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05-16-2016, 05:37 AM - 3 Likes   #301
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Is this a Pentax problem? To me it is a no and yes answer. No it is not Pentax's problem in the "legal" sense but it is a Pentax problem since Sigma produces many lenses that fill the gap in the Pentax lens lineup. So Pentax suffers when new customers look to buy Pentax and a leading supplier of third party lenses, with offerings that plug many Pentax gaps, issues a warning about compatibility with the Pentax K1. In terms of sales I am guessing Pentax users who want a full frame camera will get the K1 with this issue unresolved. In terms of attracting new customers my guess is that this issue is more damaging to Pentax than to Sigma. I sense this may be an unfortunate and unintended consequence of an angular design by Pentax.

05-16-2016, 06:15 AM   #302
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QuoteOriginally posted by RockvilleBob Quote
Is this a Pentax problem? To me it is a no and yes answer. No it is not Pentax's problem in the "legal" sense but it is a Pentax problem since Sigma produces many lenses that fill the gap in the Pentax lens lineup. So Pentax suffers when new customers look to buy Pentax and a leading supplier of third party lenses, with offerings that plug many Pentax gaps, issues a warning about compatibility with the Pentax K1. In terms of sales I am guessing Pentax users who want a full frame camera will get the K1 with this issue unresolved. In terms of attracting new customers my guess is that this issue is more damaging to Pentax than to Sigma. I sense this may be an unfortunate and unintended consequence of an angular design by Pentax.
But there has been an announced fix by Sigma - so everyone will know it's Sigma's fault... and the fix means that the problem is temporary anyway. I can't really see this harming Pentax sales significantly.
05-16-2016, 06:21 AM   #303
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Is it Pentax's fault or is it Sigma's fault? As far as I'm concerned, it really doesn't matter. The important thing is it should be resolved.

Just my thoughts. Their will be people who will use third party lenses for whatever reason they have. Sigma I believe has offered a solution and I don't know how they'll do it. As far as I can see, the lesser the availability of third party lenses and accessories, sales of cameras also decreases.
05-18-2016, 06:24 AM   #304
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FWIW, today I tested two Sigma lenses of mine (Sigma 35 f1.4 A, and the old Sigma 70-200 f2.8 HSM II) on two different K-1's. Both lenses are mentioned as 'K-1 problem lenses' in the Sigma press release.

On both the K-1's I tested, both lenses:

(a) mounted cleanly (without obstruction or hitting the camera body);
(b) worked fine in all camera modes without any issues.

This was good news for me, but it leaves me puzzled about why some camera/lens combinations have problems - particularly physical problems related to dimensions - and others don't. Manufacturing variation? Or [speculatively] has Pentax recently added 1mm or so to the distance the K-mount protrudes forward from the K-1 body, thereby giving problem Sigma lenses a bit more room away from the body?


Last edited by rawr; 05-18-2016 at 04:08 PM. Reason: typo
05-18-2016, 06:52 AM   #305
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QuoteOriginally posted by rawr Quote
FWIW, today I tested two Sigma lenses of mine (Sigma 35 f1.4 C, and the old Sigma 70-200 f2.8 HSM II) on two different K-1's. Both lenses are mentioned as 'K-1 problem lenses' in the Sigma press release.

On both the K-1's I tested, both lenses:

(a) mounted cleanly (without obstruction or hitting the camera body);
(b) worked fine in all camera modes without any issues.

This was good news for me, but it leaves me puzzled about why some camera/lens combinations have problems - particularly physical problems related to dimensions - and others don't. Manufacturing variation? Or [speculatively] has Pentax recently added 1mm or so to the distance the K-mount protrudes forward from the K-1 body, thereby giving problem Sigma lenses a bit more room away from the body?
Very interesting and perplexing, the mount height can't change, it's the most critical dimension, all they can do is to add clearance to the angled area above the mount. Potentially Sigma have had various mounts as variations along production of certain lenses. I know that they have pretty good records as I enquired about re-flashing one of my Sigma lenses and it fell outside the serial range where that was possible for that model

Cheers,
05-18-2016, 07:35 AM   #306
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And what about the freezing with the 150-500mm APO DG HSM ?
05-18-2016, 01:55 PM   #307
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Another reason to stick to Pentax lenses.
05-18-2016, 02:47 PM   #308
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IMHO it's no one's fault - Sigma don't know what Pentax will release in the future and vice-versa. Stuff happens


Last edited by BigMackCam; 05-18-2016 at 03:19 PM. Reason: Masked vulgarity.
05-18-2016, 03:29 PM - 1 Like   #309
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QuoteOriginally posted by Pål Jensen Quote
Another reason to stick to Pentax lenses.
True BUT the Pentax offering in telephoto lenses has been paltry until the 150-450. Almost nothing above 300 for some time. For several years the only long lens solution for Pentax users was Sigma Zooms and Sigma Primes.

The Pentax telephoto line is still fairly sparse. It would be nice if Pentax introduced a modernized version of the F/FA 600 f4 with modern FL and ED glass and fast focus motors or a 400 f2.8

In my case I have the Sigma 150-500 and the Sigma 70-200 - Pentax had nothing in those ranges for a long time. To not have them not work with new Pentax cameras is an issue for me and a disappointment. I have to wonder why they work on both my K5 and K3 but do not work with the K1. This issue makes buying the K1 a very, very large hurdle.
05-18-2016, 04:27 PM   #310
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QuoteOriginally posted by RockvilleBob Quote
For several years the only long lens solution for Pentax users was Sigma Zooms and Sigma Primes.
Very true. It's been great for Pentax to have Sigma around. It still is. They are a valuable partner in the Pentax ecosystem.

QuoteOriginally posted by RockvilleBob Quote
To not have them not work with new Pentax cameras is an issue for me and a disappointment.
If in doubt, I suggest checking your lenses on a K-1. As was the case with my Sigma 70-200 HSM II, the reported problems on K-1 did not materialize.
05-18-2016, 05:07 PM   #311
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QuoteOriginally posted by rawr Quote
Very true. It's been great for Pentax to have Sigma around. It still is. They are a valuable partner in the Pentax ecosystem.


If in doubt, I suggest checking your lenses on a K-1. As was the case with my Sigma 70-200 HSM II, the reported problems on K-1 did not materialize.


Sigma has all but abandoned the Pentax system. In their current lineup they have only a couple of K-mount products.
05-18-2016, 05:18 PM   #312
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QuoteOriginally posted by Pål Jensen Quote
Another reason to stick to Pentax lenses.
Except for my Sigma 10-20 mm all my lenses are Pentax. Sticking the original brand is much better than the alternative. However, a camera company cannot isolate itself when it comes to business. The more third party accessories available the more demand will be created for camera bodies. Among the big names in third party lens manufacturers, Sigma is currently the only one that makes lenses for the k-mount. If Sigma will no longer make lenses for Pentax I'm sure there will be a drop in the demand for Pentax cameras. I'm thankful that Sigma still makes lenses for the k-mount.
05-18-2016, 05:24 PM   #313
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QuoteOriginally posted by dakight Quote
Sigma has all but abandoned the Pentax system. In their current lineup they have only a couple of K-mount products.
From what I can tell, they have kept their K-mount lineup alive, mainly in APS-C - as recently as 2014, for eg, they added the 18-300 and 18-200, and stores still seem to have the 18-35 f1.8, 17-70, 18-250 in APS-C, plus the FF 35 f1.4 and 500 f4.5 in stock. While not all of their newer high-end FF lenses have been released in Pentax, they still seem to have a stake in Pentax.
05-19-2016, 01:35 AM   #314
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My simple wish is that Sigma release their 20/1.4 ART in K-mount.
05-19-2016, 03:20 AM   #315
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Pentax needs Sigma more than Sigma needs Pentax. Let's hope the K1 and future cameras make the relationship more mutual.
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