Under certain conditions, the NA-iTTL version of the Sigma EF-500 DG SUPER, EF-500 DG ST and EM-140 DG model flashguns will not fire when used with the Nikon D40x.
To overcome this, we will start supplying a free-upgrade service to our customers.
We deeply apologize for any inconvenience this may have caused to our customers.
List of flashguns require upgrade for D40x
- ELECTRONIC FLASH EF-500 DG SUPER NA-iTTL
- ELECTRONIC FLASH EF-500 DG ST NA-iTTL
- ELECTRONIC FLASH MACRO EM-140 DG NA-iTTL
For further information, please contact to nearest authorized Sigma Service Station.
http://www.sigma-photo.co.jp/english/network/index.htm
We will post further information regarding service procedure and time-scales in due course.