I wrote: "It's one of only two manual-focus 300/4 or 300/4.5 K-mount lenses that I know of that has a reasonably close focus (2.5 m) AND a tripod mount. The other is the multicoated Soligor 300/4.5 PKA (which weighs just 740 g, and uses 72mm filters)."
To clarify: I don't know how closely the Soligor focuses. Also, there appear to be two Soligor 300/4.5s. The Tele Auto (72mm filter) was introduced in 1977 for $199. The Auto Compact--evidently, its replacement--was introduced in 1978 for $255. If the Tele Auto weighed 740 g, as my records state, I can't imagine how the Auto Compact could weigh any less. Perhaps, like the Pentax 300/4M* and A*, the Auto Compact omits the tripod ring. One of these is for sale for $165 at http://www.thompsonphoto.com/indexused.html (96713 USED PENTAX MT PK SOLIGOR 300 4.5 $165.00) That's an incredibly low price for a multicoated, autodiaphragm K-mount 300/4.5. [EMAIL PROTECTED]