[Leica] Filter for the M8 B+W 486

[henningw at archiphoto.com (Henning Wulff)]

At 5:19 PM -0800 12/21/06, Frank Filippone wrote:
>I tend to agree.... If Brand N or C can do the coatings, Leica 
>could.  It is not impossible....  The SLR retrofocus lenses do allow
>the light rays to attack the sensor plate at a more perpendicular 
>angle than say the 21 SA.... But I am not sure that even the
>angles the Leica lenses would make would affect the outcome....These 
>coatings are angstroms thick, and even at an angle, they would
>not change significantly in thickness ( in % it appears a lot, but 
>you must think in terms of absolute thickness and the effect of
>that extra thickness..)

A fairly small change in the angle of incidence can negate the effect 
of an interference filter. I don't want to do the calculation right 
now, but I wouldn't be surprised if the differences in the Leica M 
and DSLR incidence angles are enough to greatly influence the outcome.

Hot filters in front of the lens would have a similar problem, though.

>Leica has taken a different path, and it failed.  Rather than 
>admitting the error and fixing the problem correctly, they get all 
>the
>M8 customers to buy filters to fix a problem in design.  Nice trick 
>if you get away with it.....more profit from a problem solution!
>
>I think the issue is the loss of the sensor, cost of putting in a 
>new one, and a new sensor... All at Leica's expense.  I sure would
>not WANT to do it, but it would be good customer service....
>
>I think the Solms elves forget that a LOT of their customer base are 
>people of means and influence.  Many have owned or own their
>own companies, and do not like being given second fiddle......  If 
>these customers found out Leica was acting on the cheap, they
>would raise a real stink with management.....
>
>So bottom line, I think the issue is to put the filter coatings on 
>the sensor glass..... but apparently all those on this list that
>have spent $5K to buy a camera with a more than minor problem, do 
>not agree... they seem happy with the filter solution.....
>
>Or are they?
>
>Frank Filippone
>red735i@earthlink.net
>
>
>-----Original Message-----
>From: lug-bounces+red735i=earthlink.net@leica-users.org 
>[mailto:lug-bounces+red735i=earthlink.net@leica-users.org] On Behalf 
>Of Mike
>Durling
>Sent: Thursday, December 21, 2006 3:36 PM
>To: Leica Users Group
>Subject: Re: [Leica] Filter for the M8 B+W 486
>
>I suspect that the reflection may not be that much of a problem because
>other manufacturers seem to be using these coatings.  The problem with
>the oblique light rays passing through the coatings may be valid since
>Leica lenses are different in this regard, or are at least
>non-retrofocus design for the most part.
>
>I am also guessing that they aren't fixing this problem on the already
>manufactured cameras because it is necessary to apply this coating at
>the factory and might require a difficult dismantling of the sensor
>block to retrofit it, or a replacement.
>
>Guesses all.
>
>Mike D
>
>
>_______________________________________________
>Leica Users Group.
>See http://leica-users.org/mailman/listinfo/lug for more information
>
>
>
>_______________________________________________
>Leica Users Group.
>See http://leica-users.org/mailman/listinfo/lug for more information


-- 
    *            Henning J. Wulff
   /|\      Wulff Photography & Design
  /###\   mailto:henningw@archiphoto.com
  |[ ]|     http://www.archiphoto.com