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Nice image. I had a look into this a while back, and it seems that there's a lot of emission that isn't just H-alpha from the Tarantula (and others in the LMC, and NGC346 in the SMC. I think there's a lot of OIII (I dug out an old research paper on it once, no idea where now), but it means that with an unmodded camera the blues and greens quickly dominate the image (as you only have about 20-30% H-alpha transmission). I'd guess that in an un-modded camera, the loss of H-alpha red along with more H-beta and OIII together, make it bluish?
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