Re: [OM] 300/4.5

[Clyde Soles]

Slightly off topic...Are the 250 and 350 really the exact same 
diameter and weight as the handbook and SIF claim?
btw there's a black 350 on ebay now...somebody could have a *very* 
merry Christmas!
> Here is how the glass of the 350/2.8 is described:
>
> "The provision of two lens elements of special low dispersion glass, 
> and another
> of extraordinary partial dispersion glass successfully cuts 
> chromatic aberrations
> to virtual insignificant proportions."
>
> Special Low Dispersion - SD, and again, Extraordinary Partial Dispersion.
>
> The 250/2:
>
> "Chromatic aberrations are completely corrected by the use of special low
> dispersion glass, and extraordinary partial dispersion glass for 
> each of the four
> front elements."
There's a bit more glass discussion in the glossary too but it 
doesn't add much to the conversation except lumping all the exotics 
under "ultra low dispersion glass."

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