[Leica] "M" viewfinder correction lenses are available

[MGMcGough@aol.com]

   Unless you have a bad case of astigmatism, there is no point in 
   having an optometrist grind the lens from a standard large blank
   for you when ther are so many standard diopter lenses from other
   companies available in ( -4 to +4 ) strengths.  The astigmatism
   aspect is another problem altogether & only comes to bear when 
   switching from horizontal to vertical or visa-versa & can only be re-
   solved with a revolving ring.

   In my large collection of Leica parts that I mentioned in a prior 
   posting -  there is a screw-in device for a "M" Leica that will 
   accept the 18mm Nikon FM diopters which also came with the
   collection that I just acquired from the estate of a deceased 
   Leica camera repairman.  The diopters have a store sticker on
   them that is marked $12.50 and the single adapter that came
   with them was machined & sold by a man named Lee Beeder
   of Los Angeles.  It all seems fairly simple to me to have any
   old "M" ring threaded to take a non-Leica diopter at a fraction
   of the $80.00 Leica price.  

   Leically yours,

   MGM

In a message dated 1/7/00 4:50:01 PM Pacific Time, royzart@connix.com writes:
> 
>  Ah yes - the 042-253.008 (and that really is the part number). I had 
>  one once but could not locate locally anyone who could grind a 
>  lens small enough to fit that holder.
>  
>  When we discussed eyepieces for astigmatism correction a few 
>  years ago, Richard Clompus enlightened us on the process of 
>  fabricating and using a corrective lens.
>  
>  Roy
>