zugzwang2 wrote: Charlie N wrote:
Updated with the latest nokishita posting
The 90mm lens sounds good--but there's this: "The lens also uses your camera's optical correction functionality, that way it improves rendering performance while reducing the size and weight of the lens." I suppose that that caveat suggests in part that distortion correction may often be useful and that the expected (uncorrected) high resolution results in initial reports will require some interpretation.
The camera’s optical correction function can also mean correction of lateral CA. Notice ho2 only correction of acial CA was mentioned in the text, though five SLD elements and aspherics mean that even lateral CA may be well corrected optically. This leaves distortion, but a 90mm is not likely to have more than 2% native optical distortion, which shouldn’t be a deal breaker.
The Sigma 24/3.5 has very little optical distortion, particularly compared to the Sony 24/2.8 G at a staggering ~8%. The 45/2.8 is also nice in this regard, so in summary I think Sigma will strike a good balance
The optical design of the 90/2.8 sounds outright ambitious with five SLD elements, and a statement describing something that sounds like an apochromat stopping short only of saying that word.
Sep 02, 2021 at 05:42 PM
Previous versions of bjornthun's message #15697590 « Sigma 90mm and 24mm F2 DG DN | Contemporary »
