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Sigma 2470mm FE lens at Amazon, BHphoto, Adorama, Calumet DE, FocusCamera WexUK Opticallimits reviewed the Sigma 2470mm f/28 FE lens and concluded The Sigma 2470mm f/28 DG DN ART shows many of the strengths and weaknesses of a fast standardThe Sigma 2470mm f/28 DG DN ART uses a noiseless stepping motor for autofocusing The AF speed is good although it doesn't reach the levels of the Sony 2470mm f/28GM Manual focusing works "by wire" This works reasonably well in reallife situations although we have seen more precise implementationsThe Sigma 2470mm f/28 EX DG HSM Lens is available in Canon (reviewed), Nikon, Pentax, Sony/Minolta and Sigma mounts My standard disclaimer There are potential issues with third party lenses Since Sigma reverse engineers (vs licenses) manufacturer AF routines, there is always the possibility that a DSLR body might not support a (likely Affordable Performance A Review Of The Sigma 24 70mm F 2 8 Dg Dn Art Lens Fstoppers Sigma 24 70mm f2 8 sony rev