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Forum: Pentax SLR Lens Discussion
12-29-2015, 11:19 PM
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As a very odd happenstance, I just purchased one of these old sigma tc's today from a brick and mortar store in their going out of business sale. It's got the gold box, 5/5 optical formula, not designated APO. I got this one for $50, and they had the EX APO version for $100. The latter seems to go cheaper on eBay.
I had just read this thread a couple days prior, did a similar internet search in the store, and pretty much only found your review Wild Mark.
Can you fill me in on why you think the tc will perform better than cropping at far field to infinity, and specifically - what designates "far field"? I wanted to do some testing on moon shots tonight, but the clouds were too thick.
The store was an interesting one. I found a set of extension tubes with Pentax AF contacts, a FA 20-35/4 for $100, and a manual focus sigma 75-300/4-5.6 APO for $40. The shop had been around for 65 years, and you could tell they rarely cleared out old inventory.
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