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04-23-2010, 12:58 PM   #1
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Re: DA40mm Repair

Looking for advice on a DA 40 w/ slow aperture blades.

The lens itself is approx 1 & 1/2 years old. It is out of warranty. Something inside is causing the aperture blades to close slower than normal when shooting, causing overexposure at f-stops above 5.6. Glass itself is pristine.

The question is this. Is it worth having Pentax repair it for approximately $170 (the quote they gave me)? I only paid around $200 for it new, with 1 yr warranty.

Or, is there a cheaper way to get it fixed? Should I just sell it for what I paid for it $200 and tell the buyer they will need to fix it (I assume some buyers would have the skill to do it on their own).

Not really looking to dump more money into the lens.

Thanks for any and all advice!

04-23-2010, 01:17 PM   #2
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Usually slow aperture is due to either aging spring or oily blades. Since the lens is that new, old spring is unlikely. Perhaps too much grease was applied and leaked to the aperture due to heat. Another possible cause is that the aperture lever at the rear was bent outward and got stuck with the body. Just push it inward slightly will do. Or the lever was held by 2 screws and loosen somehow? For whatever the reason, it should not be difficult or expensive to fix since it is a very simple lens to start with.
04-23-2010, 05:59 PM   #3
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Are you using the lens? If yes, have it fixed. If no, sell it.

Or look at it this way: you currently don't have a DA40, will you buy one at $370? (assuming you can sell the current one for $200, which may or may not be possible).
04-26-2010, 10:38 AM   #4
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Thanks for the feedback. I was thinking the same thing. Do you know of any how-to guides for opening up a DA Ltd lens?

Thanks again.

04-26-2010, 10:40 AM   #5
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I asked myself the same question.

The answer is no - I don't think the lens is worth $370. It is a good lens, but I think I get better value out of my Nokton at that price level.
04-26-2010, 02:49 PM   #6
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QuoteOriginally posted by PHams Quote
Thanks for the feedback. I was thinking the same thing. Do you know of any how-to guides for opening up a DA Ltd lens?
You will have to work from the rear. You can either remove the plastic black cover on the rear (held by 3 tiny screws from the side), or the whole lens mount (5 chrome screws (very tight so a perfect fit driver is needed)).
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