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05-05-2011, 10:54 AM   #61
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Cant' see any of sample photos from Armanius.
What am I doing wrong??

05-05-2011, 02:47 PM   #62
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QuoteOriginally posted by elho_cid Quote
welcome!
please do not be offended by the lack of response. But the lens you are asking about is not very attractive. Usually people buy Tamron if they are limited by budget or DA* pentax when they want the best standard zoom.
Sigma doesn't seem attractive to many in this competition.
Sorry but I disagree! The Sigma 18-50mm test reports are convincing, and even more the lens I bought. IQ is very good already at f/2.8 and even better in that respect than my Pentax DA* 16-50, which otherwise is superb. But as some people say, both Sigma and Tamron lenses show some obvious quality variation, so the best thing to do is to test single lenses in the shop before buying them.
07-06-2011, 01:17 AM   #63
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Bonjour
Je suis un petit nouveau sur ce forum!!!

Je me présente : Eral 95 du forum Pentax K par K (in France)

J’ai un K-5 avec un 12-24 et un 50-135
Je recherche un zoom entre ces 2 types d'objectifs
J’ai pensé au 17-50 de chez SIGMA
Il est très difficile d’avoir des retours d’expérience sur ce nouvel objectif
J’ai écris un post qui résume toutes les informations disponibles en ce moment sur le net
Adresse
SIGMA 17-50mm F2.8 EX DC OS HSM Pentax, hormis son prix, que faut il en penser ?


Hello!!
Heureux propriétaires de ce SIGMA 17-50 faites nous part de vos remarques !!!
Bonnes ou mauvaises...

Accompagnées si possible avec de magnifiques photos pleines tailles
Merci d’avance
Bien cordialement
ERIC
07-06-2011, 07:17 AM   #64
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I use the Original Sigma 17-70/2.8 with my K-5s. Excellent lens!!!

07-06-2011, 07:28 AM   #65
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QuoteOriginally posted by Staffan Quote
Sorry but I disagree! The Sigma 18-50mm test reports are convincing, and even more the lens I bought. IQ is very good already at f/2.8 and even better in that respect than my Pentax DA* 16-50, which otherwise is superb. But as some people say, both Sigma and Tamron lenses show some obvious quality variation, so the best thing to do is to test single lenses in the shop before buying them.


....and we haven't seen some huge variations in Pentax products...from lenses to bodies? I have three Sigma lenses, all excellent, all without problems from day one. I buy for the IQ and Tamron and Sigma have been steadily improving.....Pentax seems to have been going backward. Hopefully the Ricoh deal will correct this.

While I am here...Thanks Tamron and Sigma for giving us some affordable alternatives in K mount glass. Most of us appreciate it. Some don't, and prefer to shoot with a Pentax 50-500...they just have a hard time locating one, and if they find it , it will most likely be about $3K.

Squirrels maybe "corny"...but they love the Bigma!
[IMG] [/IMG]

Best Regards!
07-06-2011, 08:38 AM   #66
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Any concerns about this lens not being WR?

I plan to shoot a lot in harsh environments (jungles, mountians) and don`t want to be lens to be a weak spot on my K5 tank
07-07-2011, 12:01 AM   #67
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QuoteOriginally posted by eral95 Quote
Hello!! Heureux propriétaires de ce SIGMA 17-50 faites nous part de vos remarques !!! Bonnes ou mauvaises... Accompagnées si possible avec de magnifiques photos pleines tailles Merci d’avance Bien cordialement ERIC
QuoteOriginally posted by Smeggypants Quote
J'utilise le Sigma 17-70/2.8 originale avec mon K-5. Excellent objectif!
Désolé mais nous sommes bien sur un post qui s'appelle
K-5 & Sigma 17-50mm f/2.8 EX HSM


Questions
Sur Peeper Pixel il n'y a aucune photo pleine taille avec ce nouveau 17-50 et j'ai regardé tous les sites spécialisés sur le net , impossible de trouver des éléments objectifs (sans jeux de mots)et concrets sur ce 17-50
Deuxièmement, la double stabilisation présente sur K5 et Sigma ne crée telle pas un problème de mise au point ou un risque de conflit électronique???
J'ai posé la question à Sigma France et j'attends l'information
Si de votre coté vous avez des infos merci de nous les communiquer
Cordialement
ERIC
07-07-2011, 04:51 PM   #68
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QuoteOriginally posted by eral95 Quote
[lang=fr]


Désolé mais nous sommes bien sur un post qui s'appelle
K-5 & Sigma 17-50mm f/2.8 EX HSM

Yes you're correct. My mistake.... sorry

but then that's good news as the EX should be even better

09-01-2011, 10:11 AM   #69
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Well, hate to be the bearer of bad news but I have a newish K-5 which is great with all my Pentax lenses, no problems at all, and even older non AF lenses, the focus confirmation works fine, BUT I have just bought a Sigma 17-50 which DOES give impressively sharp images, BUT it often will not focus AT ALL at longer settings than, say 35mm focal length. At 50mm it hunts and hunts without finding focus at all..... I will give it a couple of days when I have more time, but I am pretty sure it will be returned to the shop as defective.
09-01-2011, 11:41 AM   #70
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I'm sorry to hear that your Sigma is misaligned. But the warranty should clearly cover this.
09-01-2011, 09:07 PM   #71
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QuoteOriginally posted by elho_cid Quote
Sorry but that comparison is not valid. Klaus had particulary bad Da*16-50 from early production. Nowdays the Da*16-50 are far better, including better SDM drive. The CA were more pronounced on K10D than on later bodies.
My 50-500 is not very convincing, but I like my sigma 180mm macro a lot. But sigma a DC zooms I saw (the old 18-50/2,8, both the 17-70) are junk.

What utter garbage!!

I own a Sigma 17-70 DC 28-4.5. I've had it since I had my K20D and K10D. I now regularly use it with my K-5s. It's image quality is great, it's close focus ability is great and it has a very useful zoom range. I was acutally suprised at how good it is for a mid priced lens

Highly recommended
09-01-2011, 10:09 PM   #72
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QuoteOriginally posted by Smeggypants Quote
What utter garbage!!

I own a Sigma 17-70 DC 28-4.5. I've had it since I had my K20D and K10D. I now regularly use it with my K-5s. It's image quality is great, it's close focus ability is great and it has a very useful zoom range. I was acutally suprised at how good it is for a mid priced lens

Highly recommended
I would agree with you Smeggy.
I still have my copy of the Sigma 17-70 DC f2.8-4.5. It has always taken good quality photos and is excellent for the price.

Peter
09-02-2011, 08:25 AM   #73
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I use this lens (Sigma 17-50 F/2.8 EX OS HSM) probably 60% of the time on my K-5.

The lens is absolutely phenomenal; it focuses quickly and accurately under all lighting conditions that I've exposed it to (i.e. dimly lit wedding receptions, concerts, at a christening in a dark church, hiking, walking around Newport during the daytime), it's tack sharp, and I personally like the bokeh pattern. Best of all there is virtually no purple/green fringing with this lens, which annoys the ever-living hell out of me on my Pentax glass.

I use the in-body optical stabilization and turn off the Sigma OS to save battery life. The lens is well-built but you'll notice some "rattling" from it when it's not powered on due to it's OS system. This is normal per Sigma and the other users that I've spoke with.

I'll follow up with some sample photos when I get home.

-Sean
09-02-2011, 09:43 AM   #74
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I swapped the Sigma 18-50 f2.8 EX DC Macro for a DA* 16-50.

The DA* has a slight edge on sharpness and colour in the most general case - but I certainly do miss the Sigma very much and frequently recommend it to others - it was an amazing lens for the money and very versatile. One area it certainly beats the 16-50 is in close focusing ability.
09-05-2011, 12:37 PM   #75
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QuoteOriginally posted by grahamcoad Quote
Well, hate to be the bearer of bad news but I have a newish K-5 which is great with all my Pentax lenses, no problems at all, and even older non AF lenses, the focus confirmation works fine, BUT I have just bought a Sigma 17-50 which DOES give impressively sharp images, BUT it often will not focus AT ALL at longer settings than, say 35mm focal length. At 50mm it hunts and hunts without finding focus at all..... I will give it a couple of days when I have more time, but I am pretty sure it will be returned to the shop as defective.
Well, its gone off back to Sigma today for servicing or replacement under guarantee (3 year guarantee here in the UK) and a promise of a two to three week turnaround. I thought there was no point getting aerated and annoyed, even though I'm naturally grumpy to have bought a new lens and found it defective. I could have returned it to the store I bought it from, but they would only send it back to Sigma, so I thought there would be more delay that way.

Results from the lens when it DOES decide to focus properly and when manually focussed show very encouraging image quality, and that is a strong factor in staying with the Sigma.

It's ironic that i was deterred from choosing the Pentax 16-50 because of bad press about breakdowns!

I'll let you all know how I get on.
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