Opticallimits

(03-01-2018, 07:49 AM)Klaus Wrote: [ -> ]

(02-28-2018, 09:38 PM)Kunzite Wrote: [ -> ]@thxbb12:
You already have the answer: my statement was correct, and your assumption wasn't. I don't get why, when the same design is shared between Pentax and Tokina, people would assume it's Tokina's... it's not like Tokina demonstrated a higher capability of launching new lenses.

This page is an attempt to associate Pentax-designed lenses with their designers:
http://douglasviewfinder.blogspot.ro/p/k...gners.html

The reason for the assumption is simple - the Tokina/Tamron lenses were usually (always?) released earlier than the Pentax variant.

 If that is the case it's game set and match!!  

@davidmanze & thxbb12:
I'm not guessing here. I even presented proof - a webpage associating the lenses with their designers (through patents); here it is again:
http://douglasviewfinder.blogspot.ro/p/k...gners.html

As for the assumption that Tokina lenses were launched before their Pentax counterparts so they're Tokina designs:
- 100mm f/2.8 macro: Pentax in 2004, Tokina in 2006; designer MASAKAZU YAMAGATA
- 12-24 f/4: Pentax in 2005, Tokina in 2004; Tokina design
- 10-17mm fisheye: Pentax in 2005, Tokina in 2007; designer TAKAYUKI ITO+Jun Hirakawa
- 16-50 f/2.8: Pentax in 2007, Tokina in 2007; designer MASAKAZU SAORI
- 50-135 f/2.8: Pentax in 2007, Tokina in 2006; designer MASAKAZU SAORI
- 35mm f/2.8 macro: Pentax in 2008, Tokina in 2007; designer YASUO KANAZASHI+KATO KOJI

Launch dates for Pentax taken from DPReview. Launch dates for Tokina lenses taken from http://www.lensora.com/lenses.asp

I did some checking as to the release dates of the Pentax vs Tokina and effectively the 16-50mm was released first by Pentax in 2007, the Tokina in 2009......

......so I bow to your research!


Dave's clichés

15 elements... 8 in the focus group:
https://www.dpreview.com/forums/post/60851218

As someone on the forum wrote:

"It's good that Pentax are allowing Tokina to use their patent so that Canon and Nikon users can enjoy this creation."

So let's all get one!


Dave's clichés

Actually the lens represent a significant jump in lens design from Pentax....with it's complex optical formula....I'm impressed!

Pentax Forums will no doubt test the K mount version.........maybe Lenstip the Nikon or Canon version.....

......doubtless the K mount version will have excellent coatings, something that Lenstip consistently groans about with Tokina.

It's certainly more complex than the Nikon AF-S 50mm F1.8 G that I'm waiting for.... ha ho ha ho.....with it's simple(ish) 7 elements in 6 groups (1 aspheric)

At CP+ Pentax, seriously under their own named banner, were showing the new KI II with this new lens on it, they were also stating that they had another K series APSc body in design and the general flavour was optimistic.


So they seem to have plans for the future!


Dave's clichés

Pentaxforums already have a brief hands-on, with a video showcasing the focusing speed:
https://www.pentaxforums.com/articles/cp...-lens.html

No images yet - publishing them is not allowed.