Leaked Sigma 24-105mm f/4 DG OS HSM - Printable Version +- Opticallimits (https://forum.opticallimits.com) +-- Forum: Forums (https://forum.opticallimits.com/forumdisplay.php?fid=4) +--- Forum: Just Talk (https://forum.opticallimits.com/forumdisplay.php?fid=17) +--- Thread: Leaked Sigma 24-105mm f/4 DG OS HSM (/showthread.php?tid=1701) |
Leaked Sigma 24-105mm f/4 DG OS HSM - frank - 10-14-2013 http://nikonrumors.com/2013/10/14/sigma-24-105mm-f4-dg-os-hsm-lens-leaked-already-listed-on-sigmas-website.aspx/ Looks nice but bulky. At wide end the resolution does not look promising at border/corner, however. Leaked Sigma 24-105mm f/4 DG OS HSM - youpii - 10-14-2013 It's official now http://www.sigma-global.com/en/lenses/cas/product/art/a_24_105_4/index.html Leaked Sigma 24-105mm f/4 DG OS HSM - JJ_SO - 10-14-2013 Frank, thanks for posting. Bulky, you're saying? Any design suggestions, how Sigma can get the constant f/4 into a smaller tube? Pass it forward to them... But I have to say, I don't want to re-buy my 77mm filters for 82mm, so that's a dealbreaking thing for me, too. As for weak corners: Apparently not that much weaker than the genuine lenses, when comparing PZ results of 24-85 and 24-120/4 VR. Also, not everybody's a friend of extending tubes. Anyway, I'll save my money for a 85/1.4 in the quality level of their 35/1.4 Leaked Sigma 24-105mm f/4 DG OS HSM - Rainer - 10-14-2013 Looks like a nice lens. The main question will be: How does it compare to its direct competitors (EF 24-105/4L IS and 24-120/4 VR), and how will its streetprice be. If it has an optical edge over these two lenses, it might find its share in the market. The 82mm threadsize for filters might help to reduce vignetting a bit. Albeit, I do not like the dual/coaxial tubes ... in this regard, I prefer the construction of the EF 24-105. Nevertheless, it will be interesting to see first hands-on reports and reviews. Rainer Leaked Sigma 24-105mm f/4 DG OS HSM - frank - 10-15-2013 Size/Weight comparison: Sigma 24-105mm f4: 88.6mm x 109.4mm, 885g, 82mm filter Canon 24-105mm f4: 83.5mm x 107mm, 670g, 77mm filter Nikon 24-120mm f4: 84mm x 103mm, 670g, 77mm filter MTF chart comparison: The Sigma: The Canon: The Nikon: Leaked Sigma 24-105mm f/4 DG OS HSM - frank - 10-15-2013 Quote:Frank, thanks for posting. When compared to the Nikon/Cannon counterpart, 215g increase in weight, and 82mm vs 77mm in filter size. These two numbers made me say that the Sigma is "bulky". 215g increase in weight is significant, I think. In absolute numbers, I also think ~900g is too weighty for a constant f4 and standard zoom lens. Leaked Sigma 24-105mm f/4 DG OS HSM - JJ_SO - 10-15-2013 The MTF curves look similar but let's keep in mind: Nikon MTF curves stop at 30 lines/mm. They don't say anything about max. resolution or contrast at higher frequencies. I'd like to quote the user Ade from NR Forum who made me understand MTF a bit better: See more at: http://forum.nikonrumors.com/discussion/1160/modulation-transfer-function-what-does-it-mean/p1#sthash.NE1fWIK4.dpuf Quote:<b>Nikon MTF</b> I'd also consider it a heavy lens. On the other side, if 82mm filter thread would reduce the vignetting, it could become acceptable. So, I'm wondering how the rumored 24-70/2 will look and feel alike. On another other side: The new Zeiss 55/1.4 otus is over 1000 grams, with no AF and no zoom and no possibility to re-adjust the lens' AF by a dock. I'm wondering about the pricing of that Sigma, it can't be much under it's competitors. After all, the lens performance still is more than those curves and I wait to see some sample pictures before judging anything, I know that's a bit old school. So far, Sigma surprised me twice with two lenses. Nikon needed 10 lenses to surprise me three times. It will become interesting if Sigma can hold on it's surprise rate ^_^ Leaked Sigma 24-105mm f/4 DG OS HSM - Klaus - 10-15-2013 Quote:Size/Weight comparison: The MTFs are not comparable. Leaked Sigma 24-105mm f/4 DG OS HSM - Brightcolours - 10-15-2013 The vignetting at wide angle will remain, because for most part that is sensor-caused. I already found the Canon one heavy for a standard zoom... Leaked Sigma 24-105mm f/4 DG OS HSM - frank - 10-15-2013 Quote:The MTFs are not comparable. Yes, I know. But I think the trend is comparable, e.g. borders vs center resolution/sharpness, astigmatism, etc. Even without knowing the specific definition of the manufacture's MTF, I think from the green lines in the Sigma chart it can be inferred that the astigmatism is quite pronounced at 24mm, at least wide open. |