The second 2x tc was a non reporting one. The reason that it's showing f6.3 is because I stopped it down a third. I add the crop factor. No real reason, it just sounds more impressive. :D davev.
Guest
13-May-2014 03:19
Personally I usually don't include the cropping factor when calculating mm since I don't have a FF or film camera for comparason. By the way wouldn't the f stop be f11 if your lens was set at 2.8??? Paul