Sony published a new patent for a Mirror lens having a focal length of 250mm and f/4.5 aperture. It’s designed for APS-C E-mount cameras. A perfect lens to spy the neighbourhood take pictures of birds :)
By the way, if you are looking for an E-mount mirror lens you can also buy that Albinar 300mm on Amazon US (Click here) or [shoplink 26152 ebay]eBay (Click here)[/shoplink].
via Egami.