

My D70s does a f/22 for 30 sec at an 200 ISO. What I want to do is the equivalent f/stop at an 50 ISO.
Here is why: My Coolpix 8700's (backup camera I call Holley LOL) smallest aperature is a f/8 which is 3 steps lower then a f/22, letting in 3 times more light and also is able to do a 50 ISO which is 4 time slow than the 200 ISO.
The Question: What is the equivalent f/stop on the Coolpix using the 50 ISO to the f/22 using 200 ISO?
Update on the D70s: I will be putting Tyra (yes I name my cameras) in the shop on Sat. I did not want to run the risk of damaging her further by again trying to clean up the mess I made. I found a great local repair shop that will charge me just under $50 buck to clean the whole camera.
So if anyone has a answer to my question let me know and how you came to that solution. I will search my books when I get home and if I find out I will post.
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