Hugo Lopes wrote:
>
> I know this was previously discussed but, I came across an "F-stops
> Incremental Chart" taken from the "Nikon School Handbook" and found out
> that an +1/2 stop increment over f1.4 is f1.7 and not f1.8! Beeing an
> EOS "1/2 stop cameras" owner all my life (I moved to the EOS 3 recently)
> it came as a shock to me, to find out that my beloved EOS 1000FN, 600
> and 5 were displaying an +2/3 stop increment over f1.4and not an 1/2
> stop (neither does my EOS 3 in 1/2 stop increments mode, for the
> matter)! To make things more confusing, they show +1/3 stop over f4.0
> and so on. They almost never display the true 1/2 stops. I'm I missing
> something here? If there is an answer to this question in the list
> archives, please kindly tell the approximate date when this was
> discussed and I'll go search for it. If not, can someone explain this?
Yes, it has been discussed not so long ago. While there is no proof or
confirmation from Canon, it seems reasonable that they (Canon) do it in order
to be able to show the max aperture of all their lenses on all cameras.
Otherwise, your 1000FN would have to show f/2 with the 50/1.8, not a good
ad for Canon ;-) The "wrong" values also seem to coincide with max apertures
of EOS lenses (1.8, 3.5, 4.5)
Thomas Bantel
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