Thanks, Mel. That probably means it won't help on the OM 65-200/4
either but I think we'll soon know.
Chuck Norcutt
On 5/4/2011 10:24 AM, mes9120 wrote:
> Hi, guys and gals -- my first post although I have been enjoying
> reading your stuff for months. I first posted my cloudy lens element
> problem to the Kiron Klub. Apparently a cloudy lens in a 28-85
> varifocal is rare. Mine was made in 1980. It is the next-to rear
> element in the rear lens group. With the OM mount removed, nothing
> more, the back half of the rear lens group unscrewed rather easily,
> and elsewhere there was indication that someone else had carefully
> been into this "for parts" lens properly described by the Ebay
> seller. When unscrewed, the subject lens element fell out on my
> padded work table while the coated rear element remained in place. I
> was surprised to find no coating on the hazy element.
>
> It is not a cemented doublet.
>
> Being a chemist among other things, of course I tasted the lens by
> touching my tongue to it. At first I thought this showed the haze to
> be only on the surface, but later study in a grazing light with 25x
> magnification convinced me that the haze is uniformly distributed
> throughout the glass. Cleaning the surface had no effect.
>
> I mounted the lens element about 4 cm from a new 9 watt UV-emitting
> "PL-1" mercury lamp for 36 hours and could detect no change
>
> Mel
>
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