No K7 blob here.
MARK!
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message -----
From: "Steven Desjardins" <[email protected]>
Subject: Re: Latest Pentax Scare: Blobs on K-5 Sensor
I actually did this because I had a lens with a "blob" that I thought
was internal dust. (It was.) No K7 blob here.
On Mon, Dec 6, 2010 at 5:00 PM, Jack Davis <[email protected]> wrote:
Badly OOF?
Jack
--- On Mon, 12/6/10, P N Stenquist <[email protected]> wrote:
From: P N Stenquist <[email protected]>
Subject: Re: Latest Pentax Scare: Blobs on K-5 Sensor
To: "Pentax-Discuss Mail List" <[email protected]>
Date: Monday, December 6, 2010, 1:52 PM
On Dec 6, 2010, at 4:36 PM, Miserere wrote:
> On 6 December 2010 16:31, P N Stenquist <[email protected]>
wrote:
>>
>> On Dec 6, 2010, at 4:16 PM, Miserere wrote:
>>
>>> On 6 December 2010 16:03, paul stenquist
<[email protected]>
wrote:
>>>>
>>>> On Dec 6, 2010, at 3:33 PM, Charles
Robinson wrote:
>>>>
>>>>> On Dec 6, 2010, at 14:19, Miserere
wrote:
>>>>>
>>>>>> Any of you guys with a K-5
experiencing any of this?
>>>>>>
>>>>>> http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=37092371
>>>>>>
>>>>>> http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=37101106
>>>>>>
>>>>>> Maybe you K-7 owners could take a
look too. No need to transfer test
>>>>>> images to the computer, the blobs
can be seen on the LCD.
>>>>>>
>>>>>
>>>>> Frankly, if the images turn out OK
(besides being all green) then there is no problem.
Interesting as a curiosity, but not in a "OMG the sky is
falling" kind of way.
>>>>>
>>>>> Seriously... why would a person even
bother looking for something like this unless it's affecting
the output?
>>>>>
>>>>> And by "affect the output" I mean: can
this really be SEEN on something other than an f/22 shot of
a blank grey surface?
>>>>
>>>> It could be seen on any number of small
aperture shots. I'm definitely going to test for it.
>>>> Paul
>>>
>>> Thanks for the replies so far, and please keep
'em coming.
>>>
>>> My test unit has a string of blobs near the
center (most people seem
>>> to report them "near the center" for what it's
worth). They are
>>> noticeable at f/8 and smaller when
photographing a blank surface; I
>>> suspect in real photographs (with plenty of
detail) they should
>>> *maybe* be noticeable at f/11 and onwards. I
rarely photograph at such
>>> apertures, but I can imagine people shooting
landscapes would be
>>> annoyed to find these blobs in their blue
skies. Then again, a blob in
>>> a blue sky is easy to clone out. Then again,
again, we'd all prefer
>>> not to have to clone out blobs as part of our
postprocessing.
>>>
>>>
>>
>> I just tested my camera in the same manner as the
guy reported on dpreview. I filled my computer screen with
white and shot it with my DA* 16-50 at about 30mm, F stops
were f22, f16 and f11. Focus set to infinity. No blobs. Saw
a few specs of dust, Did the sensor clean operation and
retested, and the dust was gone. I get pure white.
>> Paul
>
> That's good news, Paul.
>
> For what it's worth, my blobs are much better defined
using the sky or
> a blank piece of paper than the computer screen. Not
sure why anyone
> would want advice on improving their blob definition,
but it's one of
> the many useful services I provide to the community.
>
> Because giving back is important.
>
I repeated the test with white paper. Still no blobs at
f22. Just out of focus paper.
Paul
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