billnikon wrote:
Spiratone, just like it's parent company Sigma, has and still do produce dubious quality glass, actually, they do not produce their own glass, the cheapest bidder produces their glass and they, Sigma, put the lens and glass together. Now, to your lens, it will make a fine paper weight, but, you can still get a few bucks for it on ebay.
IMHO, today, Sigma produces some exceptionally good lenses, especially in their ART line. Years ago -- not so good.