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Tony is it an ED lens .
I think you would want a lens worthy of the cameras capability.
I have been looking for a Camera lens to use with a CCD astro camera as you know and found the Nikon 180mm f2.8 $700US and 300mm f4 $900US to be very popular lens for this task without selling the house and both have 1 or more Ed elements in the groupings to minimise Chromatic aberations.
Are there any with an ED lens that will suit the Canon mount?
You will pay more for an ED lens though.
I think as you have a $2500+ camera you would want the best lens posssible for it.With in reason.
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