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04-19-2008, 05:33 AM   #1
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Fujinon EBC 85mm f4 soft focus help

Hi, does anyone know what the silver ring on the lens for? It's behind the distance scale and can turn about 1cm to the left.


04-19-2008, 07:34 AM   #2
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QuoteOriginally posted by vanchaz2002 Quote
Hi, does anyone know what the silver ring on the lens for? It's behind the distance scale and can turn about 1cm to the left.
I have the same lens and was also wondering what was the purpose of this spring loaded chrome ring. I finally found the answer in a Richard Groome's post on

This is from the November 1974 Popular Photography profile of the new lens introduced at Photokina:

"A special feature of this lens allows for the fact that when using the split-wedge focusing aid in the Fuji ST-series SLRs the viewfinder's optical system produces a focusing aperture of f/6.3, rather than the full aperture of f/4. The result is that a focus shift is produced because of the deliberately large degree of uncorrected spherical aberation. To compensate for this focus shift and to make sure that the same degree of soft focus appears on film as observed in the finder, a narrow ring that's located behind the focusing collar is grasped together with the focusing collar, and the two are turned in the direction of an engraved arrow until a stop is reached. This extra step is best taken after best focus has been determined accoreding to the split-wedge focusing aid in the viewfinder. If the plain frosted portion of the viewscreen is used for focusing, there's no need to go through this focus shifting step."


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