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Old Sep 19, 2003, 6:18 PM   #1
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Posts: 294
Default Simple /fstop question

Ok,

My question is this:

If I have a lens (ie: Sigma 70-200mm f/2.8 ) and I throw
a teleconverter on it of 2x (Which people say makes it jump around 2 fstops). What are the fstop jumps? And is there any between this?

f/2.8
f/4.0
f/4.5
f/5.6
f/6.3
f/8.0
f/11.0
etc

So would my lens turn into an fstop of f/4.5? Or higher? Lower? Help me...
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Old Sep 19, 2003, 10:15 PM   #2
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Join Date: Oct 2002
Posts: 579
Default Re: Simple /fstop question

Quote:
Originally Posted by UniSonBBS
If I have a lens (ie: Sigma 70-200mm f/2.8 ) and I throw a teleconverter on it of 2x (Which people say makes it jump around 2 fstops). What are the fstop jumps? And is there any between this?

f/2.8
f/4.0
f/4.5
f/5.6
f/6.3
f/8.0
f/11.0
etc

So would my lens turn into an fstop of f/4.5? Or higher? Lower?
In the above list, F2.8 has the largest aperture (i.e. opening that allows light to pass through) and F11.0 has the smallest. A typical list, from large to small, is ..., F1.4, F2.0, F2.8, F4.0, F5.6, F8, F11, F16, F22, ...... If a 2X converter is added, it reduces the light intensity by 2 stops. Therefore, if the apertures being used is F2.8 and F8, the new apertures will be F5.6 and F16, respectively. The "Exposure Overview" page in the "Exposure Modes" section of my Coolpix 4500 user guide has more details.

CK
http://www.cs.mtu.edu/~shene/DigiCam
Nikon Coolpix 950/990/995/2500/4500 User Guide
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