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Author Topic: Center soft  (Read 1658 times)

snickgrr

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Center soft
« on: April 02, 2008, 06:47:59 PM »

Been struggling with focus on the Mamiya 645ll and Leaf A75.
On the attached shot outside the studio, I auto focused on the abandoned crane in the center.  F2.8.  The camera seems to want to focus in front but the reason I'm posting is the center of the lens appears to be the softest.  The 100% crops are 1. the center, 2. the ship on the left and way behind the crane, 3. the tour bus parking lot way in front and 4. the top of the crane.

Possible explanations?

Oh..no sharpening at all, through Raw Developer
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david o

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Center soft
« Reply #1 on: April 02, 2008, 10:36:12 PM »

hello,

wich lens I assume the 80mm but...

what your AF is set on? spot or large. I figured out that the large is useless when the spot is dead precise.
with the large AF you don't know wich part in it the focus will be on. It's suppose to be the closest part in that area...

some idea that may help you, at least it's a start...
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Bernd B.

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Center soft
« Reply #2 on: April 03, 2008, 06:35:59 AM »

Things like this happen.

On 16-9.net there is a test of the zeiss 17-35. An almost perfect lens, but there is a ring arround the center of the image, that is soft. Yes: the center is sharp, the corners are sharp, but somewhere in the field it is a bit soft.

While I can understand this with a complicated lens like a wide-angle-zoom lens I don´t know why it happens with a simple thing like the 80/2,8.

Maybe it is just an adjustment error of your particular lens?

Bernd




Quote
Been struggling with focus on the Mamiya 645ll and Leaf A75.
On the attached shot outside the studio, I auto focused on the abandoned crane in the center.  F2.8.  The camera seems to want to focus in front but the reason I'm posting is the center of the lens appears to be the softest.  The 100% crops are 1. the center, 2. the ship on the left and way behind the crane, 3. the tour bus parking lot way in front and 4. the top of the crane.

Possible explanations?

Oh..no sharpening at all, through Raw Developer
[a href=\"index.php?act=findpost&pid=186552\"][{POST_SNAPBACK}][/a]
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snickgrr

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Center soft
« Reply #3 on: April 03, 2008, 10:56:56 AM »

Thanks so far for the replies.
Yes, I forgot, it's the Mamiya 80mm.
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