This is a well respected ultra-wide angle fixed focal length Minolta lens. This lens will be a 30mm equivalent on a 1.5 crop camera. It is not seen too often for sale so it is hard to determine a typical price for this lens.
Links below to reviews and current Ebay auctions for this lens.
 |
| Sony SAL-20F28 20mm f/2.8 AF Lens for Alpha & Minolta Maxxum Series | |
 |
$748.00 Time Remaining: 17d 1h 30m Buy It Now for only: $748.00 Buy It Now |
| Sony SAL-20F28 20mm f/2.8 AF Lens for Alpha & Minolta | |
 |
$748.00 Time Remaining: 29d 42m Buy It Now for only: $748.00 Buy It Now |
| SONY / Minolta Maxxum 20mm AF f/2.8 Prime Ultra Wide Angle ~Mint Condition~ | |
 |
$349.99 Time Remaining: 29d 3h 18m Buy It Now for only: $349.99 Buy It Now |
