I would suggest the CLS as the best real filter. My 1200D is unmodded ( I have a full spectrum 450D for clever pix ) and it more comes down to the processing to manage the LP red sky. Actually Photoshop2's auto effects seems to do a dang good starting cleanup for most situations.
The CLS will put a slight blue cast on everything but easy enough to balance the histogram and it means that you start with cleaner data without the overriding LP fog.
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