>
>> I repeated the results with the aeIII primism which displays
>> the shutter speed in half stops and got very simular results
>> - bearing in mind the lower measurement accuracy. Certainly
>> there is no indication of a decrease in shutter speed with
>> the aeIII when I compare infitnity on the zoom at 220mm and
>> 1m on the zoom @220mm focal length and acording to the maths
>> there should be half a stop loss.
>>
>
>
> An interesting experiment to try:
>
> a. Measure the exposure for an evenly lit wall 10m away from the camera
> with
> the lens focussed at 10m.
> b. Measure the exposure with the lens focussed to 1m without moving the
> camera relative to the wall.
> c. Measure the exposure with the lens focussed to 1m moving the camera so
> that it's 1m from the wall.
>
> Compare the measurements in a, b & c.
>
ok will do
My *guess* is for everything except the zoom
b will be down around 1/6 to half a stop on a depending upon the lens
b and c should be the same
James
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