The Canon 200mm lens in the south dome

I have now removed the Canon 5D MkII from the 200mm lens in the south dome and replaced it with the M25C that used to be on the Hyperstar.

The massive field of view afforded by the 5D MkII on the 200mm lens is truly addictive – but the lack of red sensitivity of an un-modified DSLR and the lack of Peltier cooling drove me to put the M25C back on.

So – a whole Cassiopeia mosaic instead of being a 4-framer with the 5D MkII is now a 6-framer, or very comfortable 9-framer.  The price you pay I guess.


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