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2x zoom lens with same absolute aperture instead of extender ?

Started Aug 16, 2015 | Questions thread
tonyjr
tonyjr Veteran Member • Posts: 5,295
Re: 2x zoom lens with same absolute aperture instead of extender ?

Unless I misunderstand , my 17-55 2.8 is  over 2 X and my 70-200 mk II is also . If I put the 2X II on the 70-200 , it puts it at about 5.6

 tonyjr's gear list:tonyjr's gear list
Canon EOS 400D Canon EOS 7D Canon EF 35mm F2.0 Canon EF-S 10-22mm F3.5-4.5 USM Canon EF-S 17-55mm f/2.8 IS USM +14 more
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