Quote from: Frodo link=topic=19640.msg370447#msg370447 dateHowever, coma is an issue. I took a milky way shot and coma from city lights at the bottom edge (portrait format) was very noticeable.Is it possible for you to post this picture? I took a look at lenstip.com but I'm interested in a real life example of this coma issue at F2.0. That would really help in the decision I want to make.
Here you are. I took this quickly off a table top tripod. Details 5DmkII, 35mmf/2IS, 15 sec @ f2, ISO 1600. The max aperture of f/2 allowed me to shoot at 15 seconds avoiding star trails. However, you can see the coma in the lights on the bottom left and stars in the top. Stars are sharp and coma free in the centre of the photo.