D FA 21 Limited is one of the three.

offertonhatter · 07-08-2021, 04:56 PM

Still no idea on the max aperture? My HD-DA21mm works great on the K-1 but only in the square format option on the camera. Hopefully faster than F3.2 of the DA Limited, even better somewhere between F2 and F2.8.

**fs999** · 07-09-2021, 12:01 AM

Can't even remember how it looks

OoKU · 07-09-2021, 12:11 AM - **6 Likes**

Originally posted by offertonhatter

Still no idea on the max aperture? My HD-DA21mm works great on the K-1 but only in the square format option on the camera. Hopefully faster than F3.2 of the DA Limited, even better somewhere between F2 and F2.8.

Then your wish will come true.

Zygonyx · 07-09-2021, 06:23 PM

Let's make the F an integer

**SelrahCharleS** · 07-09-2021, 06:32 PM

I'm hoping for 21mm f/2.1.

**Rondec** · 07-10-2021, 03:13 AM - **1 Like**

Originally posted by offertonhatter

Still no idea on the max aperture? My HD-DA21mm works great on the K-1 but only in the square format option on the camera. Hopefully faster than F3.2 of the DA Limited, even better somewhere between F2 and F2.8.

I'm OK with f2.8. I would just like it be decent wide open. If you have to stop down to f5.6 to get border sharpness then that will be an issue.

house · 07-10-2021, 10:09 AM

Arent only the recent (mirrorless) uwa lenses sharp across the field below f4. Most older lenses have so so corners at 5.6.

My expectations arent super high considering Pentax is relatively inexperienced at making modern wide angle primes.

Kunzite · 07-10-2021, 10:56 AM - **1 Like**

Originally posted by house

Arent only the recent (mirrorless) uwa lenses sharp across the field below f4. Most older lenses have so so corners at 5.6.

My expectations arent super high considering Pentax is relatively inexperienced at making modern wide angle primes.

The mirrorless makers you're praising had zero experience at making modern mirrorless wide angle primes... how's that different from what you think about Pentax?

house · 07-10-2021, 11:06 AM

I'm not praising, its just that all recent uwa primes have been mirrorless. I've not looked into if these recent primes are the first they've done in modern times but certainly canikon has made ff uwa primes after pentax made the fa20.

I do think its difficult to stay on top with such a small number of releases. They need practice and development at all stages to improve.

Kunzite · 07-10-2021, 01:47 PM - **2 Likes**

Originally posted by house

I do think its difficult to stay on top with such a small number of releases. They need practice and development at all stages to improve.

Pentax made the D FA* primes without "practice and development at all stages".
Talk is cheap. Do you have anything to support dissing the D FA 21mm Limited before knowing anything about it?

Wheatfield · 07-10-2021, 02:49 PM - **2 Likes**

Originally posted by house

Arent only the recent (mirrorless) uwa lenses sharp across the field below f4. Most older lenses have so so corners at 5.6.

My expectations arent super high considering Pentax is relatively inexperienced at making modern wide angle primes.

They weren't experienced at making modern standard or short telephoto primes for full frame, but they managed to come up with nearly the best available in both categories.

What you are saying is that they will put their name on and release a sub standard product and call it premium.
Ricoh/Pentax is not Chevrolet.

I truly believe you are making a completely specious argument here.

house · 07-10-2021, 03:54 PM

The standards set out in the post above were quite high. Sharp across the field at relatively wide apertures. Something only the best recent uwa lenses achieve, often with significant software corrections and way larger size than the dfa21 mockups and this on short flanged mounts.

Coupled with the goals we know for ltds, the dfa21 in particular and Pentax relatively limited uwa experience in recent years those expectations are higher than mine.

texandrews · 07-10-2021, 04:35 PM - **2 Likes**

These lenses have a different philosophy behind them---unlike the recent 50 f1.4 for instance. So, I'd say expectations of clinical sharpness across the frame wide open are misplaced. I am more concerned about other things with this lens.

dbs · 07-10-2021, 05:34 PM - **3 Likes**

Mmmm interesting.
A member thinks that because Pentax release lenses at a slower pace to some others that they don't know how to make uw lenses that match the opposition.
Interesting

Secondary to that all new lenses are sharp across all the frame ( just like a macro lens ).

Dave

JPT · 07-11-2021, 12:07 AM - **1 Like**

Originally posted by texandrews

These lenses have a different philosophy behind them---unlike the recent 50 f1.4 for instance. So, I'd say expectations of clinical sharpness across the frame wide open are misplaced. I am more concerned about other things with this lens.

Agreed. It would be weird to have a Limited lens that was just designed for uniformity. These lenses are supposed to have different properties to the typical lenses.

07-10-2021, 04:35 PM - 2 Likes	#1468
texandrews Moderator Join Date: Apr 2014 Location: Baltimore Photos: Albums Posts: 3,392	Remember, it's a Limited lens These lenses have a different philosophy behind them---unlike the recent 50 f1.4 for instance. So, I'd say expectations of clinical sharpness across the frame wide open are misplaced. I am more concerned about other things with this lens.

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07-08-2021, 04:56 PM	#1456
offertonhatter Veteran Member Join Date: Jul 2007 Location: North West UK Posts: 390	Still no idea on the max aperture? My HD-DA21mm works great on the K-1 but only in the square format option on the camera. Hopefully faster than F3.2 of the DA Limited, even better somewhere between F2 and F2.8.

07-09-2021, 12:01 AM	#1457
fs999 Loyal Site Supporter Join Date: Jul 2008 Location: Luxembourg Photos: Gallery Posts: 8,638	Can't even remember how it looks

07-09-2021, 12:11 AM - 6 Likes	#1458
OoKU Pentaxian Join Date: Dec 2015 Posts: 740	Originally posted by offertonhatter Still no idea on the max aperture? My HD-DA21mm works great on the K-1 but only in the square format option on the camera. Hopefully faster than F3.2 of the DA Limited, even better somewhere between F2 and F2.8. Then your wish will come true.

07-09-2021, 06:23 PM	#1459
Zygonyx Pentaxian Join Date: Jun 2011 Location: Ile de France Posts: 4,033	Let's make the F an integer

07-09-2021, 06:32 PM	#1460
SelrahCharleS Site Supporter Join Date: Dec 2006 Location: Wisconsin, USA Posts: 935	I'm hoping for 21mm f/2.1.

07-10-2021, 03:13 AM - 1 Like	#1461
Rondec Loyal Site Supporter Join Date: Mar 2009 Location: Gladys, Virginia Photos: Gallery Posts: 27,653	Originally posted by offertonhatter Still no idea on the max aperture? My HD-DA21mm works great on the K-1 but only in the square format option on the camera. Hopefully faster than F3.2 of the DA Limited, even better somewhere between F2 and F2.8. I'm OK with f2.8. I would just like it be decent wide open. If you have to stop down to f5.6 to get border sharpness then that will be an issue.

07-10-2021, 10:09 AM	#1462
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	Arent only the recent (mirrorless) uwa lenses sharp across the field below f4. Most older lenses have so so corners at 5.6. My expectations arent super high considering Pentax is relatively inexperienced at making modern wide angle primes.

07-10-2021, 10:56 AM - 1 Like	#1463
Kunzite Pentaxian Join Date: Apr 2007 Location: Romania Posts: 15,132	Originally posted by house Arent only the recent (mirrorless) uwa lenses sharp across the field below f4. Most older lenses have so so corners at 5.6. My expectations arent super high considering Pentax is relatively inexperienced at making modern wide angle primes. The mirrorless makers you're praising had zero experience at making modern mirrorless wide angle primes... how's that different from what you think about Pentax?

07-10-2021, 11:06 AM	#1464
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	I'm not praising, its just that all recent uwa primes have been mirrorless. I've not looked into if these recent primes are the first they've done in modern times but certainly canikon has made ff uwa primes after pentax made the fa20. I do think its difficult to stay on top with such a small number of releases. They need practice and development at all stages to improve.

07-10-2021, 01:47 PM - 2 Likes	#1465
Kunzite Pentaxian Join Date: Apr 2007 Location: Romania Posts: 15,132	Originally posted by house I do think its difficult to stay on top with such a small number of releases. They need practice and development at all stages to improve. Pentax made the D FA* primes without "practice and development at all stages". Talk is cheap. Do you have anything to support dissing the D FA 21mm Limited before knowing anything about it?

07-10-2021, 02:49 PM - 2 Likes	#1466
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,981	Originally posted by house Arent only the recent (mirrorless) uwa lenses sharp across the field below f4. Most older lenses have so so corners at 5.6. My expectations arent super high considering Pentax is relatively inexperienced at making modern wide angle primes. They weren't experienced at making modern standard or short telephoto primes for full frame, but they managed to come up with nearly the best available in both categories. What you are saying is that they will put their name on and release a sub standard product and call it premium. Ricoh/Pentax is not Chevrolet. I truly believe you are making a completely specious argument here.

07-10-2021, 03:54 PM	#1467
house Pentaxian Join Date: May 2015 Photos: Albums Posts: 3,306	The standards set out in the post above were quite high. Sharp across the field at relatively wide apertures. Something only the best recent uwa lenses achieve, often with significant software corrections and way larger size than the dfa21 mockups and this on short flanged mounts. Coupled with the goals we know for ltds, the dfa21 in particular and Pentax relatively limited uwa experience in recent years those expectations are higher than mine.

07-10-2021, 05:34 PM - 3 Likes	#1469
dbs Pentaxian Join Date: Jun 2010 Location: Clare Valley S A Photos: Albums Posts: 7,563	Mmmm interesting. A member thinks that because Pentax release lenses at a slower pace to some others that they don't know how to make uw lenses that match the opposition. Interesting Secondary to that all new lenses are sharp across all the frame ( just like a macro lens ). Dave

07-11-2021, 12:07 AM - 1 Like	#1470
JPT Pentaxian Join Date: Jan 2012 Location: Tokyo Photos: Gallery Posts: 2,821	Originally posted by texandrews These lenses have a different philosophy behind them---unlike the recent 50 f1.4 for instance. So, I'd say expectations of clinical sharpness across the frame wide open are misplaced. I am more concerned about other things with this lens. Agreed. It would be weird to have a Limited lens that was just designed for uniformity. These lenses are supposed to have different properties to the typical lenses.