It seems that a red filter can indeed help. Some say deep orange helps too because red is too dark.
http://www.cloudynights.com/topic/47...th-red-filter/
I guess if used with the NexImage and iCap I could play around with the settings, so red (as also recommended in the article we discussed yesterday) would also be fine and not too dark.
The OP in the thread above even says that the view was improved "significantly" with a red filter.