[LRflex] Re: Bluedot Frustration...The solution... I think!

Philippe.  Perhaps the curve or distance of your rear element is different
than on the Leica lens.

 

I would think the curve and distance would need to be just right to get the
reflected light to focus enough on the sensor to show up.  Does the 80-200
have a fixed rear element, or one that does not move too much when focusing
or zooming?

 

Aram

 

From: leicareflex-bounce@xxxxxxxxxxxxx
[mailto:leicareflex-bounce@xxxxxxxxxxxxx] On Behalf Of David Young
Sent: Tuesday, January 29, 2008 5:43 PM
To: leicareflex@xxxxxxxxxxxxx
Subject: [LRflex] Re: Bluedot Frustration...The solution... I think!

 

At 29/01/2008, you wrote:



Aram,
A problem with THIS lens as David has tried other lenses and the bluedot
didn't show up so it can't be this sensor 
It is most certainly not the focal length - I own a 70-210 Angénieux and
never noticed it on a Digital camera . 
So it still may be this particular lens,  because it showed on the DMR AND
on the R30.
Or, more unlikely all 80/200, which Doug doesn't seem to have noticed so
far.

Bien amicalement
phx



Aram, Philippe:

Philippe has a good point.  The problem has occurred with this lens, when on
a D20, D30 and R8+DMR. 

It most likely affects all 80~200/4 Vario lenses, as it caused by the light
reflected from the sensor's surface (shinier than film) being re-reflected
back to the sensor by the rear element of the lens.  This will only happen
when circumstances are just right, and only with lenses with a rear element
of suitable curvature to allow it to happen.  Changing lenses, to one which
has a rear element of a different curve will cure the problem.

Cheers!

 

---

 

David Young,       

Logan Lake, CANADA 

 

Wildlife Photographs: HYPERLINK
"http://www.furnfeather.net/"http://www.furnfeather.net

Personal Web-pages: HYPERLINK
"http://www3.telus.net/~telyt"http://www3.telus.net/~telyt

Stock Photography at: HYPERLINK
"http://tinyurl.com/2amll4"http://tinyurl.com/2amll4 

 

No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.19.15/1249 - Release Date: 1/29/2008
9:51 AM


No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.516 / Virus Database: 269.19.15/1249 - Release Date: 1/29/2008
9:51 AM

Other related posts: