Quote:
Originally Posted by Peter Ward
With camera lenses the aperture can be varied with a constant FL.
So a 'wide open' a lens is operating at its maximim aperture. Not surprisingly it gives its brightest image at this point....hence the amount of flux coming down the pipe, so to speak, is soley (give or take) determined by the aperture. Does that help?
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yes, that sort of makes sense to this lad. So, if I understand it all correctly, since the f stop on an astro setup is fixed and non changeable, then the amount of light coming through the aperture is fixed, only the exposure length and aperture width will affect the final exposure. Correct?
Dave