I only read the first several exchanges on this page which has to do
with trying to shoot a hawk using the 90-250 with 1.4 and 2X converters
attached. Where a detailed example is given the 90-250 has the 2X on it
for an effective focal length of 500mm and is wide open at an effective
aperture of f/5.6. Since this is a 4/3 body this is the magnification
equivalent of trying to use a 1000mm lens on a 35mm camera. This is
well within the range where atmospheric turbulence can start to take a
toll on image quality let alone that the lens is being shot wide open.
There may well be focusing errors involved but I think it will be pretty
difficult to prove it when the image quality is so hung out on a limb
with other complicating factors.
Chuck Norcutt
Johnny Johnson wrote:
> At 01:29 AM 1/15/2008, C.H.Ling wrote:
>
>> When playing with the camera I found some problem with AF. With DZ-50-200
>> at 50mm the lens always focus slightly in front no matter for close or long
>> distance subjects. It created slightly soft image while MF was very sharp.
>> Searching for the web, there seems to be some E-3 focusing shift issues but
>> nothing about DZ50-200, is it a known issue?
>
> You might go back and look at that thread on the 4/3s forum.
>
> <http://www.fourthirdsphoto.com/vbb/forumdisplay.php?f=12>
>
> It's growing daily and enough seemingly competent people are
> reporting problems that I wouldn't consider buying an E-3 until the
> dust settles. There are problems mentioned with the E-3 and 50-200
> but also with a number of other lenses.
>
> Later,
> Johnny
>
> __________________________
> Johnny Johnson
> Cleveland, GA
> mailto:jjohnso4@xxxxxxxxxx
>
>
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