What caused this to my images

Archived from groups: rec.photo.digital (More info?)

That's not the lens hood ... it's something else, such as a hand or piece
of clothing.

If it was the lens hood, your picture would have the corners "clipped" or
darkened.





"Russell" <me@me.com> wrote in message
news:3u1kr0111s2r8svunqtrla9b8o6q09o3ei@4ax.com...
> I have just purchased a Panasonic FZ20 which arrived just in time for
> a hike along the coast. I took most of the pictures with the lens hood
> fitted and noticed that on some pictures the edge of the hood appears
> to intrude into some of the pictures (see link).
>
>
http://myalbum.mweb.co.za/uploaded [...] 91f55a/raw
/9a5de67a723b4f0e849b43ddb0ebab72_cliffs.jpg
>
> This did not happen consistently and from what I can see only seemed
> to happen occasionaly when the lens was at it's widest angle. My
> theory is that is was caused by the optical image stabiliser when the
> lens hood moved into the line of view of the lens while the lens was
> kept steady when taking the shot. Anybody have any ideas of similar
> experiences?
>
> Thanks in advance
> Russell

Archived from groups: rec.photo.digital (More info?)

Russell <me@me.com> writes:

> This did not happen consistently and from what I can see only seemed
> to happen occasionaly when the lens was at it's widest angle. My
> theory is that is was caused by the optical image stabiliser when the
> lens hood moved into the line of view of the lens while the lens was
> kept steady when taking the shot. Anybody have any ideas of similar
> experiences?

I've seen lots of photos with lens hoods or filter rings in them, and
generally when the lens was wide-angle. Your photo, however, is very unlike
those photos. I haven't seen your lens hood. _Generally_ a lens hood causes
shading in all four corners of the image. The shadow is rounded (as is the
lens hood). This is called vignetting. There are two samples of vignetting
at
http://www.vanwalree.com/optics/vignetting.html
one at the top of the page, and another, more severe, example near the
bottom.

Your shadow is a straight line along one edge of the image. That is
unlikely to be caused by a lens hood, unless you have one that is
rectangular and fits on the lens with a bellows. See
http://www.adorama.com/images/Product/US_MMXBLH.JPG
for an example photo of such a hood.

If your hood is round, I doubt that is the source of the shadow.
--
Phil Stripling | email to the replyto address is presumed
The Civilized Explorer | spam and read later. email from this URL
http://www.cieux.com/ | http://www.civex.com/ is read daily.

Archived from groups: rec.photo.digital (More info?)

Hi all, thanks for the replies

Here are some other images with this problem :

On the left edge :
http://myalbum.mweb.co.za/uploaded [...] d_err2.jpg
http://myalbum.mweb.co.za/uploaded [...] 4_err3.jpg

On the right edge
http://myalbum.mweb.co.za/uploaded [...] e_err4.jpg

On the top edge (camera held sideways)
http://myalbum.mweb.co.za/uploaded [...] 7_err5.jpg

As mentioned, the camera has a large hood with is not round. see :
http://www.dcresource.com/reviews/ [...] s-hood.jpg

One thing is that the manual suggests that the hood is not mounted as
show in the image above, but rather rotated at 90 degrees to the one
shown in this image. In other words so that the large edges protrude
at the sides rather than at the top as shown in the image.

The reason I suspect it is the lens hood causing my problems is
because of it's irregular shape, but that's just my guess

Archived from groups: rec.photo.digital (More info?)

Ok, just figured out the problem after some experimenting. It is the
lens hood which, after re-reading the manual, I see that I've rotated
to the wrong position. When all else fails read the instructions ...

My apologies for wasting everyones time and thanks for the responses.

Cheers,
Russell.

Archived from groups: rec.photo.digital (More info?)

In article <3qacslg87n.fsf@shell4.tdl.com>, phil_stripling@cieux.zzn.com
says...
> Russell <me@me.com> writes:
>
> > This did not happen consistently and from what I can see only seemed
> > to happen occasionaly when the lens was at it's widest angle. My
> > theory is that is was caused by the optical image stabiliser when the
> > lens hood moved into the line of view of the lens while the lens was
> > kept steady when taking the shot. Anybody have any ideas of similar
> > experiences?
>
> I've seen lots of photos with lens hoods or filter rings in them, and
> generally when the lens was wide-angle. Your photo, however, is very unlike
> those photos. I haven't seen your lens hood. _Generally_ a lens hood causes
> shading in all four corners of the image. The shadow is rounded (as is the
> lens hood). This is called vignetting. There are two samples of vignetting
> at
> http://www.vanwalree.com/optics/vignetting.html
> one at the top of the page, and another, more severe, example near the
> bottom.
>
> Your shadow is a straight line along one edge of the image. That is
> unlikely to be caused by a lens hood, unless you have one that is
> rectangular and fits on the lens with a bellows. See
> http://www.adorama.com/images/Product/US_MMXBLH.JPG
> for an example photo of such a hood.
>
> If your hood is round, I doubt that is the source of the shadow.
>
I can get this effect with my Sony 717 or my Sony 828 if I accidently rotate
the lens hood about 1/8 turn (petalled lens hoods).

Not being familiar with your cameras lens hood I would ask if it is the
"Petteled" type.. if it is, make sure the larger pettals are squarely top and
bottom and not partially rotated.


--
Larry Lynch
Mystic, Ct.

Archived from groups: rec.photo.digital (More info?)

In article <MPG.1c23e7bd95fcbb34989866@news.comcast.giganews.com>,
lastingimagery@comcast.dotnet says...
>
>In article <3qacslg87n.fsf@shell4.tdl.com>, phil_stripling@cieux.zzn.com
>says...
>> Russell <me@me.com> writes:
>>
>> > This did not happen consistently and from what I can see only seemed
>> > to happen occasionaly when the lens was at it's widest angle. My
>> > theory is that is was caused by the optical image stabiliser when the
>> > lens hood moved into the line of view of the lens while the lens was
>> > kept steady when taking the shot. Anybody have any ideas of similar
>> > experiences?
>>
>> I've seen lots of photos with lens hoods or filter rings in them, and
>> generally when the lens was wide-angle. Your photo, however, is very unlike
>> those photos. I haven't seen your lens hood. _Generally_ a lens hood causes
>> shading in all four corners of the image. The shadow is rounded (as is the
>> lens hood). This is called vignetting. There are two samples of vignetting
>> at
>> http://www.vanwalree.com/optics/vignetting.html
>> one at the top of the page, and another, more severe, example near the
>> bottom.
>>
>> Your shadow is a straight line along one edge of the image. That is
>> unlikely to be caused by a lens hood, unless you have one that is
>> rectangular and fits on the lens with a bellows. See
>> http://www.adorama.com/images/Product/US_MMXBLH.JPG
>> for an example photo of such a hood.
>>
>> If your hood is round, I doubt that is the source of the shadow.
>>
>I can get this effect with my Sony 717 or my Sony 828 if I accidently rotate
>the lens hood about 1/8 turn (petalled lens hoods).
>
>Not being familiar with your cameras lens hood I would ask if it is the
>"Petteled" type.. if it is, make sure the larger pettals are squarely top and
>bottom and not partially rotated.
>
>
>--
>Larry Lynch
>Mystic, Ct.

And as an aside, make sure that the wind is not collapsing it on one side if
it's at all flexible.

Hunt

Archived from groups: rec.photo.digital (More info?)

On Fri, 10 Dec 2004 22:33:16 +0200, Russell <me@me.com> wrote:

>I have just purchased a Panasonic FZ20 which arrived just in time for
>a hike along the coast. I took most of the pictures with the lens hood
>fitted and noticed that on some pictures the edge of the hood appears
>to intrude into some of the pictures (see link).
>
>http://myalbum.mweb.co.za/uploaded/7ede5f6c-306a-11d4-b417-0008c791f55a/raw/9a5de67a723b4f0e849b43ddb0ebab72_cliffs.jpg
>
>This did not happen consistently and from what I can see only seemed
>to happen occasionaly when the lens was at it's widest angle. My
>theory is that is was caused by the optical image stabiliser when the
>lens hood moved into the line of view of the lens while the lens was
>kept steady when taking the shot. Anybody have any ideas of similar
>experiences?
>
>Thanks in advance
>Russell
That happens to me with the Nikon D70 and 18-70mm lens at widest
angle, when the lens hood is not seated properly. The hood doesn't
'click' into place and can unscrew just a tiny bit with handling, to
cause severe irregular vignetting.

Does your lens hood have the same design flaw perhaps?

Archived from groups: rec.photo.digital (More info?)

Mark² wrote:

> ...
> http://myalbum.mweb.co.za/uploaded [...] cliffs.jpg
> ...
>
> All I have to say is...kudos to the pilot who managed to
> draw such a perfect red-smoke question mark in the sky!!
>
> Not sure why he drew the other squiggly line though...

The pilot probably knew the entire UFO wouldn't fit in a frame...