yes i find this very confusing too ken
for instance i have the 60da, my brother has modded a 350, 450 and a 60d by purchasing whatever filter and removing one, the results are no where near the same as my 60da
he also recently acquired a "full spectrum IR" modded 5d which he wanted to try out for astro, but the jury is still out on that one, it gave a funny rendition of the LMC
pat
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