[Leica] IR/UV filter differences

[grduprey at mchsi.com (grduprey@mchsi.com)]

George,

I have the Heliopan UV/IR filter on my 28/2.8 Elmarit Asph, my onlly coded 
lens, and see no ill effects at all, no cyan creep at the edges, that I can 
tell.  I use my 2 free Leica filters on my 50 'cron and 35 'lux (pre-asph) 
neither have any coding and do not see any ill effects here either, although 
at these focal lengths I don't think it makes any difference.  My 90 
Tele-Elmarit uses the Heliopan filter, looks fine.  I think the problems are 
with the super wides, and not the 28 and longer lenses.  I know Len has done 
a more extensive testing, but my experience with my set of lenses, is all 
positive with either the Leica or Heliopan filters.  Cost wise, there is not 
a big enough difference to choose one over the other as they are all pretty 
pricey, expect $80 - $120 depending on size.

Gene

-------------- Original message from Lottermoser George <imagist3@mac.com>: 
-------------- 


> Thanks Len. Very informative. It would appear that the firmware is 
> truly set for Leica's filters then? 
> 
> Regards, 
> George Lottermoser 
> george@imagist.com 
> 
> 
> 
> On Sep 13, 2007, at 6:44 PM, Leonard Taupier wrote: 
> 
> > I've done extensive testing with Leica, B+W and Heliopan filters. 
> > The differences are most pronounced at the extreme wide angle 
> > lenses like 15, 16, 18 and 21mm. The B+W and Heliopans are stronger 
> > then the Leica's so the M8 under corrects for cyan creep. In the 
> > case of the 21mm a very slight correction in PS is OK. It's a lot 
> > more difficult with the ultra wides. 
> > At focal lengths above 21mm I don't see a difference. All my 
> > testing was with lenses that are 6 bit coded and from 16mm up to 
> > and including 35mm. My son did the same test with his CV15mm. 
> > I hope this helps. 
> 
> 
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