what filter to buy ?

[vainqueur]

Best is quite subjective. Some folks hate the warm cast the ND110 gives. They chosed the big stopper instead. Though it gives a cool cast, is still more neutral compared the the ND110.

That's why have to do custom WB, have to play with kelvin, that's me at least.

If you see this shot I took last weekend, I have to set the kelvin to 5200k (I think) to prevent it from becoming over warm.

 

[vainqueur]

hey nice flickr series you have!
I was using Voig (50mm f1.1) in bright daylight, starting at f1.4 (because f1.1 is not sharp for this lens) to shoot my kids, i need to close the aperture to f4 to 5.6 to avoid overexposure, that means 4-5 stops, so what B&W for olympus 45mm f1.8 that fit this 4-5 stop you recommend??

Thanks man...

A CPL can bring down by at least 1 stop, not sure if it's useful enough for you, I got B+W CPL 52mm for $95, even more expensive than my ND110. In your case, not sure if its a good idea using square filter. My suggestion is you can borrow a CPL to see if that 1 stop is good enough for your or not. Then play around with your aperture and shutter to get the exposure you want.

If that 1 stop from the CPL is enough, basically you killed 2 birds with 1 stone, haha... You may already know this, but still want to remind you, shooting kids, you need fast shutter.