Sony Carl Zeiss 135 f/1.7 -- too sharp?

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Alan Browne - 14 Jul 2007 19:40 GMT

Wide open (f/1.7, 1/800, open shade, WB@7500K, from RAW, Maxxum 7D, ISO 100)

Unsharp maks... note the staircase in the middle, back petal. This is
apparent in the RAW file as well. See last linked image [W/O sharpening])

Downsampled
http://www.aliasimages.com/images/CZ135f1.7/OrangeFlowersPICT5234SML.jpg
201K

Full size
http://www.aliasimages.com/images/CZ135f1.7/OrangeFlowersPICT5234.jpg
761K

Section at full size
http://www.aliasimages.com/images/CZ135f1.7/OrangeFlowersPICT5234Sect.jpg
282K

and that's on a 6 Mpix camera. If Sony does a 12+ Mpix camera ...

(Note: focusing this thing is a challenge).

Is this lens *too* sharp for a 6 mpix?
http://www.aliasimages.com/images/CZ135f1.7/OrangeFlowersPICT5234Staircase.jpg

Cheers,
Alan.

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JimKramer - 14 Jul 2007 20:53 GMT

On Jul 14, 2:40 pm, Alan Browne <alan.bro...@FreelunchVideotron.ca>
wrote:

> Wide open (f/1.7, 1/800, open shade, WB@7500K, from RAW, Maxxum 7D, ISO 100)
>
[quoted text clipped - 24 lines]
> -- [SI] gallery & rulz:http://www.pbase.com/shootin
> -- e-meil: Remove FreeLunch.

The issue appears to be the angle (45 degrees) not the sharpness of
the lens. Get out some sharp edges and shoot them at various angles to
confirm.

JIm

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Alan Browne - 14 Jul 2007 23:17 GMT

> On Jul 14, 2:40 pm, Alan Browne <alan.bro...@FreelunchVideotron.ca>
> wrote:
[quoted text clipped - 20 lines]
> the lens. Get out some sharp edges and shoot them at various angles to
> confirm.

I've never seen this with another lens, including the razor sharp 100
f/2.8 ...

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Alan Browne - 15 Jul 2007 16:21 GMT

Didn't notice that the RAW import sharpening was on; I usually have it
at 0 to save sharpening for a last step before saving/printing.

So there is no -over sharp- issue ... how could there be?

Cheers,
Alan.

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Paul Furman - 16 Jul 2007 17:35 GMT

Links don't work...

> Wide open (f/1.7, 1/800, open shade, WB@7500K, from RAW, Maxxum 7D, ISO
> 100)
[quoted text clipped - 23 lines]
> Cheers,
> Alan.

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Alan Browne - 16 Jul 2007 18:33 GMT

> Links don't work...

Various reasons, anyway problem fixed ... sharpening in CS3 RAW import.
Turn it to "0" and the problem is solved. Image is this one:

http://www.photo.net/photodb/photo?photo_id=6195464&size=lg (which is
about 35% of the original shot).

http://www.photo.net/photodb/photo?photo_id=6198220&size=lg is a nicer
photo...

>> Wide open (f/1.7, 1/800, open shade, WB@7500K, from RAW, Maxxum 7D,
>> ISO 100)
[quoted text clipped - 24 lines]
>> Cheers,
>> Alan.

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