I first had a setup like yours, taking pictures along a ruler. And
yes, it was all macro with the 14-42/3.5-4.6 standard zoom lens which
was part of the E-400 kit.
Later I have learned that it was better to photograph plain newspaper
print from an angle which is about twenty degrees from horizontal. It
will give you a better feeling of the depth of field, which was my
primary concern when testing different lenses and macro converters.
BTW, my favorite macro converter is a lens which I unscrewed from an
Olympus slide copier (intended for copying slides or negatives to
digital). Its thread being 58mm it screws right onto my 14-42. Its
focal length is about 10cm.
Frank.
Sun, 21 Dec 2008 22:12:43 +0800, "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
wrote:
>BTW, I'm very interested on your setup, how can you measure the 1mm error at
>300mm distance? Were you using a macro?
>
>This is the best I can do (both use center focusing point):
>
>Normal AF
>
>http://www.accura.com.hk/temp/PC210741.jpg
>
>Imager AF
>
>http://www.accura.com.hk/temp/PC210742.jpg
>
>
>C.H.Ling
>
>----- Original Message -----
>From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
>
>> It is a rough figure but not far away, here is an example at 14mm setting,
>> the overall image may not be very sharp due to slow shutter speed but you
>> can see the focus is on the dish (or the drink) while it should be on the
>> face.
>>
>> http://www.accura.com.hk/temp/PC090020.jpg
>>
>> If focus shift is due to sensor positing error in the vertical plan (i.e.
>> just up/down or left/right) it is ok as the target will still be sharp. I
>> will not accept any focus shift which will cause image softness.
>>
>> C.H.Ling
>>
>>
>> ----- Original Message -----
>> From: "Frank van Lindert" <Frank@xxxxxxxxxxxxx>
>>
>>> CH, is it _really_ as bad as that, 2 ft instead of 3 ft, or are these
>>> figures just serving as an example of the phenomenon? If the figures
>>> are from real life, then I would return that E-520 immediately and
>>> not even bother having it repaired or consider to buy another.
>>>
>>> I own a E-400 and the focusing error is only 1 mm when the actual
>>> object distance is 300mm. Or to put it (roughly) in those terrible
>>> imperial measures, the error equals 1/32 inch at a 1 foot distance.
>>> Quite acceptable, I would say ;-)
>>>
>>> How much is the real error with your E-520?
>>>
>>> Frank van Lindert
>>> Utrecht NL.
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