Wow that's a beautiful galaxy group with members of different morphologies.
I observed it twice this week. On the first evening it was a race against cirrus clouds that were moving towards the constellation of Leo. On the second evening conditions were better.
With my new 20" Dobsonian I tried to observe the dark lane in NGC 3190, but was unable to see it. On the first evening I saw a sharp edge on the SW side. But under better conditons I saw a diffuse continuation of the galaxy beyond that edge. I couldn't resolve a dark lane, though. Maybe it was a seeing issue?
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