Guys I have a Canon 7D aps-c with 1.6x crop, and I have a Samyang 8mm for Canon cameras.
Here is my question. As the lens does not have electronic contacts on it to connect to the camera, there is no EXIF data. When I wanna use programs like PTGui, it asks me for the focal length and multiplier, which I assume is 8 mm and 1.6. But what about the other programs like Autopano Giga?? In APG you can only define the focal length. So shall I write the 8 mm or shall I multiply the 8mm by 1.6 and then the result would be my actual focal length?