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07-19-2011, 06:40 AM   #1
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18-55 WR vs Sigma 18-50. WR vs IQ ?

My other half is likely to pick up a K5 shortly for a business trip she'll be on for 12 mths. It'll be a fairly harsh environment (both temperature extremes, and abrasives etc...), so she is pretty sold on the K5's WR properties.
Plan most likely is to grab a twin-lens pack with the 18-55/50-200 WR's... she wont be in a position to play with primes so its an adequate compromise...

However - since having picked up my 18-50 Sigma 2.8-4.5 , I've been wondering.. would this be a better option over the 18-55?

I realize its not WR, however it may as well be given its all internal zoom/focus and solid build.. the electronics might not like swimming too much I guess..however water shouldn't be an issue compared to the other environmental issues mentioned... But the Sigma seems a lot sharper and more flexible than my 18-55 kit-lens I have (from the K10D bundles)...

What do people think ? Grab the 18-50 sigma, or stick with the WR benefits of the 18-55 but lower IQ ? Its more a harsh environment than a wet one.. but it might be an issue...


Last edited by adr1an; 07-19-2011 at 08:27 AM.
07-19-2011, 08:09 AM   #2
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I would go with the better IQ, and the 55-300 rather than the 50-200.
07-19-2011, 08:20 AM   #3
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This fella ? Amazon.com: Pentax DA 55-300mm f/4-5.8 ED Lens for Pentax and Samsung Digital SLR Cameras: Camera & Photo ?

Price is quite nice actually... with the Sigma 18-50 would be about the same price as the twins lens pack... would it be suitable in the environment I outlined?
07-19-2011, 07:26 PM   #4
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A little sharper? Maybe. A lot? You'd have to post controlled comparisons to make that case.

07-19-2011, 08:22 PM   #5
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QuoteOriginally posted by Marc Sabatella Quote
A little sharper? Maybe. A lot? You'd have to post controlled comparisons to make that case.
So are you saying you don't think its worth the loss of WR ?
07-19-2011, 10:48 PM   #6
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if you want significant IQ advantage, go for either Sigma/Tamron 17-50/2.8.

for the price and if you don't mind 1 stop loss of aperture speed, you maybe able to find the Pentax 16-45/4 for less than $300.
07-23-2011, 02:10 PM   #7
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QuoteOriginally posted by adr1an Quote
So are you saying you don't think its worth the loss of WR ?
Not at all. Depends on how important that small difference in sharpness is worth to you. Actually, the difference in *speed* is probably more of a factor than the difference in sharpness.
07-23-2011, 02:15 PM   #8
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keep in mind that the kit with your k10 is the first gen of the kit lens. Later it was updated to mark II for the k20d 14.6 MP sensor, and the WR follows the mark II optics.

07-23-2011, 07:45 PM   #9
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Cheers Marc for clearing that up. I really don't have many great lenses, so to me, even a minor step up in IQ seems a lot to me I'll get me a LTD or DA* one day

And scurrvy; I was under the impression that the optics hadn't changed... haven't ever bothered exploring to be honest within the 18-55 line... Maybe I should
07-30-2011, 12:43 PM   #10
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There is a thread or article on the various different kit lenses somewhere on this stie, but basically, there was the original optical design sold with cameras up through the K10D, and then the new optical design which has been used on all versions ever since.
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