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12-30-2013, 08:32 PM   #1
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houstonmacgregor's Avatar

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pentax 16-45 or tamron 17-50

As of now have
1. tamron 17-70 2.8 xr diII,
2. pentax 18-135 3.5-5.6 al {if} dc wr
3. pentax 16-45 f4 ed al.

Was thinking of selling the 16-45. Great lens but appears doo not need the coverage
Comments please

12-30-2013, 08:55 PM   #2
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If you like the Tamron the 16-45 is mostly redundant. It's a nice lens but why keep two that cover the same range?
12-30-2013, 09:17 PM   #3
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Do you use f2.8 more often than 16mm?
12-30-2013, 09:42 PM   #4
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Keep the Tamron for the lower light capabilities. Besides, it's sharp.

12-30-2013, 11:21 PM   #5
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If you have a good copy of the 17-50, keep it. I had both the DA16-45 and Tamron 17-50 at one point. I sold the DA and kept the Tammy for it's low light capabilities...and yes, IQ wise the 17-50 is superior to the 16-45 (from my experience). My only gripe about the Tamron 17-50 is built quality. After going through two bad copies in row I decided to hold off on a third.
12-31-2013, 08:51 PM   #6

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The 16-45mm, at least mine, has issues with barrel wobble, to the extent that it can affect resolution at the wider focal lengths. I couldn't detect problems when it was new with 6mp, but I can now with 16mp. Mine also has more issues with color fringing than the Tamron, although to some extent that should be correctable.

The Tamron has issues with focus field curvature at the widest settings, but that seems to be a design issue, and my one copy seem good otherwise. I need to apply the maximum focus correction (-10), and it might be that a tiny bit more would be better, but so far it seems close enough to not make it worthwhile to deal with debug mode.

If you don't have a wider lens, the 16 vs. 17mm issue might be significant. I don't know what the actual measured focal length difference is.
01-01-2014, 01:04 PM   #7
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I would keep either the Tamron for low light shooting (constant f/2.8) or go with the 18-135 for the reach and WR. Both are good optically. The 16-45 seems a little out of place when you have a constant f/2.8 and a WR all-purpose lens.
01-01-2014, 02:21 PM   #8
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FWIW I just ordered the Sigma 17-50 2.8 from bhphoto last week. Rolling the dice here with Sigma on my k10d. I m worried abt focusing issues as k10d doesnt have any per lens focus adjustment. :-(


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