Tamron has filed a patent application that discloses the optical design of the proposed Tamron 17-50mm F/4 lens . The source said that the manufacturer intends to release this lens, and its official announcement may take place this year.
The sources also claim that the optical formula of the lens is designed for use with full-frame sensors and emphasize that it will receive an internal zoom design. At the same time, it is not known for which cameras this lens can be presented.
photo: asobinet
In addition, according to the documentation provided, the Tamron 17-50mm F / 4 optical formula includes the following parameters: focal length from 17.52 mm to 48.483 mm, aperture F: 4.120, half-angle of view from 110.747 ° to 47.366 °, height 21.633 mm, length 134.456 mm, as well as back focus in the range from 18.462 mm to 50.815 mm.
This is all the information on this lens so far.
Let me also remind you that we previously reported that according to the source, Sigma is going to release an analogue of the Tamron 35-150mm F / 2-2.8 Di III VXD lens, developing its own lens with a focal length of 50-140mm and a constant aperture of F / 2.8. The new Sigma lens is expected to be affordable. In addition, Sigma is also known to be working on improvements to its Sigma 70-200mm F/2.8 lens.
