There is no B+W 103 MRC ND filter. The 103 does have a single layer coating, and optical performance is nearly as good as the multi-layer coaring (but lacks the scratch resistance). Higher density filters (106 and up) are uncoated.


I'd recommend getting the B+W 103 (0.9, 3 stops) and a Slim-mount CPL. Keep in mind that the CPL gives about 2 stops of light reduction (regardless of the orientation of the polarizer), so if you rotate it so there's no polarization, you effectively have a 2 stop ND filter (albeit an expensive one). To me, that makes theB+W 103 (0.6, 2 stops) a bit superfluous. Likewise, if needed you can stack the CPL on top of the ND for 5 stops total.


If you truly want 30+ second exposures in daylight, you'll want at least the B+W 110 (3.0, 10 stops) if not the 113 (4.0, 13 stops). Both of those also have a slight 'warming' effect (higher transmission in the red wavelengths).