7D MFA lens "registration"

Started Nov 19, 2011 | Discussions thread
wallybarthman Regular Member • Posts: 360
Re: 7D MFA lens "registration"

riderfanreturns wrote:

I have the older DG series and it reports in when attached to my 70-200 F2.8 IS MkI. I wonder why they changed that on the DGX?

The DGX series is optically identical to the DG series - but they added circuitry that makes sure that the TC reports the true aperture to the camera regardless of what lens its attached to. So if I use my Kenko DGX with my 85 f1.8 the largest aperture I can select is 2.5 - even though the 85 f1.8 is not designed for use with teleconverters. It also reports the true focal length regardless of whether than lens is a reporting lens or not.

 wallybarthman's gear list:wallybarthman's gear list
Canon EOS-1D Mark II Canon EOS 7D Canon EF 35mm F2.0 Canon EF 50mm f/1.4 USM Canon EF 85mm f/1.8 USM +10 more
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