I suspect that there are two reasons why it became easier to design these
ultra-wides:
1. New glass material with a higher refractive index, and
2. Computerized design (possibly some optical CAD package?) where you can
model what you get without actually building the lens.
I would be curious to see what type of software they actually use.
Igor
Sent from mobile phone
P.J. Alling Sun, 20 Mar 2016 10:08:03 -0700 wrote:
I don't know there seem to be a plethora for new Ultra Wide, 14-15mm, Full
Frame 35mm lenses. From Samyang, with it's multiple re-brands and and it's
various iterations to the Zeiss 15mm Distagon, all of them seem to be
manual focus, which doesn't seem like a big deal since at f4everything is
in focus from 4 feet to infinity. Funny thing is that at one time a 14-15mm
lens for 35mm format wasdifficult to get right. Today, the Samyang at about
1/10 the cost ofthe Zeise seems to be optically almost it's equal, and both
are just amazingly good.
On March 20, 2016 11:49:10 AM Igor PDML-StR <[email protected]> wrote:
But it is weightless with P-K. :-)
It looks interesting, even though it is MF. Is something known about this
brand/design (beyond what's written on this website)?
What would make it competitive to Samyang/Rokinon 14/2.8?
It's half a step(stop) faster. They've got some accessories...
In any case, it's nice (for Pentax line) they are going to make it in
K-mount.
Igor
Steve Cottrell Sun, 20 Mar 2016 09:23:13 -0700 wrote:
On 20/3/16, Mark Roberts, discombobulated, unleashed:
That's a 1958 Pentax K screw-mount. Definitely full-frame 35mm ;-)
Then you might want a new full-frame lens for it. Interestingly this new
15mm/2.4 from Irix comes in a PK mount......
<http://irixlens.com/presscentre.php>
Might even work on a Pentax full frame digital camera. That is if they
ever sell one....
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