Archived posting to the Leica Users Group, 2002/03/09

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Subject: Re: [Leica] Re: viso III brightscreen replacement
From: Dr.Alexander.Kraus@gmx.de
Date: Sun, 10 Mar 2002 01:53:47 +0100 (MET)
References: <3507.1015667913@www36.gmx.net>

> Hello Rei,
> 
> I recently modified my Visoflex III. It is now as bright as my Leica R5!
> First I replaced the ground glass (yes, its really glass) by an original
> Leica R ground glass.
> In order to do so, I had to cut of the "holding nipple". That was no
> problem
> since the screen consists of plastic. 
> There are no shim rings to worry about. Just make sure that the grounded
> surface faces down and the fresnell lens surface faces up (be careful not
> to
> scratch the surfaces).
> If you now look through the pentaprism finder or the vertical loupe, you
> will recongnize that the image has already become much brighter in the
> center,
> but that there is a significant falloff in brightness towards the edges.
> This
> is caused by the fresnell lens. The original ground glass doesn't have an
> integrated fresnell lens. Here, an even illumination is achieved by a
> biconvex
> lens in the pentaprism or vertical loupe finders.
> The introduction of the fresnell lens in addition to the light collecting
> lens results in a overcompensation.  Thus, it is necessary to remove the
> biconvex lens. This is really easy done, since the lens is easy
> accessible. Its the
> one that faces down (directly above the ground glass).  You just have to
> remove the chrome bottom plate of the finder. Than you can now take the
> lens out
> and put the chrome plate back where it was. That is all!
> You will be amazed how bright your Visoflex will be - its a whole new
> experience! :-)
> The good thing is that you can restore the visoflex to its original state
> any time (in case you want to sell it).
> Have fun :-)
> Regards from Germany,
> Alex

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In reply to: Message from Dr.Alexander.Kraus@gmx.de (Re: [Leica] Re: viso III brightscreen replacement)