Tony,
Lovely puc mate
I too find Markarian's Chain fascinating. BIG/long chain. Visually something special too as the chain is within range of smaller apertures too. In big apertures, Oh Lordy! soooo many blooming galaxies litter the fiueld of view it's almost difficult to trace the chain.
I too have it on my to do list. Not with photography but sketching. Big A3 sheet and my 17.5" scope. Pieces of this size actually require a bit of planning. And that's half the fun too
Alex.