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December 14, 2006
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ISO/Aperature Question

Thu Dec 14, 2006, 2:14 PM
  • Mood: Joy
  • Listening to: Nothing
  • Reading: Internets
  • Watching: Nothing
  • Playing: with my backup camera
  • Eating: Nothing
  • Drinking: Cop coffee


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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:iconurbanrural-photo:
~UrbanRural-Photo Dec 20, 2006  Hobbyist Photographer
Np
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:iconneurophonix:
~neurophonix Dec 14, 2006  Professional Photographer
so for your other camera it woud be like f8 at 15 at iso 50
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:iconurbanrural-photo:
~UrbanRural-Photo Dec 20, 2006  Hobbyist Photographer
Perfect spot on. That is the same thing I came up with last night.
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:iconesteficita:
Well, I would not be able to give you the proper figures. I just calculated it like this: If you stayed on an ISO 200 with an f/stop of 8.0 you would have to go down to a shutter speed of 10 secs, but since you are lowering the ISO to a 50 (which is really slow) you would actually be able to stay on something between a 20 and a 30 secs. I guess you just have to try it and see.
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:iconurbanrural-photo:
~UrbanRural-Photo Dec 20, 2006  Hobbyist Photographer
Took a bit but I got an answer of ISO 50 f/8 for 15 sec and I will post how I came to that answer.
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:iconesteficita:
Sorry, I forgot to add that you want to keep the f/stop as high(narrow) as possible for clarity and just adjust the exposure time then. So just go to the 8.
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:iconneurophonix:
~neurophonix Dec 14, 2006  Professional Photographer
sorry i meant open up. i think that would be like f11 at 3o sec. or f22 at 2 min
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:iconurbanrural-photo:
~UrbanRural-Photo Dec 20, 2006  Hobbyist Photographer
I look at all the post you sent and I guess I follow in your footsteps as I did the math on this.
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:iconneurophonix:
~neurophonix Dec 14, 2006  Professional Photographer
you would have to close down two stops or take the exposure for 2 minutes
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