Here are some test images I have taken so far.
http://www.pbase.com/gregbradley/image/147225630/large TEC110
http://www.pbase.com/gregbradley/image/147235689 Nikon 24-70mm Variable ND filter some high thin cloud
http://www.pbase.com/gregbradley/image/147235699 Nikon 24-70 variable ND filter no cloud
The telescope ones are yellowish/orange and to me look fine but no surrounding environment. Would be good for Baileys beads, the diamond ring etc.
The lens ones I used a variable ND filter to be able to expose it. The last one is dead boring with a black background. The ones with the high thin cloud look nice to me. That's 70mm.
I am thinking after doing this test that I should cruise the net looking for examples of eclipse images I like and see what setup they used. Otherwise I can see that these filtered images could be very boring indeed.
Greg.