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Re: [Rollei] Rollei 2.8D with Problems



Thanks for the advice Richard.
Maybe I should just it to you instead.   :-)
Regards,
David.


- ----- Original Message ----- 
From: "Richard Knoppow" <dickburk  >
To: <rollei  
Sent: Wednesday, April 02, 2003 8:44 AM
Subject: Re: [Rollei] Rollei 2.8D with Problems


> 
> ----- Original Message -----
> From: "David Grasby" <david.grasby  >
> To: <rollei  
> Sent: Tuesday, April 01, 2003 2:22 PM
> Subject: [Rollei] Rollei 2.8D with Problems
> 
> 
> > Dear Fellow Rollei Users,
> >
> > I have a 2.8D with a 80mm f2.8 Xenotar lens. The camera is
> in lovely
> > condition, but the lens has 'haze' problems.
> >
> > I sent the camera to a techie but he only works on bodies
> and couldn't cure
> > the haze problem but he did loosen the front element so
> that I could send it
> > away for repolishing.
> >
> > Now, I removed the front element and the haze is not on
> either the front or
> > rear of the lens, but in the middle. I know precious
> little about lenses,
> > but I assume the front element of the Xenotar is a
> doublet(?). Does anyone
> > on the list have any idea about what could be causing the
> haze and whether
> > it is possible for it to be repolished? Is this likely to
> cost more than the
> > camera is worth (I paid $300AUS ($180US) for the camera)?
> > Cheers,
> > David.
> >
> 
> 
>    I think you mean front _cell_ not element. The front cell
> has two lenses in it. The front lens is a single element the
> rear lens is a cemented pair of elements. Most likely the
> haze is on the glass-air surfaces inside the cell. The front
> element can be removed by unscrewing the retaining ring at
> the front of the cell. Schneider retaining rings have slots
> for a special tool to remove them. They can also be removed
> by using a friction tool made of a tube the right diameter
> with a sticky rubber ring cemented to one end.
>   You can make a suitable spanner from sheet metal, that's
> preferable to using an adjustable spanner since it is much
> less likely to slip and scratch the lens surface.
>   The haze will clean off with lens cleaner or window
> cleaner.
>   The rear cell also has two air-spaced elements in it and
> is also probably hazy.
>   It is possible, but much less likely, that the haze is
> from defective cement between the two elements of the rear
> lens in the front. A flashlight shown into the lens will
> generally help to distinguish between haze and bad cement.
>   I don't know the exact source of the haze. Its very common
> in older lenses. I suspect it comes from evaporation of
> something from the anti-reflection paint inside the cell.
>   If you decide to disassemble the cell pay attention to any
> spacers which may be under the element. I don't think
> Schneider uses these on Xenotars but they do on other
> lenses. They must be replaced in the right place and with
> the correrct orientation.
> 
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk  
> 
> 

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