Originally posted by G and T Jean's lens is the 55/2.2 built in 1957,they were only made for a year I believe, but there is another model built in 1961-1962 that is much more common and were the standard lens on the S1.
Jean's lens was the cheaper option to the Takumar 55/1.8 for the S and are rather hard to find.
Glenn
Hey Glenn.
I disagree somewhat. Yes, the 55/2.2 was produced in 1957. The Asahi Pentax S was in production from spring of 1958 until fall of 1958. The camera was sold with the common Takumar 55mm f2.2 that was still around that spring. The first production run had a single scale, while the later one found on the S had a dual scale, meters and feet.
The S was also seen with the 55mm f1.8, that lens was developed during the fall of 1957, and in production only in 1958.
The original Asahi Pentax came with the 58mm f2.4, a direct inheritance from the Asahiflex, the only difference is the mount, Asahiflex had the m37. There were some 19000 AP's produced that first year. About 1/3 were branded Tower in the US. Very impressive numbers IMHO. The S had a much lower production numbers Somewhere between 3 and 4 thousand.
I have both the m37 version and the m42 version of the 58mm f2.4. The m42 version was on a Tower 26 with the feet scale.
Then you have the Takumar 58mm f2.0. Don't know if this is more rare than the 55 f1.8, but in my opinion the 55/1.8 is a harder find. A funfact about the 58/2.0 is that this must be the first Pentax lens with a R-mark for infrared.
My copy of the Takumar 55mm f2.2 was on my Asahi Pentax S, chrome body. Is has a dual scale, meters and feet.
The standard lens for the S1 was Auto-Takumar 55mm f2.2.