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I've been looking at these (or similar) on Deal Extreme. I've seen a 500 f6.3 at about $170US and an f8 at $119US. On my A77 2/3 sensor it work work out as 750mm and a heck of a lot cheaper than an APO.
I have the new Tamron 18-200 (24-300) and my old KM 70-300 (105-450) lenses to cover most uses and a cheapish 500mm (750mm) Mak lens would make an interesting addition to play with.
Have to try the Tamron and the KM guided when the clouds naff off.
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