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LENSTORATION: Haze On Middle Glass Element, Olympus Zuiko 75-150/4


Haze On Middle Glass Element, Olympus Zuiko 75-150/4
Haze On Middle Glass Element, Olympus Zuiko 75-150/4



One of the most daunting thoughts about cleaning lenses is that the problematic glasses to clean (eg. fungus or haze) are always the ones in the middle section of the lens, where you need to take alot of groups/elements out to get to them.

Anyway, this is not a comprehensive tutorial on how to disassemble the Olympus Zuiko 75-150mm f/4 but covers about most. I don't know the anatomy of this lens so we only rely on instinct and this photo tutorial also serves as a personal study for me. If you find it helpful, please do share to someone who may find it useful.

Haze On Middle Glass Element, Olympus Zuiko 75-150/4
75mm f/4, this was before cleaning the lens.
It was already reasonably sharp at f/4.



The case of haze with this lens was fortunate because it wasn't dried up and very easy to remove. The haze was also just on the surface, not sandwiched between the cemented glass elements. For those who will attempt to try, this should take you around 15 minutes more or less, as the construction isn't too complicated.

Last thing, something else was unintentionally fixed here. I thought this lens was a 'varifocal' zoom, meaning the focus changes when you zoom. After the cleaning, the focusing seemed to be constant when I zoom ('parfocal'), which really surprised me. I think what happened was there was a loose part inside that makes the focusing move along when zooming. This is great to know! 

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4

Haze On Middle Glass Element, Olympus Zuiko 75-150/4



The photos here were shot with a Nikon D5200 and
Tamron Adaptall 2 70-150mm f/3.5 (Model 20A)






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