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12-21-2008, 10:30 AM   #1
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problem in my DA* 300

I got my DA* 300 for a while. But today when I clean my len, I found that the apertures is not in a very good shape. One of them is in a wrong position which it's not in a perfect circle. Any impact on this? What can I do?

12-21-2008, 11:16 AM   #2
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If its a DA*300mm then it is probably under warranty, check your credit card to see if you have extra coverage.

Send it in to get it fixed. It will screw up exposure, and impact the image quality.
12-21-2008, 01:49 PM   #3
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It's not unusual for this to occur on the very smallest apertures, but if the opening isn't pretty symmetrical by about f/11 or so then you should probably have it looked at.

For example, here's my 50mm f/1.4 at f/22. You can see that the edge of the opening at the upper right is nearly twice as long as the edge just counterclockwise from it. But I'd consider this quite acceptable for f/22.

12-21-2008, 08:32 PM   #4
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Even the blade edges fringe in this Fa 50mm blades... Good capture to get so much details in this one though!

12-21-2008, 08:50 PM   #5
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Depends on how bad it is. Of all the Pentax lenses that I have purchased in the last decade, none of them had perfect aperture shape. 2 of them were so bad I didn't buy one (FA135), and rearrange the other myself (FA77). Slight variations usually have no practical impact. My suggestion is for any lenses or cameras, if there is no practical concern, try to live with it if exchange is not an option because there is always a chance the techicans might mess it up further (techicans won't baby your gears they same way you do).

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