Mr. Kenji Nakagawa (responsible for Tamron Marketing Communications) © Albedo Media SL
The Spanish site DSLRmagazine asked Tamron if they plan to make lenses for the Sony A7 system. But the official answer was: “Currently we have no intention to cover this line of business, although we have a very good relationship with that particular brand.“
He also confirmed the new 15-30mm Sp lens can resolve the new 50 megapixel FF sensors. This fits with a rumor I got back many months ago. That source gave me the lens specs as first and also told me Sony would make a close to 50MP FF camera too. Question now is only WHEN that camera will be announced to fight back the Canon 5ds.