Well, Tokina had an agreement with Hoya to co-develop lenses and not
produce any in K mount. Tamron currently has such an agreement with
Ricoh. Sigma doesn't, but they made noises several years ago about how
difficult it was to engineer lenses for multiple incompatible lens mounts.
I suspect that part of Ricohs introduction of an almost fully electronic
mount, (KAF4), was to make it more attractive for Sigma to build
compatible lenses.
If so, it looks like that certainly worked out well.
On 9/9/2019 4:10 PM, Igor PDML-StR wrote:
Pentax Rumors has posted an information that Sigma will stop making
lenses for Pentax K-mount, quoting Sigma's FB post in Czech:
https://pentaxrumors.com/2019/09/06/sigma-to-stop-making-lenses-for-pentax-k-mount/
If that's true, it is rather unfortunate for the Pentax community:
1. Those people who enjoy Sigma lenses, will not have that option
available any more.
2. Even if you don't like Sigma lenses, this would also mean reduced
competition for Pentax lenses. That means somewhat less pressure
for Pentax to innovate, and probably higher prices for Pentax lenses.
Now, that Tokina and Sigma are out, who's left? Tamron?
There are some non-AF lenses from other manufacturers, but that is a
different market niche.
In any case, - if you were considering buying some Sigma lens, you
probably shouldn't wait too long.
Cheers,
Igor
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