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12-08-2012, 10:05 PM   #1
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DA 18-135mm f/3.5-5.6

Lately I have a chance to play briefly with SMC Pentax-DA 18-135mm f/3.5-5.6 WR. I should say, I felt some disappointment after I noticed significant airflow motion in and out of the lens during the change FD. It felt like the manual air pump. That means that in the rainy day the highly humid air will be sucked into lens/camera. So even with WR lens/camera I should remove the lens and dry my gears after outside shooting.

Any thought about my observation?

12-08-2012, 10:49 PM   #2
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All zooms pump air in and out. If they didn't then air pressure would prevent you from being able to move the zoom. No idea what climate you are in but in NW Oregon it rains a lot, so I always clean and dry my gear after coming in.

Humid air is not normally a problem unless it condenses. This can happen if you enter a warm humid area with cold gear, entering a warm dry area such as a heated home is not usually an issue because the ambient humidity is lower than the air in the lens.

I have spent a lot of time in wet weather and never had a problem, but like I said, I always clean and dry when I come, WR or not.
12-09-2012, 09:32 AM   #3
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I think what make DA* 50 -135 mm F2.8 a true WR in compare with DA 18-135 mm WR is the absence of the external movable parts.
12-09-2012, 09:45 AM   #4
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I've had my 18-135mm out in rain and snow numerous times and it performed flawlessly.

12-09-2012, 09:33 PM   #5
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I too have had my 18-135mm out in the rain, snow, and drastic humidity changes without any issues. Once I am done using the lens, I always give it a proper clean up.
12-09-2012, 10:09 PM   #6
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QuoteOriginally posted by calculator01 Quote
I always give it a proper clean up.
I don't.
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