This topic is in the 2018 archive. You can read it and like its posts here. It is read only.
Archive 2018Milvus 25 1.4 coma (on A7RII)
p.1 #1Milvus 25 1.4 coma (on A7RII)
Here is a quick coma test at 100% for Milvus 25 F/1.4 .zf2, adapted on Sony A7RII using a non-electronic adapter. The main star shown is the brightest one I could see in the sky, and was placed in the far right corner of the frame. Focus was set at F/2.8 for which coma was not distracting. No focus adjustments made for each aperture. ISO 640, 5sec exposure. No post processing except minimal sharpening (camera raw default) and "remove CA" checked in camera raw (as the lack of electronic adapter precludes in camera CA correction via a lens profile).
F/2.8 looks really good to me, and F/3.2 superb. At F/2.8 and smaller there is almost no color fringing which is very impressive. I wil probably only use F/1.4 as a composition aid for astro work with this lens.
F1.4
F2
F2.8
F3.2
F/2.8 looks really good to me, and F/3.2 superb. At F/2.8 and smaller there is almost no color fringing which is very impressive. I wil probably only use F/1.4 as a composition aid for astro work with this lens.
F1.4
F2
F2.8
F3.2
Mar 31, 2018 at 05:31 AM
p.1 #2Milvus 25 1.4 coma (on A7RII)
Thanks for posting this.
I agree - it's a great lens, and coma correction by f/2.8 for an f/1.4 lens that's such a high performer in almost all other respects is remarkable.
I agree - it's a great lens, and coma correction by f/2.8 for an f/1.4 lens that's such a high performer in almost all other respects is remarkable.
Apr 06, 2018 at 12:44 PM