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09-23-2011, 07:33 AM   #1
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New Sigma 18-250 Vs Used Tamron/Pentax 18-250 regardless of the price

I have k-5 paired with Tamron 18-200 (as vacation lens) and was going to upgrade to Tamron/Pentax 18-250 or Sigma 18-250, we travel a lot the 18-200 was working OK with k-x, but my concern is with a better IQ, I know the Sigma a bit havier, but it's ok with me.
The question is:
a side from money:
New Sigma or used/like new Tamron/Pentax?

09-23-2011, 09:01 AM   #2
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Well, they are all superzooms and as a result make compromises in image quality (usually towards the long end) - I would guess that they are all pretty similar from an IQ aspect. I had but recently sold (only due to size) the sigma 120-400mm - if you are considering the sigma with HSM and OS (or just HSM, they might not have an OS version yet), the focus is very fast and virtually silent, and a great asset. The OS can also be useful at the longer end, as it stabilizes the image in the viewfinder (note that Pentax SR has to be turned off when using the OS function). My vote for those added benefits would be the Sigma.
09-23-2011, 09:27 AM   #3
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A bit off a curve ball here but have you considered the pentax 18-135?
The IQ is probably slightly better but the lens is so much more compact than the lenses you name, perfect for travelling.
The autofocus is also much faster then the Pentax 18-250 i had, the Sigma 18-250 i believe better at this point but doubt it's as fast as the 18-135.

If you really want to gain in IQ then you need to look at the 17-70 option out there, for me these lenses are long enough for city trips and the likes so maybe they might fit your needs as well.
09-23-2011, 10:01 AM   #4
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I don't know about the Sigma, but bet it is as good as the Tamron...just guessing it may be a bit "warmer" in tone.....and more saturated? Just from my Sigma experience, and not with the 18-250.

I can only tell you for certain that I love using the Tamron 18-250 on my K5. The higher ISO makes it plenty fast, and the AF is fast and sure. The IQ is good to excellent, and of course the versatile range is fantastic for a walkabout lens. It puts a smile on my face every time......
Regards!

[IMG] [/IMG]

09-24-2011, 06:50 PM   #5
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Nice picture, thanks guys for the input, I am going to NY tomorrow, hoping to get some answers about Sigma, since it is available in the store. I wish Pentax staff would be available in Philly.
09-25-2011, 12:11 AM   #6
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Plenty of posts on this forum with same or very similar question about the super-zoom comparisons...I think you'll find more positives regarding the Pentax/Tamron 18-250 than any other. Keep an eye on the Marketplace as they come up for sale every so often.

Jason
09-25-2011, 03:12 AM   #7
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QuoteOriginally posted by ishchupak Quote
Tamron/Pentax 18-250 or Sigma 18-250
...
New Sigma or used/like new Tamron/Pentax?
What most people forget to mention:

K-5 plus Tamron/Pentax 18-250 is a supported combination by DxO. The alternative lenses aren't (except the DA 18-135).

DxO does real wonders(*) for a lens like a super zoom or a commodity zoom. I would never consider such a lens w/o pairing it with DxO.

__
(*) at low enough iso which is a result of the way DxO tries to invert "lens softness".
09-25-2011, 03:20 AM   #8
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QuoteOriginally posted by falconeye Quote
.

DxO does real wonders(*) for a lens like a super zoom or a commodity zoom. I would never consider such a lens w/o pairing it with DxO.
__
(*) at low enough iso which is a result of the way DxO tries to invert "lens softness".
Is there any difference in the quality of the lens corrections achieved in DxO & PhotoAcute (besides the other features that PhotoAcute has)?

Dan

09-25-2011, 04:40 AM   #9
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QuoteOriginally posted by dosdan Quote
Is there any difference in the quality of the lens corrections achieved in DxO & PhotoAcute
Dan, I don't know.

PhotoAcute knows much less lenses and I don't know if they take their lens softness calibration into account when doing anything else but superresolution.

IMHO, DxO is the way to go when importing superzoom images from a SLR. Personally, I use DxO in conjunction with LR.
09-25-2011, 08:39 AM   #10
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Falk, I am not too familiar with DxO, but appreciate that info. I will look into it, since I use the Tamron 18-250 quite often. I am currently using the trial of DxO Film Pack 3 and find it amazingly good and easy to use......key word for an old Squirrel shooter, being "easy".
Best Regards! Thanks again! You can learn a lot here!
09-25-2011, 08:50 AM   #11
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DxO is a fantastic program. It will bring your Tamron 18-250, not to the next level, but to the level after that one. (I use it with my kit lens, but I used it with a Pentax 18-250mm as well.) The only problematic aspect of DxO is that it supports comparatively very few lenses in the K mount. (All, or almost all, Nikon and Canon lenses, as well as all third party lenses in Canon / Nikon mount are supported.)
09-26-2011, 01:45 AM   #12
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QuoteOriginally posted by causey Quote
The only problematic aspect of DxO is that it supports comparatively very few lenses in the K mount.
If you think about it, that may have been the reason why I posted in this thread ...

The thread is about the Sigma 18-250 vs. Tamrom/Pentax/Samsung 18-250, both for the K mount.

And DxO may be the decisive reason why to go with the Tamron/Pentax/Samsung.
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