The Sigma 50mm macros are almost as good as Minolta's and generally a little cheaper. There are 3 (at least) versions, which are all good. The newest versions are part of Sigma's "EX" series (the "EX" and the "EX DG") and the older version is simply the 50mm f2.8 macro. Like all macros these are slow focusing but extremely sharp. Prices vary considerably, but expect to pay $100+.
Links for reviews and current Ebay auctions for this lens below. (Links open in a new window)
Dyxum Review - Sigma 50mm f2.8 EX
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Dyxum Review - Sigma 50mm f2.8 EX DG (Digital Coating)
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| Sigma 50mm f/2.8 AF EX DG Macro Lens Minolta/Sony NEW | |
 | $369.00 Time Remaining: 5h 14m Buy It Now for only: $369.00 Buy It Now |
| Sigma 50mm f/2.8 EX DG Macro Lens Minolta/Sony+ KIT NEW | |
 | $376.97 Time Remaining: 5h 15m Buy It Now for only: $376.97 Buy It Now |
| Sigma 50mm f/2.8 AF EX DG Macro Lens Minolta/Sony NEW | |
 | $369.00 Time Remaining: 1d 6h 6m |
| Sigma 50mm f/2.8 EX DG Macro Lens Minolta/Sony+ KIT NEW | |
 | $376.97 Time Remaining: 1d 6h 6m |
| Sigma 50mm f/2.8 AF EX DG Macro Lens Minolta/Sony NEW | |
 | $369.00 Time Remaining: 3d 6h 6m |
| Sigma 50mm f/2.8 EX DG Macro Lens Minolta/Sony+ KIT NEW | |
 | $376.97 Time Remaining: 3d 6h 6m |
| Sigma AF 2,8 50mm Macro Multi Coated. Für Minolta.Free Shipping Worldwide. | |
 | $190.83 Time Remaining: 6d 8h 44m Buy It Now for only: $190.83 Buy It Now |
| Sigma 50mm F2.8 EX DG Macro Lens Kit for Sony/Minolta Free World Shipping | |
 | $439.98 Time Remaining: 17d 16h 58m Buy It Now for only: $439.98 Buy It Now |
| Sigma 50mm F2.8 EX DG Macro Lens for Sony/Minolta Free USA Shipping | |
 | $369.98 Time Remaining: 17d 16h 58m Buy It Now for only: $369.98 Buy It Now |
| Sigma 50mm f2.8 EX Macro DG for Minolta Max 346205 | |
 | $309.00 Time Remaining: 19d 17h 2m Buy It Now for only: $309.00 Buy It Now |