Not sure if I'm happy


Carol8345

Link Posted 23/08/2017 - 23:08
So, I decided to sell the trusty K50 and the 2 kit lenses as a bundle to a friend, (I really don't want to sell it). So I went out and bought a Sigma 17-50 2.8 lens this weekend to replace my kit lens. I don't think the image quality is really any better! Most of my city shots are with that 18-55 or my 50mm. The 24-70 isn't available here yet. Could it be me? Does it take some getting used to?
My Instagram
Last Edited by Carol8345 on 23/08/2017 - 23:08

JAK

Link Posted 24/08/2017 - 00:29
What you've discovered is that the Pentax 18-55 kit lens is much better than similar lenses by other marques. Probably the best of the kit lenses. See someone else's thoughts on that comparison here: https://www.dpreview.com/forums/post/38371841
Their verdict was the Sigma is worse.
Rather than getting the full frame Pentax 24-70, which while a good lens is overkill for APS-C, for APS-C use have a look at the 16-85. I find that's a brilliant lens, especially given its really wide angle. I'm sure you wouldn't regret getting one of those!
If you really want a Pentax 24-70, I can't believe they haven't made New York yet! B&H have them in stock for mail order or you could call in! https://www.bhphotovideo.com/find/HelpCenter/StoreInfo.jsp#nycSuperstore
Bear in mind though that its much heavier than the APS-C lenses you have and doesn't go anywhere near as wide, viz 24mm compared to 18mm or wider. However, if purchase of a K-1 is being considered then that's another matter.
John K
Last Edited by JAK on 24/08/2017 - 00:30

Carol8345

Link Posted 24/08/2017 - 01:25
HI Jak, the new lens weighs over a pound, that is a lot of weight to carry through nyc with the K-3II body. My goal was to leave the bag at home so to speak and have an all around lens for street and architecture. I was at B&H over the weekend and this is where I picked this one up. I'm going to really check out the 16-85 and possibly take this one back.
My Instagram
Last Edited by Carol8345 on 24/08/2017 - 01:48

Jonathan-Mac

Link Posted 24/08/2017 - 08:08
The Sigma 17-50mm is reputed to be very good. If you're not getting sharp results (you said they're no better, but not why, so I'm guessing) then it may be that you need to fine-tune the focusing. The other possibility is that you have a faulty copy of the Sigma.

The Pentax 18-55 kit lens is fairly good when stopped down but an f/2.8 standard zoom should be better, no matter what brand it is. My Tamron 17-50 f/2.8 is as good at f/2.8 than my kit lens is at f/8, and the kit lens is pretty sharp at f/8.
Pentax hybrid user - Digital K3 & K200D, film 645 and 35mm SLR and Pentax (&other) lenses adapted to Fuji X digital
Fan of DA limited and old manual lenses

paulcliff

Link Posted 24/08/2017 - 08:45
I own both the 17-50 f2.8 HSM and the 18-55 DA, and have previously owned the DA L.

I find the images from the Sigma much better than the Pentax, not to say the images from the Pentax are bad at all.

I actually prefer the size of the Sigma VS the Pentax, I also like the silent focusing and of course it's f2.8, which is nice.

I pretty much only keep my Pentax because it's weather sealed and I can pop it on the K3ii if its raining.

Do you have any comparisons shots showing your problems?
Flickr: https://www.flickr.com/gp/cliffo88/513746

McGregNi

Link Posted 24/08/2017 - 08:46
I think that's a fair assessment (going back to Jonathan-mac). Both my "kit lenses". DA 18-55 and D FA 28-105 are at their best from F8 to F11. The main point of a constant F2.8 zoom is that it is still "near best" wide open ....I never use my two "kit" ones wide open. It's never a real compromise for me, because my low light situations are when I'm using flash, but for the outdoor user without flash or shooting streets in low light then the widest apertures might have more significance.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Last Edited by McGregNi on 24/08/2017 - 08:47

ilovesaabs

Link Posted 24/08/2017 - 11:24
Must be the famous sample variability - I had an extremely poor 18-55 DA, but I have had instances where lenses have been good on one camera but very poor on another, and not just with Pentax. I am sure the dealer in NY will be fairly obliging, also look at the 18-135 DA, or see if there are good deals on the DA*16-50
AKA Welshwizard/PWynneJ
Assorted Pentax/Nikon/Mamiya stuff

JAK

Link Posted 24/08/2017 - 11:45
Jonathan-Mac wrote:
The Sigma 17-50mm is reputed to be very good. If you're not getting sharp results (you said they're no better, but not why, so I'm guessing) then it may be that you need to fine-tune the focusing. The other possibility is that you have a faulty copy of the Sigma.

Is fine tuning an option with non Pentax lenses? I understand that all Sigma lenses are recorded as 'Sigma Lens' so altering it for one lens would affect any other Sigma lenses. The global re-tune would put all the other lenses out.
And yes, it could be a poor copy of the lens so if you like it in principle, but not the results you're seeing, see if you can try another one. I've got a Sigma 24-60 f2.8, an earlier incarnation of that lens and it is really very good but again designed for full frame. It is pretty well inevitable that full frame f2.8 lenses are going to be heavier than similar lenses designed for APS-C wih a more modest aperture. I'm with you that sometimes the lighter combination means you take the camera with you rather than not bother due to its weight, hence I take out an MX-1 or K-S1 with 16-85. It really isn't always worth lugging heavy gear round on a visit to the supermarket!
John K
Last Edited by JAK on 24/08/2017 - 11:51

Algernon

Link Posted 24/08/2017 - 12:31
My favourite lens tester has done a test of this lens on a Canon 6D
I don't know why other people can't manage similar tests and be so straight to the point.

Actual test results are from about 3 min 20 sec...

https://www.youtube.com/watch?v=t_rPxWpArNY

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

Grandy262

Link Posted 26/08/2017 - 05:24
Carol8345 wrote:
So, I decided to sell the trusty K50 and the 2 kit lenses as a bundle to a friend, (I really don't want to sell it). So I went out and bought a Sigma 17-50 2.8 lens this weekend to replace my kit lens. I don't think the image quality is really any better! Most of my city monsu 2 apk shots are with that 18-55 or my 50mm. The 24-70 isn't available here yet. Could it be me? Does it take some getting used to?

Can you post the images of your 2 kit lens?
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