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Forum: Pentax K-1 & K-1 II
10-15-2016, 11:17 PM
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The lenses you were using aren't comparable to the 24-70. The 18-55 in particular is a very quick focusing lens due to its short focusing throw. The K5II may have had its lens correction option set to "off" and that of the K1 being "on" (slowing processing time significantly). The K3 using a non-Pentax lens doesn't have that factor in the equation. The Tamron 17-50 is similarly a very quick focusing lens. I'm not sure why there would be a huge difference in focusing ability even with the Pentax FF lens on the K1 but that may be a part of the explanation. To investigate it more accurately, you would test low light focusing on the same subject under the same lighting conditions using the same lens on both het K1 and K5II (or K3II). I hope this is not sounding patronising if you are well aware of these aspects. If there is a big difference still, and you have the latest firmware, post your data here and let us know.
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