DFA*50 1.4 coming

deus ursus · 02-22-2018, 07:31 AM - **1 Like**

Originally posted by photoptimist

[...]
But the Pentax and Tokina seem extremely unlikely to come from the same designer given that their focus rings move in opposite directions.

Maybe they come from two brothers?

Mistral75 · 02-22-2018, 08:01 AM

Originally posted by photoptimist

(...)

But the Pentax and Tokina seem extremely unlikely to come from the same designer given that their focus rings move in opposite directions.

This is a ring ultrasonic motor and a 'focus by wire' command. It's pretty easy to program the effect of the sense of rotation, as demonstrated by the Tokina opera lens which uses one direction for the Canon mount and the opposite one for the Nikon mount to conform itself to the 'rule' followed by the respective OEM lenses.

Mistral75 · 02-22-2018, 09:27 AM

Originally posted by robjmitchell

Have we seen an optical formula for the DFA*50 yet?
I wonder if this is accurate

No optical formula has been published for the HD Pentax-D FA★ 50mm f/1.4 SDM AW yet.

Don't tell me it has 13 elements in 10 groups...

Kunzite · 02-22-2018, 09:27 AM - **1 Like**

I surely hope not - 13 brings bad luck.

**ffking** · 02-22-2018, 10:08 AM

I wonder why Pentax aren't releasing a 20mm f/2 ?

normhead · 02-22-2018, 10:12 AM

Originally posted by ffking

I wonder why Pentax aren't releasing a 20mm f/2 ?

Because they hate me.

Although I'd want an ƒ4.

Kunzite · 02-22-2018, 10:13 AM

Maybe they will - but not on Sony FE mount

By the way, the "it might be a collaboration with Tokina" is the first such supposition that actually makes sense. And not only the optics, but also the ring-type SDM motor - which might need the higher volumes to become feasible. Or not.
But, we should wait at least for detailed specs - if not confirmation.

thibs · 02-22-2018, 10:17 AM - **1 Like**

Originally posted by ffking

I wonder why Pentax aren't releasing a 20mm f/2 ?

Because that 20/2 is a mirrorless lens?

**Belnan** · 02-22-2018, 10:32 AM

Originally posted by Mistral75

Not only do the Tokina opera 50 mm f/1,4 FF and the HD Pentax-D FA★ 50 mm f/1,4 SDM AW look very similar, so do the available specifications:

【噂】トキナーが「FíRIN 20mm F2 FE AF」と「opera 50mm F1.4 FF」を近日中に発表

AF lens for full-size digital single lens reflex cameras
Mounts: Canon and Nikon
Ring-type ultrasonic motor
Dust-proof and drip-proof
First Tokina lens to adopt an electromagnetic iris system (Nikon version)
The direction of rotation of the focus ring is the same as that of a OEM lens for both Canon and Nikon mounts
Scheduled release date: Summer 2018
Should be announced on February 28.

We'll have to wait for the detailed specifications to be sure but I'm pretty certain these two lenses have a lot in common. A shared development could explain the delay since it's always more complicated when two corporations are involved in the same project.

You were the first to "speculate" that Pentax would release a 25mm, 50mm and and 85mm based on tokina's Cine lenses and I came around to that as a strong possibility. This only further cements that. If true Im only sad that now other cameras will get to have access to the same optics as Pentax users.

zapp · 02-22-2018, 10:59 AM

Originally posted by jatrax

Those who talk know nothing, those who know don't talk.

Too much camera update news and even an official announcement by Pentax with specs for K1. All that during the extended year of the primes where one woould expect lenses. This may change soon as we all now, but a sign of live would be nice.

Now even Tokina is showing a new 1.4/50 before Pentax ...

robjmitchell · 02-22-2018, 11:25 AM

Originally posted by Mistral75

No optical formula has been published for the HD Pentax-D FA★ 50mm f/1.4 SDM AW yet.

Don't tell me it has 13 elements in 10 groups...

Finally someone wants to play the guessing game!
My guess was actually 13 groups.
Now we just need a cut away of a known lens to figure out how to interpret these things.
Your guess does make much more sense than mine btw

JBox · 02-22-2018, 11:42 AM

I will re-post this since it has gone largely unnoticed. It appears that the DFA* 50 was used for some of the sample images for the K-1 II:

Originally posted by JBox

Go to the page here for K-1 II sample images. The last few images claim to have used the lens "HD PENTAX-D FA*50mmF1.4 SDM AW". Below it says: "The lens used is Beta version, and the name is tentative."

robjmitchell · 02-22-2018, 11:44 AM - **1 Like**

Ok Folks i have found the equivalent photo for the Da*55/1.4. Link to formula
smc PENTAX-DA?55mmF1.4 SDM / Telephoto Lenses / K-mount Lenses / Lenses / Products | RICOH IMAGING

So this is almost certainly and accurate representation of the DFA*50/1.4 optical formula.

Let’s get interpreting!

y0chang · 02-22-2018, 12:05 PM

If that is the actual formula for the lens, I am counting more than 14 elements...that is one complicated prime lens and definitely a unique formula...and its gonna be 1.5k lens...

**jatrax** · 02-22-2018, 12:33 PM - **1 Like**

Originally posted by zapp

during the extended year of the primes

"year of the primes" never came from Pentax. Only from a certain internet rumor source who is correct about 50% of the time. Perhaps we should pay more attention to what Pentax says than anonymous internet posters.

Remember: Those who know are not talking, those who talk do not know.

02-22-2018, 10:32 AM	#2874
Belnan Site Supporter Join Date: Jul 2010 Location: Nova Scotia Photos: Albums Posts: 1,090	Originally posted by Mistral75 Not only do the Tokina opera 50 mm f/1,4 FF and the HD Pentax-D FA★ 50 mm f/1,4 SDM AW look very similar, so do the available specifications: 【噂】トキナーが「FíRIN 20mm F2 FE AF」と「opera 50mm F1.4 FF」を近日中に発表 AF lens for full-size digital single lens reflex cameras Mounts: Canon and Nikon Ring-type ultrasonic motor Dust-proof and drip-proof First Tokina lens to adopt an electromagnetic iris system (Nikon version) The direction of rotation of the focus ring is the same as that of a OEM lens for both Canon and Nikon mounts Scheduled release date: Summer 2018 Should be announced on February 28. We'll have to wait for the detailed specifications to be sure but I'm pretty certain these two lenses have a lot in common. A shared development could explain the delay since it's always more complicated when two corporations are involved in the same project. You were the first to "speculate" that Pentax would release a 25mm, 50mm and and 85mm based on tokina's Cine lenses and I came around to that as a strong possibility. This only further cements that. If true Im only sad that now other cameras will get to have access to the same optics as Pentax users.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Diglloyd reviews DA 35, DFA 50 and DFA 100 Macro lenses on the K-1	Matchete	Pentax SLR Lens Discussion	19	06-09-2016 09:18 AM
Sigma 50/1.4 EX vs. Pentax FA 50/1.4 and DA 55/1.4	DonovanDwyer	Pentax SLR Lens Discussion	17	01-24-2014 12:54 PM
For Sale - Sold: Sigma 10-20mm/4, Pentax FA 50/1.4, DFA 100mm/2.8 Macro	Alam	Sold Items	5	11-20-2011 03:02 PM

02-22-2018, 07:31 AM - 1 Like	#2866
deus ursus Pentaxian Join Date: Nov 2012 Location: Stårheim, Norway Posts: 658	Originally posted by photoptimist [...] But the Pentax and Tokina seem extremely unlikely to come from the same designer given that their focus rings move in opposite directions. Maybe they come from two brothers?

02-22-2018, 08:01 AM	#2867
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by photoptimist (...) But the Pentax and Tokina seem extremely unlikely to come from the same designer given that their focus rings move in opposite directions. This is a ring ultrasonic motor and a 'focus by wire' command. It's pretty easy to program the effect of the sense of rotation, as demonstrated by the Tokina opera lens which uses one direction for the Canon mount and the opposite one for the Nikon mount to conform itself to the 'rule' followed by the respective OEM lenses.

02-22-2018, 09:27 AM	#2868
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by robjmitchell Have we seen an optical formula for the DFA*50 yet? I wonder if this is accurate No optical formula has been published for the HD Pentax-D FA★ 50mm f/1.4 SDM AW yet. Don't tell me it has 13 elements in 10 groups...

02-22-2018, 09:27 AM - 1 Like	#2869
Kunzite Pentaxian Join Date: Apr 2007 Location: Romania Posts: 15,132	I surely hope not - 13 brings bad luck.

02-22-2018, 10:08 AM	#2870
ffking Site Supporter Join Date: Nov 2015 Location: Old South Wales Posts: 6,038	I wonder why Pentax aren't releasing a 20mm f/2 ?

02-22-2018, 10:12 AM	#2871
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451	Originally posted by ffking I wonder why Pentax aren't releasing a 20mm f/2 ? Because they hate me. Although I'd want an ƒ4.

02-22-2018, 10:13 AM	#2872
Kunzite Pentaxian Join Date: Apr 2007 Location: Romania Posts: 15,132	Maybe they will - but not on Sony FE mount By the way, the "it might be a collaboration with Tokina" is the first such supposition that actually makes sense. And not only the optics, but also the ring-type SDM motor - which might need the higher volumes to become feasible. Or not. But, we should wait at least for detailed specs - if not confirmation.

02-22-2018, 10:17 AM - 1 Like	#2873
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by ffking I wonder why Pentax aren't releasing a 20mm f/2 ? Because that 20/2 is a mirrorless lens?

02-22-2018, 10:59 AM	#2875
zapp Pentaxian Join Date: Jul 2011 Posts: 2,385	Originally posted by jatrax Those who talk know nothing, those who know don't talk. Too much camera update news and even an official announcement by Pentax with specs for K1. All that during the extended year of the primes where one woould expect lenses. This may change soon as we all now, but a sign of live would be nice. Now even Tokina is showing a new 1.4/50 before Pentax ...

02-22-2018, 11:25 AM	#2876
robjmitchell Veteran Member Join Date: Oct 2007 Location: Melbourne Aus Posts: 1,776	Originally posted by Mistral75 No optical formula has been published for the HD Pentax-D FA★ 50mm f/1.4 SDM AW yet. Don't tell me it has 13 elements in 10 groups... Finally someone wants to play the guessing game! My guess was actually 13 groups. Now we just need a cut away of a known lens to figure out how to interpret these things. Your guess does make much more sense than mine btw

02-22-2018, 11:42 AM	#2877
JBox Senior Member Join Date: Aug 2011 Location: Michigan Posts: 109	I will re-post this since it has gone largely unnoticed. It appears that the DFA* 50 was used for some of the sample images for the K-1 II: Originally posted by JBox Go to the page here for K-1 II sample images. The last few images claim to have used the lens "HD PENTAX-D FA*50mmF1.4 SDM AW". Below it says: "The lens used is Beta version, and the name is tentative."

02-22-2018, 11:44 AM - 1 Like	#2878
robjmitchell Veteran Member Join Date: Oct 2007 Location: Melbourne Aus Posts: 1,776	Ok Folks i have found the equivalent photo for the Da55/1.4. Link to formula smc PENTAX-DA?55mmF1.4 SDM / Telephoto Lenses / K-mount Lenses / Lenses / Products \| RICOH IMAGING So this is almost certainly and accurate representation of the DFA50/1.4 optical formula. Let’s get interpreting!

02-22-2018, 12:05 PM	#2879
y0chang Veteran Member Join Date: Jan 2012 Location: United States Posts: 793	If that is the actual formula for the lens, I am counting more than 14 elements...that is one complicated prime lens and definitely a unique formula...and its gonna be 1.5k lens...

02-22-2018, 12:33 PM - 1 Like	#2880
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Originally posted by zapp during the extended year of the primes "year of the primes" never came from Pentax. Only from a certain internet rumor source who is correct about 50% of the time. Perhaps we should pay more attention to what Pentax says than anonymous internet posters. Remember: Those who know are not talking, those who talk do not know.