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07-30-2011, 02:25 PM   #31
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I agree. Canon USM is fast and reliable. This is one area that Pentax could focus R&D money in and effectively improve their whole line of current lenses. Autofocus system is another. That is why I think making more prime lenses should be the least of their priority, since they already excel in that department.

07-31-2011, 08:28 AM   #32
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We got a new EF300/4 L IS USM at home. I hope it will prove itself reliable, but it is not faster than some lenses I use with the K-5. I just need to find someone nearby with DA*300 to compare it with the peer.
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