Is this a prototype of the smc Pentax-A★ 600mm f/5.6 ED [IF]?

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Mistral75
Mistral75 Regular Member • Posts: 332
Is this a prototype of the smc Pentax-A★ 600mm f/5.6 ED [IF]?
2

An smc Pentax-A★ 600mm f/5.6 ED [IF]

  • which is black instead of white-grey
  • the front part of which slightly differs from that of the standard lens (e.g. the cone at the rear is more abrupt)
  • with a detachable lens hood instead of a built-in one

just appeared on eBay:

【Rare!! MINT】 Pentax SMC Pentax-A* 600mm f/5.6 ED IF Tele Lens From Japan #351 | eBay

Could it be a prototype lens?

The standard smc Pentax-A★ 600mm f/5.6 ED [IF:

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mxx
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