The little Horseman would have a hard time taking advantage of the 150 Sironar-S's larger image circle so why waste the money? Likewise a 135 is very close to a 150 in practice. So even if you settled for a lowly 135/5.6 Sironar-N, it would most likely be the lens you keep forever.
And they sell in mint condition for about $300 and change on eBay.
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