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Old 08-09-2009   #1 (permalink)
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Default Sigma 1000mm cleaning help
I bought a second hand Sigma 1000mm f/13.5 mirror lens.
As you can see in the moon picture there are dust on the mirror.
Is it any possibility to disassemble the lens and cleaning it my self?



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Old 08-09-2009   #2 (permalink)
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Default Re: Sigma 1000mm cleaning help
be very very carefull, you have a "first surface" mirror. That is, the reflective coating is on top, very easily to scratch. Much safer to do some dustspotting in PS.
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Old 08-10-2009   #3 (permalink)
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Default Re: Sigma 1000mm cleaning help
Have you checked to make sure the dust isn't on the sensor.
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Old 08-10-2009   #4 (permalink)
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Default Re: Sigma 1000mm cleaning help
Quote:
Originally Posted by R. House View Post
Have you checked to make sure the dust isn't on the sensor.
It's not on the sensor. When looking through the front lens I can easily see dots on the lens mirror.
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Old 08-14-2009   #5 (permalink)
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Default Re: Sigma 1000mm cleaning help
Photoshop is the best way to take care of your problem. If you scratch the mirror it is going to look a lot worse then a few dust spots.
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Old 08-16-2009   #6 (permalink)
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Default Re: Sigma 1000mm cleaning help
dust on or in a lens will only show up in the out of focus circles as a spot, if it's big enough, few rarely are.
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Old 08-20-2009   #7 (permalink)
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Default Re: Sigma 1000mm cleaning help
Quote:
Originally Posted by epatsellis View Post
dust on or in a lens will only show up in the out of focus circles as a spot, if it's big enough, few rarely are.
exactly. If dust shows up in the image, it is either a really thick blob on the last lens surface, which you could clean easily or it is on the sensor. Dust inside a lens will only have visible effects if it is really a big load - and then it will mainly affect contrast.

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Old 09-24-2009   #8 (permalink)
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Default Re: Sigma 1000mm cleaning help
Charles S. Fallis
2532 Keagy Road
Salem, VA 24153

FallisPhoto [at] aol [dot] com

He fixes all my old lenses

He would probably make that lens like new for $25

He is a great repairman that specializes in rangefinders but also does SLR lenses. I pick up old lenses in bad condition and he returns them to me like new, removing dust and fungus and everything.

I am not affiliated with him but I like him a lot.

Google "FallisPhoto" and you'll find him all over the 'net

Good luck!
Craig


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