Archived posting to the Leica Users Group, 2002/03/09
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> 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 - -- GMX - Die Kommunikationsplattform im Internet. http://www.gmx.net - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html