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05-11-2016, 12:38 PM   #136
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QuoteOriginally posted by stevebrot Quote
They make a generic lens body adaptable to multiple platforms. So, the short answer is that they make K-mount the same as they make Nikon F and Canon EF. They even provide a mount change service. Example: If you bought a lens in Canon EF that was also available in Pentax K and you later switch from Canon to Pentax, Sigma offers to change the lens over to Pentax K for a fee. That being said, whether they sell a lens in a particular mount depends on economics and cost to manufacture. For example, Sigma has complained that the KAF2 mount requires more care in manufacture due to the aperture control implementation. Nikon presents similar manufacturing challenges, but sales volume makes up for the trouble. K-mount sales volume is a bit less spectacular and less worthy of the resources to make/sell (poor ROI).

Another consideration is projected penetration where a market segment is contested. Up until recently Sigma sold their 70-200/2.8 in K-mount where it was considered to be the upscale and better-performing competition to the Tamron product. Judging from posts on this site, that lens has seen reasonable sales success among Pentaxians. About the same time that Pentax confirmed FF camera development as well as a 70-200 lens to complement the camera, Sigma pulled its offering from the market knowing that they would likely see a sales drop of at least 30% with release of the new lens. Will they offer their 70-200/2.8 again? I guess it depends on the strength of the K-mount FF market going forward.


Steve
Aw, shucks! You got me quoted before I deleted the pants line.

Anyway, thanks for the reply!

05-11-2016, 12:38 PM - 1 Like   #137
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QuoteOriginally posted by Parallax Quote
Okay, but how much will they lose due to people buying the Sigma lenses instead of Pentax lenses?
I have no idea. I do know one of the major knocks against the K-1 I have heard from non-Pentax users is the lack of super high resolving, fast primes. Sigma seems to have that covered with the Art line. Pentax really offers nothing at 1.4. I do suspect we might eventually see Pentax branded versions of the newer Tamron primes, though they are not 1.4's like the Art line. As good as the FA Limited's are, they do show their age with regard to CA, aberrations and sharpness until stopped down a bit - and, of course, they are not 1.4's nor do they have internal, modern AF.
05-11-2016, 12:39 PM   #138
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So much bluster in here about not much of an issue.

Sigma said, "We are planning to provide a repair service for this issue." I think that is great of Sigma do commit to a fix so quickly, before most of us even knew there was an issue. Kudos to Sigma for that.
05-11-2016, 12:39 PM   #139
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Maybe Sigma makes company safe from complaints of users...? Some lenses from this list work fine with K-1...

05-11-2016, 12:42 PM - 1 Like   #140
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QuoteOriginally posted by Quartermaster James Quote
Aw, shucks! You got me quoted before I deleted the pants line.

Anyway, thanks for the reply!
That is why it is better to use strikeout and add a little sheepish grin




Steve

(...I hate it when I get quoted before I edit... )

Last edited by stevebrot; 05-11-2016 at 12:53 PM.
05-11-2016, 12:52 PM - 1 Like   #141
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QuoteOriginally posted by jake14mw Quote
Sigma said, "We are planning to provide a repair service for this issue." I think that is great of Sigma do commit to a fix so quickly, before most of us even knew there was an issue. Kudos to Sigma for that.
Thank you for saying this. Several of the affected lenses have been out of production for a few years. Sigma could just suggest to their installed base that they tough up and move on, yet they instead opted to do well with their customers and the market in general. They pushed the limits of what, in light of historic norms, constitutes a compatible mount and sort of got caught short as a new Pentax model came to market. It could have just as easily been Nikon or Canon.


Steve
05-11-2016, 01:48 PM   #142
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QuoteOriginally posted by jake14mw Quote
So much bluster in here about not much of an issue.

Sigma said, "We are planning to provide a repair service for this issue." I think that is great of Sigma do commit to a fix so quickly, before most of us even knew there was an issue. Kudos to Sigma for that.
Guilty as charged, and I don't even have a K-1.
05-11-2016, 01:52 PM   #143
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QuoteOriginally posted by stevebrot Quote
Several of the affected lenses are current production with life spans overlapping the K-1 design cycle. What is possible is that Pentax did due diligence with those lenses, but Sigma made a recent change in their manufacturing. For the non-current product, Pentax should have known that the installed user base was significant.


Steve
Is the installed user base significant? Do you or I really know that? Sigma doesn't seem to think so.

Should Pentax choose to violate its own, published standard to accommodate users who've bought lenses from a hostile competitor that do not comply with the very design standard?

While I am personally empathetic, I don't think Pentax is responsible to design around Sigma's sloppy engineering.

05-11-2016, 01:54 PM   #144
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QuoteOriginally posted by tariq Quote
In some cases they do. I know a few folks who have considered buying the K-1 because Sigma offers the Art 35/1.4 in Pentax mount. There is not a great Pentax offering in a 35/1.4 and if that is ones main focal length of choice, the availability of the Sigma option most certainly could make Pentax some $$ via the sell of a K-1 (and possibly other Pentax lenses and future bodies down the road thereafter).
Technically you can get any new Sigma lens remounted on K-Mount for a fee.

Call it a Pen-Tax.
05-11-2016, 02:08 PM   #145
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QuoteOriginally posted by Na Horuk Quote
Ah, that explains it (check the original post, as the quote is missing the photo)
Its really too bad that after the K-30 this issue wasn't thought about more, by Ricoh and Sigma.
I assume a fix is coming soon from Sigma, and hopefully the K-1II will have a steeper angle around the mount.

I assume this might also cause trouble for mirror lenses and possible some T/S lenses at maximum shift.
Stay safe, everyone


I have and Opteka 500mm mirror lens and it fits with no issues at all. It has plenty of clearance.
05-11-2016, 02:19 PM   #146
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QuoteOriginally posted by kvetcha Quote
Technically you can get any new Sigma lens remounted on K-Mount for a fee.

Call it a Pen-Tax.
Only if Sigma already makes that lens in K-mount. And most Sigma lenses aren't.
05-11-2016, 02:25 PM   #147
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QuoteOriginally posted by monochrome Quote
Should Pentax choose to violate its own, published standard
This is the part that I find puzzling. What is this published standard and where can I read it?

Near I can tell, the 65mm clearance "standard" that surfaced in this thread was broken at least once by Pentax itself in the design of my Super Program. That being said, it was pretty cheeky of Sigma to make lenses whose mount design was clearly outside accepted practice for Pentax-K. Ricoh, for its part could easily have done a survey of lens physical compatibility during its first round of alpha testing as part of due diligence. Regardless of where the blame might be placed, Sigma has stepped up to the plate and has offered to modify the affected lenses.


Steve
05-11-2016, 02:36 PM   #148
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QuoteOriginally posted by kvetcha Quote
Technically you can get any new Sigma lens remounted on K-Mount for a fee.

Call it a Pen-Tax.
I wish. I have a great Sigma Art 24/1.4 that I would love to use on my K-1. That will not be possible unless Sigma offers this lens in Pentax KA mount. IF/ when this lens is made available in Pentax mount, I will gladly pay the $250 or so fee to have the mount changed by Sigma.
05-11-2016, 02:36 PM - 1 Like   #149
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dcshooter has a post on another thread about the public (and private) K-mount spec., which has never, ever changed. Apparently the spec. Includes a MINIMUM clearance standard above the mount itself, which these Sigma lenses violate by 3-5mm. K-1 clearance is apparently more than the minimum, but does not accommodate the largest of the Sigma mounts (up to 65.2mm vs 58.5 standard). According to Brian, Ricoh did leave some room - just not quite enough for these specific lenses.

Our Superprograms have more clearance than the minimum K-mount standard, even though they look different from an LX or K10 or something else.

I can't get my brain around the idea that Ricoh 'should' have done anything. By that standard they 'should' have designed around the Ricoh Pin and the Vivitar flange, right?

Last edited by monochrome; 05-11-2016 at 02:42 PM.
05-11-2016, 02:54 PM   #150
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I have tried my Sigma 70-200 OS today, and it is flush, but did not scratch the K-1 ....
But it is VERY close...
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