06-05-2017, 08:18 AM
Quote:To me it seems you made that practice up. I have not read anywhere about people using a TC to use APS-C lenses on FF in the transition period.Agreed, I never heard about that either. Some people I knew were using some crummy film (but naturally full-frame) lenses like the 28-90 or 28-105 with their 5D, maybe they were thinking that FF is a magic bullet that would have made even a bad lens like this shine. Of course none of that stuck, and before long they were all equipped with the likes of 24-105 or 24-70 L lenses.
There were no teleconverters on which you could mount the EF-S 17-55mm f2.8 IS USM, or other EF-S lenses.
That said, I see no issue with using my 1.7x (measured more like 1.6x) with my Ultra-Micro-Nikkor 55mm f2 which has too small an image circle on FF, or my modified EF-S 10-18mm f4.5-5.6 IS STM. With the former it crops away the dark corners, and with the latter it gives the lens' full range it was designed for in the 1st place.
P. S. What TC are you using with that Canon setup?