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09-15-2007, 05:23 PM   #1
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Ready to replace my 18-55, but with which lens?

I have both the 18-55 and the 50-200 for my K100D (as well as the 50mm 1.4) but I'd really like to replace my 18-55 with more of a walkaround lens since I find myself changing lenses more often than I would like, especially on vacations. These are the lenses I'm looking at...

Sigma 18-125 f/3.5-5.6
Sigma 17-70 f/2.8-4.5
Sigma 28-70 f/2.8
Tamron 28-75 f/2.8

I'd prefer the 18-125 due to the cheaper price and longer range but I know I'd be sacrificing some image quality compared to those lenses with a shorter focal range (but I only do this as a hobby so I question whether the reduced image quality would even be noticeable to an amateur like myself?). My second choice would probably be the Tamron based on the many good reviews I've read about it although I'd be concerned about it not being wide enough. Any input would be greatly appreciated!!

09-15-2007, 05:27 PM   #2
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I would vote for the Tamron 28-75/f2.8 since that's the way I did it to replace my 18-55. It is now my primary walkaround lens. I find it is a sharp and good lens.
09-15-2007, 06:18 PM   #3
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Out of your choices, I would go for the Tamron 28-75mm f/2.8. I ended up replacing my kit lens with the Sigma 18-55mm f/2.8 MACRO because I tend to use the wide angle more, but if you desire a bit more reach, the Tamron would be a great choice. The Sigma 17-70mm also is a great choice recommended by many if you don't mind not having a constant f/2.8.
09-15-2007, 06:48 PM   #4
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Have you looked at this lens?

AF18-250mm F/3.5-6.3 Di II LD Aspherical (IF); Tamron USA, Inc.

I believe this lens is getting a lot of good reviews, and is ideal for the reason why you are looking for another lens.

09-15-2007, 07:29 PM   #5
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For myself, I could never imagine not having a lens that goes down to 17 or 18mm. I use it all the time. That being the case I recommend the Sigma 17-70. But it really does come down to what you take pictures of.
09-15-2007, 07:44 PM   #6
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I have the kit lens and the Sigma 17-70. I like the Sigma better. It has much less vignetting and has that extra 15mm. The color is nice and crisp too.

09-15-2007, 07:44 PM   #7
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I am looking at the same thing ....

I have this blog post seeking for the similar things looking for replacement of kit's lens in

thoughts on kit's lens
Thoughts on Pentax DA 18-55 - Hin's Tech Corner

Pentax Protrait Lens - Hin's Tech Corner

And so far I ended up with FA 50 f/1.4 for indoor portraits and I am still on the lookout for a possible zoom replacement. Sigma 17-70 and Tamron 28-75 are my first choices but I also consider the following cheaper ones as alternatives

- Pentax 28-105
- Pentax 35 - 105 (manual focus, quite heavy, I think)

Please update me what you end up having as I am interested in the same thing.

09-15-2007, 08:37 PM   #8
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28mm is not very wide. I'd take either of the 17-X or 18-X you list, though I chose the Sigma 18-50 2.8 when I was shopping (never had the kit lens). It might be a tad short if it is the only lens you have with you.

09-15-2007, 09:09 PM   #9
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All depends on your shooting style.

I never found myself missing out on the the short end on the Tamron, so it works perfectly for me.
09-16-2007, 12:09 AM   #10
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Why not stick to pentax. Buy a good point and shoot for vacation or live with facts like changing lenses and a heavy photobag along you shoulder.
09-16-2007, 12:20 AM   #11
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Now there is something I do not quite understand.

OP is asking advice for replacement of 18-55mm lens. Now there is lot of advices to buy 28-XX mm or 35-XX mm lenses. Please explain me how these can replace an 18-55mm lens?

Field of views are not compatible at all.... is there some assumptions that are not said aloud?

For me zoom starting from 28 or 35 mm cannot replace lens starting from 16 or 18mm. It is as ridiculous as to say that you can replace DA 14mm with FA 35mm..... you cant.
09-16-2007, 05:03 AM   #12
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The reason I suggested an 18-250 is because the OP stated that he did not like to carry too many lenses with him in the field, and did not like switching them there also.
09-16-2007, 09:05 AM   #13
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That Tammy 18-250 sounds like a good choice for your wants.
09-16-2007, 09:44 AM   #14
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You can't go wrong with any of the lenses people have suggested, it depends on your personal needs. I have both the Sigma 17-70 and the Sigma 18-125. I have found them very good lenses with the 17-70 a bit sharper. I found myself wishing for that extra bit of reach and tried out the 18-125. It is also quite a bit lighter than the 17-70.

I have now started using it as my main walk around lens.

This image is from a local Country Fair yesterday. It is right out of the camera with nothing done to it except the website software resizing. The full size image is very sharp.
Sigma 18-125 125mm F5.6 1/180 ISO 100 Taken on K10D

09-16-2007, 01:09 PM   #15
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QuoteOriginally posted by Geyst Quote
Why not stick to pentax. Buy a good point and shoot for vacation or live with facts like changing lenses and a heavy photobag along you shoulder.
Because Pentax lenses are not the be-all and end-all of lenses? Third-party lenses CAN be good, and in some cases better than Pentax.

For example:
Pentax has nothing that compares to the Bigma
Pentax's 75-300 can't even remotely compete with Tamron and Sigma's 70-300 offerings

From what I have heard (and seen in a few comparisons on this forum), if you don't need the wide end of the DA* 16-50, the Tamron 28-75 blows it away in terms of image quality at a far lower price.

There is no reason to stick with first-party Pentax lenses. There isn't anything special that makes them THAT much better than third party lenses, and in fact many are worse than their third party counterparts (see the 75-300 for example).

To the OP:
From all I have read, the Sigma 17-70 and Tamron 18-250 are excellent candidates to replace your kit lens. That said, I'm not sure if you can ever outright replace the kit lens.
1) Its image quality is exceptional for a kit lens. It can't compete with better lenses such as the Sigma 17-70, but
2) It is far smaller and lighter than any possible replacement that exceeds it in image quality. In some situations you will need to sacrifice some image quality for compactness.

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