can i get doubled when i use Canon -Extender EF 2x III to my cannon 600d 55-250mm to 500mm
from the canon usa website:
This lens is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L. Additionally, please see the lens and/or camera body manual for full compatibility information with the Extender EF 2X III.
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