Then here is the optical formula of the Old FA 35/2 AL:-
Next, here are the specifications and physical parameters of the two lenses:-
| Parameter | DAL 35/2.4 AL | FA 35/2 AL |
| Focal Length | 35mm | 35mm |
| Aperture Range | f/2.4 - f/22 | f/2.0 - f/22 |
| Optical Construction | 6 Elements in 5 Groups, 1 Aspherical Element | 6 Elements in 5 Groups, 1 Aspherical Element |
| Number of Aperture Blades | 6 | 6 |
| Minimum Focusing Distance and Magnification | 0.3m(1ft) at 0.17X | 0.3m(1ft) at 0.17X |
| Filter Thread Size | 49mm | 49mm |
| Physical Size (Diameter and Length) | 63mm x 45mm | 64mm x 45mm |
| Weight | 124g | 195g |
Are they just looking almost *identical*?! :-o
Pentax/Hoya is just so clever to re-package the old lens and minimize its weight by removing everything that is considered heavy and "unnecessary" (including the focus/distance scale) and then build an all-plastic lens that is as easy to paint as those plastic toys! Really brilliant! My Thumb Up!! ;-D
Another good thing is that this new DA(L) lens is *possibly* 135 Full Frame compatible! And, as there is no lens hood bundled, there will be no compatibility issue for whether it is or will be used on an APS-C cropped DSLRs or on Full Frame ones (if any in the future).