +5 diopter filter seems to be able to offer me nearly the 1:1 i'm looking for @70mm.

Only real way of knowing is getting one I guess. I know it not beat a real macro prime but as I said, I really like my current Sigma lens, and it's almost there (1:2.3) but thats at like 10/20mm from the subject.

Not considered extension tubes, but will have a look around.


Thanks for input..