A few years ago the answer to this question would have been everything. Especially for the new full-frame 7 series cameras, the line-up was woefully poor. In the last three years Sony (and Zeiss) have really stepped up to the plate and launched a goodly selection of high end lenses for the FE (full-frame e-mount) cameras. In fact at this point the wide angle options are pretty much complete. For the normal range there are several excellent options including a 50mm f/1.4, an 85 f/1.4, a 100mm macro and the recently added 70 – 200 F2.8 G Master zoom.
What is left? Telephotos. Now, Sony has added a 100-400mm zoom. But I would say that Sony is lacking a telephoto zoom that reaches 600mm. If I were a sports photographer I’d be looking for a 600mm F/4. But that is a very expensive lens. I think what would be appropriate is for someone like Sigma or Tamron to produce an e-mount version of their existing 150 – 600mm zooms. This would provide the compromise between price and capability that a large number of amateur wildlife and sports shooters would be willing to pay for. In fact I know that if Sony produced this lens it would probably be too expensive. So it is a natural fit for these two third party manufacturers.
The other thing that I would like to see Sony produce is a 200mm macro. I currently use the Minolta version with an adapter but since it’s a screw-drive focus system it either has to be used as a manual focus on the LA-EA3 or with the “translucent mirror of the LA-EA4. Both of these are compromises. I also think the chance of Sony manufacturing this lens is zero. So once again I think this is a good opportunity for Sigma. They already have a long focal length macro and this would probably only require adapting it to the e-mount. This lens probably won’t have as many buyers as a 150-600mm zoom. But I throw it out there because I’m greedy and annoying.
There is a rumor on Sonyalpharumors.com that Sigma is about to announce a major effort to break into the FE market. The initial offering has been guessed to be a 35mm f/1.4. This is a lens that Sigma has done a good job on already in their Art Lens series. Whether it would require a major modification to work on the e-mount is a question.
So if we assume Sigma is looking to get the maximum bang for their buck in the Sony ecosystem then they should go for some of the open focal lengths that they already have technology for. In that case both the 150-600 and 200mm macro are lenses they already make and represent gaps in the Sony line-up.
If you’re listening Sigma, get busy. You make money and I get to stop complaining. A win-win.
You’re welcome Sigma!