Quote:
Originally Posted by dreamstation
Never did get around to updating this thread. I cleaned the eyepiece again using Don's advice with better results. There is still a light film of something on the glass but it's a lot cleaner than it was before. It doesn't seem to affect viewing through the eyepiece but it still bugs me.
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There is something about coated optics that shows up the slightest bits of oil, far more than uncoated glass. So at the point at which you would call normal glass 'clean' and be content, coated optics still look like crap, even though the performance is the same optically at the same level of clean. I think it is something similar to the effect of thin layers of oil on water. I found this out when I had two different polariser filters on two different lenses that I was shooting for a skyshow. One was *so hard to keep clean, and it was the expensive Hoya one. It was because the coatings showed up the oils, whereas the other didn't but it made no difference to the image.
Cheers
Markus