Pentax Ultra-Wide Prime Lenses
| Lens | Elements- Groups | Min. Focus Distance (m) | Filter Dia- meter (mm) | Lens Diameter x Length (mm) | Weight (g) |
|---|---|---|---|---|---|
| K 8.4/2.8 Fish-Eye | 10-7 | — | — | 81.6 x 139.7 | unknown |
| DA 14/2.8 ED [IF] | 12-11 | 0.17 | 77 | 83.5 x 69 | 420 |
| K 15/3.5 | 13-12 | 0.3 | — | 80 x 82 | 600 |
| K 15/3.5 AL | 13-12 | 0.3 | — | 80 x 81.5 | 550 |
| A 15/3.5 | 13-12 | 0.3 | — | 80 x 82 | 595 |
| DA 15/4 AL ED Limited | 8-6 | 0.18 | 49 | 63 x 39.5 | 212 |
| HD DA 15/4 AL ED Limited | 8-6 | 0.18 | 49 | 63 x 39.5 | 189 |
| A 16/2.8 Fish-Eye | 9-7 | 0.2 | — | 65 x 56 | 320 |
| K 17/4 Fish-Eye | 11-7 | 0.2 | — | 65 x 34 | 235 |
| K 18/3.5 | 12-11 | 0.25 | 58 | 63 x 62 | 295 |
| A 20/2.8 | 10-9 | 0.25 | 67 | 70 x 43.5 | 245 |
| FA 20/2.8 | 10-9 | 0.25 | 67 | 70 x 43.5 | 255 |
| K 20/4 | 12-10 | 0.25 | 58 | 63 x 57 | 300 |
| M 20/4 | 8-8 | 0.25 | 49 | 63 x 30 | 150 |
| HD DFA 21/2.4 Limited | 11-8 | 0.18 | 67 | 89 x 74 | 416 |
| DA 21/3.2 AL Limited | 8-5 | 0.2 | 49 | 63 x 25 | 140 |
| HD DA 21/3.2 AL Limited | 8-5 | 0.2 | 49 | 63 x 25 | 134 |
| FA* 24/2 AL [IF] | 11-9 | 0.3 | 67 | 73 x 66 | 405 |
| K 24/2.8 | 9-8 | 0.25 | 52 | 63 x 42 | 195 |
| A 24/2.8 | 9-8 | 0.25 | 52 | 63 x 42 | 205 |
| K 24/3.5 | 9-8 | 0.25 | 58 | 63 x 46 | 248 |