[GreenKeys] off-topic: advice on photography and camera lenses

[Bob McConnell]

gil smith wrote:
> Yes, I need to experiment a bit.  Good suggestion.  I am coming from a 
> camera where the whole body was blurred, so I wanted to stop the action 
> completely.  But I will try that.

Hi Gil,

You need to work out some basic math for your choices. One more F-stop 
will allow you to cut the effective film speed in half, or cut the 
exposure time in half. Cutting the exposure time in half requires twice 
the film speed. From there you can figure out what your optimum trade 
off is going to be. The price of the lens will probably define your 
upper limit, but at least you can work out the effective range of 
options you have to work with.

Bob McConnell
N2SPP