This lens is virtually identical to its predecessor, the 15/3.5. The only differences are the A-style focusing and aperture rings, an extra "A" aperture setting, slightly softened edges, and five aperture blades of the instead of the six of the 15/3.5.
Although it is very seldom that one finds the A 15/3.5 for sale used, any good photo store should be able to order it new.
|Exact Name||smc PENTAX-A 1:3.5 15mm|
|Year of Introduction||1984|
|Sold with Hood||—||—|
|Sold with Case||hard case: HE-120||soft case: S90-100|
|Optical Formula||13 elements in 12 groups|
|Aperture Range||f/3.5 ~ f/22|
|Number of Aperture Blades||5|
|Minimum Focusing Distance||0.3 m|
|Maximum Magnification||0.08 X|
|Built-in Filters||Y48(Y2), Skylight, none, L39(UV), O56(O2)|
|Maximum Diameter||80 mm|
|Cap||metal slip-on cap, 80 mm|
|Fitting Hood(s)||not applicable|
|Fitting Case(s)||hard case: HE-120
soft case: S90-100
This lens uses the same optical construction as the 15/3.5 but supposedly features an improved SMC coating. It is then reasonable to assume that the "A" lens boasts somewhat better ghost/glare suppression while all other optical indicators remain virtually identical.
Although I know of no side-by-side comparisons between the two lenses, user reports tend agree with the above.