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02-04-2010, 09:42 AM   #1
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"Oil on the Blades"

I understand that oil on the aperture blades is not that good. But what does it actually effect. Does is still have its effect if the lens is used in manual mode?

02-04-2010, 09:56 AM   #2
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QuoteOriginally posted by MikesChevelle Quote
I understand that oil on the aperture blades is not that good. But what does it actually effect. Does is still have its effect if the lens is used in manual mode?
Worse case, it will keep the aperture blades from stopping down at photo time. In most cases, they will be slow to move so you'll never really be sure of what aperture you are getting. Oil bladed lenses are best avoided if at all possible.
02-04-2010, 02:47 PM   #3
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https://www.pentaxforums.com/forums/pentax-beginners-corner-q/69995-oil-apeture-blades.html

Check out this thread half way down the page. It has some good info on what the oil/grease on the blades is affecting and why it can cause trouble.
02-07-2010, 04:00 PM   #4
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How to use an oil-on-the-blades lens:

1) Focus and shoot wide-open only
2) Focus and shoot stopped-down only
3) Use the lens for target practice, paperweight, doorstop, decoration, etc

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