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Re: [OM] Single or Multi?

Subject: Re: [OM] Single or Multi?
From: dreammoose <dreammoose@xxxxxxxxx>
Date: Fri, 10 May 2002 20:28:27 -0700
This is a more coherent and conmprehensive discussion of the multicoating business <http://olympus.dementia.org/eSIF/om-sif/lensgroup/lensterms.htm>

Don't confuse the yellowish reflections from some coatings, notably early SC 50/1.4s & 1.8s, with the yellowish transmission through the glass of some 55/1.2s and a supposedly a very few, very early 50/1.4s. The presence or absence of certain colors of coating reflections is not a reliable indicator of MC as the formulas varied by lens and varied over time for some lenses. The only reliable indicator is for non-zoom, non-macro, manual-focus lenses. For them, the presence of a letter and a period/dot immediatly preceeding the word 'ZUIKO' indicates SC and all others, whether marked MC or not, are multi-coated. There is probably some obscure case where this may not be true, but it is the most reliable indicator.

Your F.ZUIKOs are garden variety early, single-coated, regular optical glass lenses.

Moose

tom wagner wrote:


Single coated lens normally appear clear. Any indication of green in the lens indicates multi-coated. A yellowish lens has "rare earth glass" mostly on a letter preceding the word Zuiko, such as "G. Zuiko". The letter indicates the number of elements, which in this case is umm....seven? I think. If this confuses you go to: http://www.ametro.net/~farrar/zuiko.html



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