I received a second copy just to compare AF-C performance and both copies show AF-C inaccuracy depending on distance. This and many other reports confirm AF-C is not performing optimally. If Sigma is able to tweak the firmware to make AF-C's accuracy similar to AF-S, this lens will be perfect.
BTW, both copies I received were perfectly centered. Perhaps good news regarding copy variance.
Fred Miranda wrote:
I received a second copy just to compare AF-C performance and both copies show AF-C inaccuracy depending on distance. This and many other reports confirm AF-C is not performing optimally. If Sigma is able to tweak the firmware to make AF-C's accuracy similar to AF-S, this lens will be perfect.
BTW, both copies I received were perfectly centered. Perhaps good news regarding copy variance.
Hopefully the AF-C issue will be addressed soon. I picked up a 55mm Elpro 3 in anticipation of a firmware fix.
My copy is also well centered. I too am having AF-C issues, often (usually) off focus by just a hair when the subject is within 10 feet or so. No such problem with AF-S. MF works well although the large hood makes turning the focus ring a bit cramped.
Fred Miranda wrote:
I received a second copy just to compare AF-C performance and both copies show AF-C inaccuracy depending on distance. This and many other reports confirm AF-C is not performing optimally. If Sigma is able to tweak the firmware to make AF-C's accuracy similar to AF-S, this lens will be perfect.
BTW, both copies I received were perfectly centered. Perhaps good news regarding copy variance.
Same here. The 2 copies I tried both showed the AF-C issue, but both were also well centered.
Good to see that Sigma actually replied to you. They seem to ignore my mails about the AF-C issue.
Very curious if they'll be able to fix it.
fredmirandafan wrote:
In Canada, Sigma has 7 years warranty so hopefully they will fix this frustrating AF-C issue within 7 years before my warranty is over
Only 7 years? We get lifetime warranty on Sigma products
I really like the size and rendering of this lens, but need the AF to be accurate since it predominately for family. Sending back to BH and going to look at 35 or go back the 55 (which was the only lens I owned for the 2 years I had the R2).
How does the Sigma 45/2.8 compares to the new FE 35/1.8 at infinity distance?
The Sony performs better when stopped down to f/2.8 versus the Sigma wide open. However, the Sigma 45 takes the lead starting at f/4 and it is optimal at f/5.6.
Here is a comparison showing 1:1 crops the center, mid-field and extreme edge performance between these lenses at f/2.8 and f/5.6:
Center at f/2.8: They are similar but I see higher contrast from the Sony
Mid-field at f/2.8: This is the weak area for the Sigma wide open. It does only slightly worse compared to the Sony
Extreme edge at f/2.8: Sony has slightly higher contrast and resolution (Sigma is wide open)
Fred Miranda wrote: Infinity Performance vs Sony FE 35/1.8
How does the Sigma 45/2.8 compares to the new FE 35/1.8 at infinity distance?
The Sony performs better when stopped down to f/2.8 versus the Sigma wide open. However, the Sigma 45 takes the lead starting at f/4 and it is optimal at f/5.6.
Here is a comparison showing 1:1 crops the center, mid-field and extreme edge performance between these lenses at f/2.8 and f/5.6:
Mhhh looking at second pair.... Fred has some special trees there, they don’t do purple fringing... we need to know the species!
At infinity distance, the Sigma 45 performs slightly better compared to the Voigtlander 40mm f/1.2 at all apertures starting at f/2.8. Only the mid-field area is stronger for the Voigtlander but improves when focusing on it since the Sigma has a slight wavy field curvature.
Here is a comparison showing 1:1 crops the center, mid-field and extreme edge performance between these lenses at f/2.8 and f/5.6:
Center at f/2.8: The Sigma is wide open and they look similar at center but I give a small resolution edge for the Sigma.
Mid-field at f/2.8: This is the weak area for the Sigma wide open. The mid field improves when focusing on it. (wavy field curvature)
Extreme edges at f/2.8: The Sigma captures higher resolution and it's much less astigmatic
(Cont. Infinity Performance vs Voigtlander 40mm f/1.2)
Here are the crops at f/5.6 showing center, mid and extreme edge:
Center at f/5.6: The Sigma takes the lead at f/5.6
Mid-field at f/5.6: The Sigma catches up to the Voigtlander at mid-field but it is still not as good. At f/8, field curvature is masked by DOF and they look very similar at mid-field.
Extreme edges at f/5.6: The Sigma is significantly stronger here showing practically no astigmatism.
These fresh set of images once again show how versatile the Sigma is, it’s incredible they are able to produce a lens of such build and quality at this price.
