77mm ND2-ND32 (1-5 Stop) Variable ND Filter and CPL Circular Polarizing Filter 2 in 1 for Camera Lens No X Spot Weather Sealed Nano-Xcel

SKU: KF01.1087

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Hi, this ND filter has 5 stops from 1-5 , thanks. 
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The Olympus 100-400mm IS lens size is 72mm, please reconfirm the number mark as "ø" (diameter) symbol, if the number is 72, just need to order same 72mm size filter ,thanks. 
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Hi, in wide-angle lens if on the most darkness stop , suggesting focus length is 20-24 for avoiding vignetting. 
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50 mm Yongnuo lens filter size is 58mm, you can reconfirm your lens mark as "ø" (diameter) symbol, if the number is 58mm, it would be ok ,thanks. 
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Hi, if you want screw other filter or lens cap on this filter , need larger size than multifuctional filter , if you order 77mm ND2-ND32&CPL filter , the front of lens cap or filter need 86mm, of course you can use filter adapter rings , but too much filter added , it might be caused dark corner. 
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Yes, and another filter can be screwed on to it.