Re: [OM] 35-70 F/3.5-4.5 formula

[PCACala]

Hi Foxcroft:

<< When was the f3.5-4.5 released? I've never heard of this lens. And why did
 Olympus release a f4 and f3.6 version of the same zoom length? >>

As per:
http://www.astro.wellesley.edu/lhawkins/photo/multicoat.txt
this would be late 1985.

I recall the F/4.0 vs F/3.6 was in keeping with the marketing practice of
offering a faster pro level (Zuiko) lens matched with a slower but higher
cost/performance ratio  (S Zuiko) lens.  The OM System Lens Handbook also
emphasizes that microprism focusing is aided by the F/3.6 aperature.  While it
would have made sense to go faster remember that in those days fast zooms were
optical compromises and highly expensive.  At least Oly gave their engineers a
chance at glory with the eventual F/2.8  I assume that previous discussions
have praised that glass?

Gary Reese
Las Vegas, NV

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