Video darkens during zoom with fixed aperture lens

Heiko Saele · January 9th, 2011, 04:04 PM

I just checked my Sigma 18-50mm f2.8 zoom lens on my 7D (firmware 1.2.2) and there is absolutely no exposure change when zooming in and out while recording video. Must be a lens issue, I guess.

Karl Edwards · January 11th, 2011, 08:36 AM

that's correct. this is a specific canon zoom lens issue (as described at length in the thread).

January 9th, 2011, 04:04 PM	#31
Heiko Saele Major Player Join Date: Mar 2007 Location: Wurzburg, Germany Posts: 316	I just checked my Sigma 18-50mm f2.8 zoom lens on my 7D (firmware 1.2.2) and there is absolutely no exposure change when zooming in and out while recording video. Must be a lens issue, I guess.

January 11th, 2011, 08:36 AM	#32
Karl Edwards Regular Crew Join Date: Apr 2010 Location: Toronto Canada Posts: 38	that's correct. this is a specific canon zoom lens issue (as described at length in the thread).