Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
About E-mount licensing (Sigma says: no teleconverter because of licensing)
This review of the Sigma 100-400mm F5-6.3 DG DN OS C...

... reports a statement from Sigma:

Quote:Regarding your question on the teleconverter for Sony E mount, yes, your question is quite understandable. As you noticed, yes, we released a new TELE CONVERTER TC-1411/2011 for L-mount camera, but not for Sony E-mount camera, which must be unreasonable for you. As you may already know, we are licensed from Sony to design and produce Sony E-mount lenses, and it must be done in accordance with Sony E-mount specifications and license agreement. In the specifications and agreement, there are no statements on teleconverters. So, this is why we cannot design and produce Sony-E mount teleconverters. So, at this point, we have no concrete plan and schedule for making TELE CONVERTER TC-1411 in Sony E-mount. 

It's clearly my fault, but I understood that E-mount specs were open and third-parties didn't need a license for developing lenses.


Sony a6300, Sony a6000, Sony NEX-6, Sony E 10-18mm F4 OSS, Sony Zeiss Vario-Tessar T* E 16-70mm F4 ZA OSS, Sony FE 70-200mm F4 G OSS, Sigma 150-600mm Æ’/5-6.3 DG OS HSM Contemporary, Samyang 12mm Æ’/2, Sigma 30mm F2.8 DN | A, Meyer Gorlitz Trioplan 100mm Æ’/2.8, Samyang 8mm Æ’/3.5 fish-eye II | Zenit Helios 44-2 58mm Æ’/2 
Plus some legacy Nikkor lenses.
I think it's normal that you have to sign a contract in order to obtain the license - even if it's free of charge.
As a manufacturer, you have to commit to comply to the specification and to be allowed to use the trademark.
Chief Editor -

Doing all things Canon, MFT, Sony and Fuji
Without licence, manufacturers appear to have no issue labelling lenses as being for Nikon F-mount or Canon EOS/EF-mount...
As simple as that:

FWIW, I just read that Zeiss never received an official license for X-mount. Quite surprising actually - they released lenses in the very early days there.
Chief Editor -

Doing all things Canon, MFT, Sony and Fuji
Maybe Sigma just needs to ask Sony for a clarification. No reason not to allow making teleconverters if they're allowed to make lenses.

Forum Jump:

Users browsing this thread:
1 Guest(s)