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11-12-2011, 12:48 PM   #1
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Weird problem with 55-300mm DA lens at 100mm

Isn't it typical: I was getting ready to sell my DA 55-300mm, and now it is acting up.

Everything seems to work correctly, EXCEPT when the focal length is around 100mm. When zoomed to around 100mm it will usually not focus, and the reported aperture suddenly goes down to F1.0. Obviously the electrical connections between the lens and the camera does not work right. I cleaned the contacts on both the camera and the lens, but to no avail. Again, it works fine when on 120mm and above, and 90mm and below.

Any suggestions other than sending it to Pentax?

11-12-2011, 05:20 PM   #2
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Join Date: Sep 2006
Location: Copenhagen, Denmark
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By the sound of it it is the contacts inside the lens that doesn't work. There are some sliding contacts that read the focal length as you focus. On some F type lenses these contacts could be somewhat fragile. Perhaps the same is the case on this lens.

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