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Old Oct 31, 2006, 7:35 PM   #1
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I have the DL + the kit lens 18-55/3,5-5.6. Is it worth to upgrade to a Sigma 18-55/2,8 or Sigma 17-70/2,8-4,5? Are the later 2 lenses much sharper than the kit lens?

Thanks for your info!

Simon
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Old Oct 31, 2006, 8:56 PM   #2
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Hello. I have the 18-55mm kit lens for my k100d. I've been very impressed with it so far considering it is a "kit lens." Here is a sample of all of my shots that were taken with this lens. It's the only lens that I have at the moment, but I am planning on upgrading to a zoom telephoto lens soon. Not sure that getting a sigma lens in the samefocal lengthwould yield that much better results.

http://flickr.com/photos/royce10/set...7594242702790/
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Old Oct 31, 2006, 9:34 PM   #3
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I have acquired two copies of the kit lens so far, the first one was got with my *ist DS and the second one was with my K100D. What I can tell is the second one is better than the first one, there is less vignetting plus there is no focus point shift at different focals which occurred for the first one.

Other than the above two differences, in general, the two lenses behave quite similar. They are quite sharp in the image centre, color rendered is accurate and please, it is a little bit contrasty for the image reproduced. The down sides are corner blur, which doesn't help even when dstopped down considerably and obvious distortion.

In short, the kit lens is a good general purpose lens for general use. It does produce acceptable images for general shootings and it is light and compact.

Forget about the Sigma, you will only get inferior image from them for most cases. Believe me, at least personally I don't like the image characters of any Sigma lenses I owned and used. Do note also that Sigma lenses mean flare which applies well usually! (Vs Pentax lenses = good/excellent flare control)

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Old Oct 31, 2006, 11:24 PM   #4
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I saw you post, and I have an interest apparently along the same lines (wide angle shots). I too have the 18-55 kit lens and have been trying to decide if I should get a better lens or just improve the photographer. I took a vacation to Mexico for a week and use the lens a lot (about 500 images) and wide open it does have a problem with vignetting. I also took a number of panoramic shots again wide open, however found that when stitching them together, allowing for some generous overlapping that there was more distortion than I would have expected in terms of aligning the images. However, I was quite pleased with the color – to me, it was dead on. I also think, that again wide open, the auto focus seemed to hunt quite a bit more than expected, and was getting a bit concerned that I would burn out the focus motor, so was very careful to just stop – focus else where then go back and compose the original frame again. The other item that I am noticing is the sharpness. Given that I was getting use to the camera K100D, (moved up from a Spotmatic II) was experimenting with DOF settings on the camera and also bracketing for trying out HDR, I was surprised on the sharpness – however I will take the blame as possibly I was not paying that much attention.

So I have been doing some looking the last few months. I found some sites that has some lens performance comparisons that may interest you also – and a few that include the lens that you are looking at. I am pondering over the Pentax 16-45 f4 zoom or the Pentax 21mm limited prime. The 16-45 has $100 rebate and it looks like its available on the web for $200 (after the rebate, usually I see its about $500). I am also thinking just using a prime – forgetting about zooming and just concentrate on the picture (and becoming a better photographer). Anyway, here is the first lens performance web site
http://www.photozone.de/active/survey/querylenstxt.jsp?filter=%22brand='Pentax'%20OR%20b rand='Sigma%20AF'%20OR%20brand='Tamron%20AF'%20or% 20brand='Tokina%20AF'%20or%20brand='Vivitar%20AF'% 22

If you hit the [back] button at the top – it gives some guidance as to how the data was collected and the lens evaluated.

Here is a second lens review site for Pentax supported lens (Pentax, Sigma, Tamron, Tokina, etc., however I do not know how current the lens selection is since there is no listing for the Pentax kit 18-55
http://www.dcviews.com/lenses/Pentax-comp-lenses.htm

Here is another lens review site (did a query for Sigma)….
http://www.slrgear.com/reviews/showcat.php/cat/31

Here is a site on third party lens
http://medfmt.8k.com/third/cult.html

… and last but not least Stan's Page (I did not see anything about the 18-55 lens here either so in terms of comments on new lens – I do not know).
http://stans-photography.info/

Here is a thread on the 16-45 vs 18-55 that may have something to interest you…
http://pdml.net/pipermail/pdml_pdml....er/032535.html
http://pdml.net/pipermail/pdml_pdml....er/032539.html

I've included a 2 image pan that highlights the vignetting and the distortion along the edges, but this is just automatically stitched together…

Hope this helps.

PS - My wife and and I are going to St. Petersburg Russia on a Baltic cruise next summer and I am trying to decide if the 18-55 is ok (only paid $20 in the kit for it), so should I splurge and get either the 16-45 or the 21mm limited prime. We are going to the Hermitage Museum and I would like to come away with some REALLY nice images.

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Old Nov 1, 2006, 1:03 AM   #5
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I got K100D with kit lens. It has proved to be a very good lens for the lil extra u pay and u can get some pretty decent results from it. It allowed me to free up cash to get lenses of other lengths which is not a bad thing

Plan is to save and get the DA 16-45 f2.8 next year and until then the kit is just fine
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Old Nov 1, 2006, 2:33 AM   #6
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storgrejen wrote:
Quote:
I have the DL + the kit lens 18-55/3,5-5.6. Is it worth to upgrade to a Sigma 18-55/2,8 or Sigma 17-70/2,8-4,5? Are the later 2 lenses much sharper than the kit lens?

Thanks for your info!

Simon




One thing I notice is that the kit lens and both Sigma you mentioned are relatively weak in low-light situation.

I suggest you read this thread

http://www.stevesforums.com/forums/v...537635#p537635

The inexpensive and legendary 50mm like M50mm1.4 or 1.7 or A50mm1.4 or 1.7 are top notch optics. From time to time I see them at ebay at around $50 - $90.

Daniel




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Old Nov 1, 2006, 2:47 AM   #7
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danielchtong wrote:
Quote:
storgrejen wrote:
Quote:
I have the DL + the kit lens 18-55/3,5-5.6. Is it worth to upgrade to a Sigma 18-55/2,8 or Sigma 17-70/2,8-4,5? Are the later 2 lenses much sharper than the kit lens?

Thanks for your info!

Simon




One thing I notice is that the kit lens and both Sigma you mentioned are relatively weak in low-light situation.

I suggest you read this thread

http://www.stevesforums.com/forums/v...537635#p537635

The inexpensive and legendary 50mm like M50mm1.4 or 1.7 or A50mm1.4 or 1.7 are top notch optics. From time to time I see them at ebay at around $50 - $90.

Daniel



You say weak but i have handheld the kit lens at high iso in night shots and got good results.....down to the SR i guess
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Old Nov 1, 2006, 6:38 AM   #8
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interestingly, the 'kit' lens i got with my K100D (and i assume its standard in Australia) is the Sigma DC 18-50 f3.5-5.6 , presumably to keep the cost of the package low. However, browsing a uk photography magazine today, there was a kit lens comparison, and it did turn out that the sigma is rated quite favorably amongst the kits, even above some mfg kit lenses.
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Old Nov 1, 2006, 7:59 AM   #9
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The kit lens part at above 50mm could only be wide open at F5. That is weak. Also he has DL with no SR . Individual skilled user like you may be ok. Average people will have problem in low light situation. A fast 50mm is always handy as a walkaround lens.

Daniel

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You say weak but i have handheld the kit lens at high iso in night shots and got good results.....down to the SR i guess
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Old Nov 1, 2006, 8:04 AM   #10
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Interesting links - you've given me something to read and think about. Just my opinion, but I'd be really tempted by the limited lens - the pictures I've seen it take are outstanding. However, since you'll be traveling, a zoom makes more sense. If it were me, I'd be sense-less and buy the limited.
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