Newby Question about f-stop & ISO

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Aaron64FTy New Member • Posts: 2
Newby Question about f-stop & ISO

I have a f2.8 lens and I am trying to simulate how much light would be let in for a f1.8 lens I am considering buying so I can make a decision on how much ND I will need to buy for my desired shutter speed.

My question is how do I simulate this?  Can I just bump my ISO up from 100 to 400 when in f2.8 to simulate the amount of light the f1.8 lens would let in at 100 ISO?

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