I have an old sigma lens from my predigital days.
It says: Sigma Zoom (& a green symbol I can't read) 1:4~5 f=75~250mm. Multi coated E-911656. Made in Japan. For Pentax-K. It also has an achromatic macro lens attachment.
I'm not trying to sell it here. Just interested to know if it's useful, should i sell it on ebay (to contribute to my new canon) and about how much it might be worth?
Given that information, how should i describe it if i put it up on ebay?