#Sigma 20mm 1.4 astrophotography update#
#Sigma 20mm 1.4 astrophotography full#
#Sigma 20mm 1.4 astrophotography iso#

HereвЂ™s a crop of the top left corner of the test chart shot at F/1.4 with the Sigma 20mm F/1.4 Art Lens. Top-Left corner of the test chart to observe chromatic aberration and sharpness In the shot below you can see multiple frames in one frame.

#Sigma 20mm 1.4 astrophotography iso#

When I filmed my feet walking on grass I realized that thereвЂ™s some ghosting introduced at ISO 51,200. One thing I did notice about the Sony a7S II in lowlight is that thereвЂ™s apparently some kind of вЂњtrickвЂќ going on in extreme lowlight. IвЂ™ve heard otherwise, but personally I do recommend shooting lowlight in Slog2 as this for me is the perfect starting point for a balanced grade. I wanted to go for a low contrast look and IвЂ™m pretty happy with the result. I shot everything in the Slog2 Gamma and graded the film with a вЂњlowlightвЂќ LUT I created for this project, that retained most of the spectrum, lowered the dark areas and accented the highlights only slightl. In terms of exposure I tried to expose вЂњbrightвЂќ.В In lowlight it is important not to use the dark side of the spectrum too much, because this is where the noise is and it has to be cut off. I could not see what the camera saw, it was my вЂњnight vision deviceвЂќ and the sky was not (!) blue, as it appears to be in the video.Д¬oming back to the editing table I was veryВ happy to find out that the Sigma 20mm F/1.4 ArtВ Lens indeed performed very well at its lowestВ aperture.В I pushedВ the camera to 25,600 and 51,200 ISO max, as in my testsВ I felt those were the breaking points when it comes to noise for an HD result. I walked through forests, empty parking lots and ended up at a castle and many times the only light source was the moon. For me it was a pure enjoyment I can tell you, to realize that I needed to get far out of the city in order to push this camera/lens combination to its lowlight limits. You can observe the result in the video above which I hope you will enjoy. So there was no question when this lens arrived at our office I went out and shot the whole evening just with this lens and entirely at F/1.4. As we found out just recently, this new Sony mirrorless camera is even more powerful in lowlight than its predecessor, the original a7S. With the introduction of the new Sony a7S II, we can now shoot brilliant 4K video in extreme lowlight conditions.

#Sigma 20mm 1.4 astrophotography full#

A staple procedure for the Global Vision lines, every lens will be tested using the proprietary 'A1' measuring system.Right click, open this image in new window to see it in full 3840pixel resolution.

#Sigma 20mm 1.4 astrophotography update#

The Sigma 20 millimeter Art is compatible with the USB dock to update and customize and is also compatible with the Mount Conversion Service. As with all Global Vision lines, the 20 millimeter will be tested using the proprietary 'A1' measuring system ensuring the highest standard of operation. With class leading performance, this lens is ideal for landscape photography, videography, astrophotography, lowlight or indoor photography and event photography. The combination of advanced optics and optimized lens power distribution minimizes spherical aberration, axial chromatic aberration and field curvature, producing outstanding image quality. Through decades of experience in lens design and Sigma Global Vision lens manufacturing, the 20 millimeter incorporates both вЂњFвЂќ Low Dispersion (FLD) glass, and five Special Low Dispersion (SLD) glass in a design of 15 elements in 11 groups.

The latest optical design allows for the utmost in image quality with careful attention paid to edge to edge performance. Using over 50 years of lens making experience, particularly the knowledge gained from the 35 millimeter 1.4 Art and the 24 millimeter 1.4 Art, the 20 millimeter 1.4 Art is the widest large aperture Art lens to date. The Sigma 20 millimeter 1.4 DG HSM Art is a state of the art wide-angle prime lens designed for Full Frame cameras but will work with APS-C sensors as well.