Hello Niall

As far as I am aware, Sony do not produce an equivalent lens. However, there is a cost effective option which will give good results at the cost of  'elegance' - a reverser ring like this one for your existing lenses:

http://www.srb-griturn.com/sony-alpha-reversing-rings-77-p.asp

You could always get the Canon that you mentioned with an adapter ring but that would certainly be a lot more.

Thanks,

Simon

I'm pretty sure the only 'conventional' Nikon macros are the Micro Nikkors which only go up to 1:1 life size. Greater magnification is usually gained with bellows or extension tubes. Macro Nikkors are designed go to greater magnification but they're usually very specialised fittings for applied photography and you need special adaptors just to fit standard Nikon mounts.

Your choices, apart from the Canon + adaptor, are an (even more expensive) Minolta 3x-1x which goes to 3:1, and the wild and wacky Yasuhara-Nanoha (5:1) the latter two having the advantage of being native Sony a-mount.

As Simon pointed out above, you can get very good results with a reversing ring and just about any conventional lens, extending the magnification beyond 5:1 (if you're that way inclined) with extensions. It's a lot of fun, if a bit technical; a good place to start if you're just looking to experiment with super macro.

Cheers

Mick