Okay, here is the partial responses to the problem you mentioned. For the
28-48 I notice similar problem as you, on the wide end the aperture is much
larger then the long end, I haven't check how many stops different, just
don't use external meter that would be fine.
For the 50/1.4 I didn't notice any over exposure for slides shot, but if you
are talking about 1/3 stop, I think I will not notice this small different
without side to side comparison.
C.H.Ling
----- Original Message -----
From: "Ángel Lobo" <angel.lobo@xxxxxxxxxx>
> Hello all.
>
> After some tests with two items of this little zoom 28-48 f 4 I can say:
>
> 1.- The zoom 28-48 underexp. 1/3 on 35 mm vs 35 f 2 or 35 f 2..8.
>
> 2.- The zoom 28-48 underexp. 1/2 stop on 28mm vs 28 f2, 28 f2.8 or 28
f3.5.
>
> 3.- The zoom 28-48 read the same light on 48mm than 50 f1.8 .
>
> Reading the light over the same scene one Zuiko 35 mm read an amount of
> light and this zoom 28-48 on 35mm setting read 1/3 more of light, when I
> adjust for the correct exposure on the zoom shoot, I´m taking one picture
> underexposed 1/3 (more dark).
>
> I have this suspicion long time ago and after test two of this little zoom
> side by side I can say that both zooms do the same way , and I guess this
> is a problem worse than a zoom engraved f4 and working as a zoom f 4.5.
The
> big problem is that the zoom is not a real zoom with automatic diaphragm,
> giving underexposed pictures.
>
> I thing is very rare nobody on the Oly List (where are some very good
> friends of this little zoom) say never somethig concerning this matter.
>
>
> On the same chapter of problems, testing my 4 lenses 50 mm 1.4 vs my 4
> lenses 50 1.8 I can say that "ALL" my four different lenses 1.4
overexposes
> 1/3 vs "ALL" my four different lenses 1.8. ( And versus some other Zuiko
> lenses as the zooms 35-70). Maybe this is my reason for write some times
on
> the list that I prefer some lenses 50 1.8 than the lenses 1.4. I can see
on
> the pictures taked with the 1.4 lenses (usually the more moderns MC items)
> a plus of light that I interpret as a bad look of the pictures.
>
> One more time, my surprise is that all the four lenses 1.4 ( SC Chrome, SC
> Black, MC<1mill. and MC>1mill) give the same reading of light and that
> nobody -neither- say something concerning this matter on the List.
>
>
> Ángel Lobo.
> CUENCA ( Spain ).
>
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>
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