Quote:
Originally Posted by RB
Do yourself a favour Ian and go for either a Canon 70-200mm f4 or if you need the extra stop save up for the f2.8.
Later get yourself a 1.4 TC and you'll have a great combo for both terrestrial and astro.
You should be able to find great deals on the Canon 70-200mm.
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I can only agree!
...another thing to consider is the size/weight of the lens if it is likely to be piggybacked.
I use mine mounted on a side by side plate, so the small footprint of the 70-200mm lens works well.