D FA 21 Limited is one of the three.

**fs999** · 04-09-2021, 05:44 AM - **1 Like**

F2. F2. F2 !

bertwert · 04-09-2021, 06:25 AM - **1 Like**

Originally posted by bertwert

With all this talk of mathematical aperture sizes again, I'm just going to refer to my prediction from fifty pages back.

mtkeller · 04-09-2021, 06:51 AM - **1 Like**

Originally posted by bertwert

With all this talk of mathematical aperture sizes again, I'm just going to refer to my prediction from fifty pages back.

Bonus points for your answer being given in Computer Modern Roman font!

BarneyL · 04-09-2021, 07:07 AM

Originally posted by beholder3

Size is relative to flange distance versus focal length.

So unless you can present an autofocussing Sony 49mm F2 that is smaller than the small version of the DA 40 limited you compare apples to oranges.

Not sure how much the flange distance is relevant here. Nikon's ultra short flange distance 20mm 1.8 for Z mount is bigger and heavier than its F mount counterpart.

By the way, I own Zeiss 21mm 2.8 and that's pretty big chunk of glass with 82mm filter thread. If that's representative for the parameters, then DFA 21 should be much slower than that.

I will consider buying DFA 21 only if it's at least a stop faster than the Zeiss and has low coma wide open. I don't think that's going to happen, since Limiteds aren't about aberration correction but the so-called je ne sais quoi; however, I wouldn't mind a surprise.

Last edited by BarneyL; 04-09-2021 at 07:18 AM.

bertwert · 04-09-2021, 07:09 AM - **1 Like**

Originally posted by mtkeller

Bonus points for your answer being given in Computer Modern Roman font!

It's a beautiful font and a pleasure to read!

Also, as a current undergrad student, I'll say that writing reports and papers with TeX makes them stand out (in a good way

).

Smolk · 04-09-2021, 08:08 AM - **1 Like**

Originally posted by bertwert

It's a beautiful font and a pleasure to read!

Also, as a current undergrad student, I'll say that writing reports and papers with TeX makes them stand out (in a good way

).

I much prefer Scala in XeLaTeX.
And I stick to my old prediction: 2.1

**Serkevan** · 04-09-2021, 08:12 AM - **2 Likes**

Originally posted by BarneyL

I will consider buying DFA 21 only if it's at least a stop faster than the Zeiss and has low coma wide open.

You can probably already skip the wait

Sandy Hancock · 04-09-2021, 03:02 PM

Originally posted by fs999

F2. F2. F2 !

Do you think saying it loudly and often will make it more likely, or do you know something?

Tesla · 04-09-2021, 03:16 PM

Originally posted by Smolk

I much prefer Scala in XeLaTeX.
And I stick to my old prediction: 2.1

I like! 2.1 and 21mm

I'm guessing f1.8

repaap · 04-09-2021, 09:54 PM

How about f 2,3? It would make nice 21/2,3

wkraus · 04-10-2021, 02:42 AM

Originally posted by repaap

How about f 2,3? It would make nice 21/2,3

While I would welcome f/2 or even f/1.8, f/2.3 would make a nice historical reference. If my research is correct, the Auto-Takumar 35mm f/2.3 (1959) was the first fast SLR 35mm lens (after the pioneering Angenieux 35mm f/2.5 Type R1 Retrofocus from 1950, the first SLR retrofocus lens). As far as f/2 versions are concerned, Konica apparently was the first in 1960 (?), followed by Asahi Optical in 1963, Nikon and Zeiss (Contarex) in 1965, Leica (R) in 1970 and Canon (FD) in 1971.

**fs999** · 04-10-2021, 03:32 AM - **1 Like**

Originally posted by Sandy Hancock

Do you think saying it loudly and often will make it more likely, or do you know something?

If Ricoh google "DFA 21mm" they will find my post

**robbiec** · 04-10-2021, 04:01 AM - **2 Likes**

I love the wait and suspense factor that Pentax give us with every new lens. A couple of observations, those saying that the amount of releases is too slow are not getting the point, Pentax are now guiding us into running dual systems, APSC and FF and that costs us money. Look at poor Sandy, he has to buy a K3 iii, DA*16-50PLM and the 21 Limited this year and that's on top of the DFA*85 last year

, the point I'm making is that Pentax are dropping the new stuff in manageable amounts - I'll be getting the K-3 iii and my 5yo daughter has my original K-3 (I could sell it on and get a couple of hundred for it but the enjoyment she gets out having her own camera completely outweighs that).
Pentax have also delayed stuff for last minute tweaks (DFA*70-200) and I cannot find anything optically in the DFA*'s that has me looking or feeling sorry for myself and that another brand has something better, its a complete fallacy if you think otherwise. I have already stated that I think the DA*16-50 might be the sleeper of the 3 taking into account flexibility, size, speed and just the overall ability to allow you frame a shot.
The 21, I think Pentax are being extra careful with this one, as the FA Limited's are a Halo brand within the Pentax ecosystem and the rendering that this lens has to deliver is weighted towards an excellent sensory experience over the possibly easier numerical excellence that a DFA* is expected to deliver, all the while having a smallish form factor, built in motor, resolution and silken smooth transition to OOF. This is not a Fuji or Sony lens that has to be corrected in camera but a lens that will salute its peers from Leica & Zeiss. Make no mistake, Pentax has left the mass market and is now rejoining its erstwhile competition. Leica has the dentists, Pentax wants the doctors ��

Zygonyx · 04-10-2021, 04:30 AM - **2 Likes**

Still, no LBA vaccine in sight

**TwoUptons** · 04-10-2021, 04:34 AM

Originally posted by robbiec

...Make no mistake, Pentax has left the mass market and is now rejoining its erstwhile competition. Leica has the dentists, Pentax wants the doctors ��

Pentax used to sell a lot of cameras to doctors, but I think they left that part of the brand with Hoya when Ricoh bought the part we use...

I hope they don’t go full-on Leica/Zeiss, as even some of us who can call ourselves doctor can’t afford that...

-Eric

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04-09-2021, 05:44 AM - 1 Like	#1261
fs999 Loyal Site Supporter Join Date: Jul 2008 Location: Luxembourg Photos: Gallery Posts: 8,645	F2. F2. F2 !

04-09-2021, 06:25 AM - 1 Like	#1262
bertwert Veteran Member Join Date: Jun 2015 Location: Golden, BC Posts: 15,172	Originally posted by bertwert With all this talk of mathematical aperture sizes again, I'm just going to refer to my prediction from fifty pages back.

04-09-2021, 06:51 AM - 1 Like	#1263
mtkeller Veteran Member Join Date: Feb 2019 Location: Sioux City, IA Photos: Gallery Posts: 938	Originally posted by bertwert With all this talk of mathematical aperture sizes again, I'm just going to refer to my prediction from fifty pages back. Bonus points for your answer being given in Computer Modern Roman font!

04-09-2021, 07:07 AM	#1264
BarneyL Pentaxian Join Date: Feb 2017 Posts: 899	Originally posted by beholder3 Size is relative to flange distance versus focal length. So unless you can present an autofocussing Sony 49mm F2 that is smaller than the small version of the DA 40 limited you compare apples to oranges. Not sure how much the flange distance is relevant here. Nikon's ultra short flange distance 20mm 1.8 for Z mount is bigger and heavier than its F mount counterpart. By the way, I own Zeiss 21mm 2.8 and that's pretty big chunk of glass with 82mm filter thread. If that's representative for the parameters, then DFA 21 should be much slower than that. I will consider buying DFA 21 only if it's at least a stop faster than the Zeiss and has low coma wide open. I don't think that's going to happen, since Limiteds aren't about aberration correction but the so-called je ne sais quoi; however, I wouldn't mind a surprise. Last edited by BarneyL; 04-09-2021 at 07:18 AM.

04-09-2021, 07:09 AM - 1 Like	#1265
bertwert Veteran Member Join Date: Jun 2015 Location: Golden, BC Posts: 15,172	Originally posted by mtkeller Bonus points for your answer being given in Computer Modern Roman font! It's a beautiful font and a pleasure to read! Also, as a current undergrad student, I'll say that writing reports and papers with TeX makes them stand out (in a good way ).

04-09-2021, 08:08 AM - 1 Like	#1266
Smolk Pentaxian Join Date: Feb 2010 Location: Eerbeek Photos: Gallery \| Albums Posts: 1,857	Originally posted by bertwert It's a beautiful font and a pleasure to read! Also, as a current undergrad student, I'll say that writing reports and papers with TeX makes them stand out (in a good way ). I much prefer Scala in XeLaTeX. And I stick to my old prediction: 2.1

04-09-2021, 08:12 AM - 2 Likes	#1267
Serkevan Site Supporter Join Date: May 2019 Photos: Albums Posts: 5,976	Originally posted by BarneyL I will consider buying DFA 21 only if it's at least a stop faster than the Zeiss and has low coma wide open. You can probably already skip the wait

04-09-2021, 03:02 PM	#1268
Sandy Hancock Moderator Site Supporter Join Date: Feb 2012 Location: Adelaide Hills, South Australia Photos: Gallery \| Albums Posts: 11,275	Originally posted by fs999 F2. F2. F2 ! Do you think saying it loudly and often will make it more likely, or do you know something?

04-09-2021, 03:16 PM	#1269
Tesla Pentaxian Join Date: Mar 2013 Location: Washington State Posts: 589	Originally posted by Smolk I much prefer Scala in XeLaTeX. And I stick to my old prediction: 2.1 I like! 2.1 and 21mm I'm guessing f1.8

04-09-2021, 09:54 PM	#1270
repaap Pentaxian Join Date: Oct 2010 Photos: Gallery \| Albums Posts: 6,242	How about f 2,3? It would make nice 21/2,3

04-10-2021, 02:42 AM	#1271
wkraus Pentaxian Join Date: Jan 2013 Location: Near Vienna, Austria Photos: Gallery Posts: 2,065	Originally posted by repaap How about f 2,3? It would make nice 21/2,3 While I would welcome f/2 or even f/1.8, f/2.3 would make a nice historical reference. If my research is correct, the Auto-Takumar 35mm f/2.3 (1959) was the first fast SLR 35mm lens (after the pioneering Angenieux 35mm f/2.5 Type R1 Retrofocus from 1950, the first SLR retrofocus lens). As far as f/2 versions are concerned, Konica apparently was the first in 1960 (?), followed by Asahi Optical in 1963, Nikon and Zeiss (Contarex) in 1965, Leica (R) in 1970 and Canon (FD) in 1971.

04-10-2021, 03:32 AM - 1 Like	#1272
fs999 Loyal Site Supporter Join Date: Jul 2008 Location: Luxembourg Photos: Gallery Posts: 8,645	Originally posted by Sandy Hancock Do you think saying it loudly and often will make it more likely, or do you know something? If Ricoh google "DFA 21mm" they will find my post

04-10-2021, 04:01 AM - 2 Likes	#1273
robbiec Site Supporter Join Date: Feb 2009 Location: Cork Photos: Albums Posts: 1,882	I love the wait and suspense factor that Pentax give us with every new lens. A couple of observations, those saying that the amount of releases is too slow are not getting the point, Pentax are now guiding us into running dual systems, APSC and FF and that costs us money. Look at poor Sandy, he has to buy a K3 iii, DA16-50PLM and the 21 Limited this year and that's on top of the DFA85 last year , the point I'm making is that Pentax are dropping the new stuff in manageable amounts - I'll be getting the K-3 iii and my 5yo daughter has my original K-3 (I could sell it on and get a couple of hundred for it but the enjoyment she gets out having her own camera completely outweighs that). Pentax have also delayed stuff for last minute tweaks (DFA70-200) and I cannot find anything optically in the DFA's that has me looking or feeling sorry for myself and that another brand has something better, its a complete fallacy if you think otherwise. I have already stated that I think the DA16-50 might be the sleeper of the 3 taking into account flexibility, size, speed and just the overall ability to allow you frame a shot. The 21, I think Pentax are being extra careful with this one, as the FA Limited's are a Halo brand within the Pentax ecosystem and the rendering that this lens has to deliver is weighted towards an excellent sensory experience over the possibly easier numerical excellence that a DFA is expected to deliver, all the while having a smallish form factor, built in motor, resolution and silken smooth transition to OOF. This is not a Fuji or Sony lens that has to be corrected in camera but a lens that will salute its peers from Leica & Zeiss. Make no mistake, Pentax has left the mass market and is now rejoining its erstwhile competition. Leica has the dentists, Pentax wants the doctors ��

04-10-2021, 04:30 AM - 2 Likes	#1274
Zygonyx Pentaxian Join Date: Jun 2011 Location: Ile de France Posts: 4,033	Still, no LBA vaccine in sight

04-10-2021, 04:34 AM	#1275
TwoUptons Loyal Site Supporter Join Date: Nov 2015 Photos: Albums Posts: 4,223	Originally posted by robbiec ...Make no mistake, Pentax has left the mass market and is now rejoining its erstwhile competition. Leica has the dentists, Pentax wants the doctors �� Pentax used to sell a lot of cameras to doctors, but I think they left that part of the brand with Hoya when Ricoh bought the part we use... I hope they don’t go full-on Leica/Zeiss, as even some of us who can call ourselves doctor can’t afford that... -Eric