It's just so darn quiet
This is the first Pentax SDM lens I have ever owned
I have to check all the time to make sure it's working as you can barely hear it.
Great results so far
Noticeable curved horizons when I take photos at 17mm
Also a bit soft at F4, but once you get to F5.6 and smaller, you can't really tell
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|High Altitude Rocky Mountain Railroad by cjf2|
from On the Rails...
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