25mm F2.8 ZM not good for long exposure?
I wanted to ask around if anyone has experience with the Zeiss 25mm 2.8 ZM lens for long exposures, star trails, Milky Way shots? This past September, i was in main for the star festival. I started using my Leica 35 1.4 and getting amazing results. Then I used my 90 2.8 and got great results. However, when i needed a bit wider fov, i put on the 25 zm. I adjusted my setting and shot away. When i started looking over my photos on the computer, all of the zeiss shots where dark, no details...nothing. Any ideas?
PS. I've used the 25mm for day shots or shots out with friends in a dark restaurants and the results are usually great.