LBJ2 wrote:
If true FE-Emount, and not just a bolt-on to a DSLR design, what a way for Sigma to jump into the FE system!
Why would a lens of the focal length require a special design fo FE mount? Are you thinking that the f/1.4 At 105mm requires consideration of cover glass thickness?
No, but if this is DSLR optical & AF motor design I don't see why we should expect this to be any better in focusing than a Art 85/1.4 or ART 135/1.8 when combined with MC-11.
To my understanding there are no magical AF motors available that would work equally well in PDAF and CDAF for heavy focus groups such as one surely found 105/1.4. Sony DDSSM motors (as found in ZA50/1.4 and GM 85/1.4) are ok, but they are a bit noisy and are a bit of "compromize in everything".
Based on the pic (said to show Canon EF version, "DG" text indicates this is an FF DSLR lens) available, with the "windowed" distance scale (never seen such in Sony E mount mirrorless lens) I'm gonna have to quess that if the pic is real there will be no FE mount version; this would be 1st AF lens that uses same optical/AF-formula for DSLR and mirrorless. Hope I'm wrong though. Would be a very nice addition to FE lens seelction.
LBJ2 wrote:
If true FE-Emount, and not just a bolt-on to a DSLR design, what a way for Sigma to jump into the FE system!
Why would a lens of the focal length require a special design fo FE mount? Are you thinking that the f/1.4 At 105mm requires consideration of cover glass thickness?
No, but if this is DSLR optical & AF motor design I don't see why we should expect this to be any better in focusing than a Art 85/1.4 or ART 135/1.8 when combined with MC-11.
To my understanding there are no magical AF motors available that would work equally well in PDAF and CDAF for heavy focus groups such as one surely found 105/1.4. Sony DDSSM motors (as found in ZA50/1.4 and GM 85/1.4) are ok, but they are a bit noisy and are a bit of "compromize in everything".
Based on the pic (said to show Canon EF version) available, with the "windowed" distance scale (never seen such in Sony E mount mirrorless lens) I'm gonna have to quess that if the pic is real there will be no FE mount version; this would be 1st AF lens that uses same optical/AF-formula for DSLR and mirrorless. Hope I'm wrong though. Would be a very nice addition to FE lens seelction.
Feb 25, 2018 at 10:54 AM
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