PS> 300mm lens ever made). The 20/2.8 and 85/1.8 use the same lens formulas as PS> Pentax. The 20mm and 35mm CZJ primes focus remarkably close, typically Hi Paul, I have to correct one myth. I looked, and both the 20mm Flektogon and the 85mm Planar don't have that much common in formula with Pentax offerings. They are both different formula. There is no connection! The similarity is even less than with common 50mm double-gauss designs.
Compare for yourself: http://kmp.bdimitrov.de/lenses/primes/ultra-wide/index.html http://www.praktica-users.com/lens/mlenses/czjflek28_20.html It may be even that it was actually me who told you so about the 1.8/85 and 1.8/80. Here, you see how myths work and spread ;-) From my own example, I now do not believe ANYTHING I read about a lens on the internet...;-) I also believe that Cosina/Voigtländer does indeed make their new primes for M42 mount. After all, year ago or so they released a whole new M42 mount SLR! I think these primes would be the better buy than for example an old CZJ lens from ebay. Unless you can test the lens yourself, it can be dubious especially if you have high expectations because of rumours and myths. Good light! fra
