New Ultra-Wide lens for Pentax FF...

Mistral75 · 03-10-2022, 08:46 AM - **4 Likes**

TH Swiss AG just announced the Irix 21mm f/1.4 Dragonfly, an ultra-wide angle prime lens covering the 24x36 image circle and available in particular in Pentax K mount:

https://irixlens.com/photo-lenses/21mm/

€795.

mtgmansf · 03-10-2022, 08:48 AM - **4 Likes**

Irix has just produced a low-cost, ultra-wide for Pentax with a great, wide aperture:

Obiektyw Irix 21mm f/1.4 Dragonfly for Pentax

might be a great lens for astro at f1.4.

Pros: Weather-sealed, wide aperture, and inexpensive.

Cons: Heavy and not yet tested. Probably cannot take front filters.

LennyBloke · 03-10-2022, 08:54 AM - **3 Likes**

Great to have some choice (and competition) - it'll be interesting to see how it stands up against the D FA* 21mm f2.4

thanks for sharing

**acoufap** · 03-10-2022, 09:01 AM

Interesting new but heavy option, fast, no filter thread, wr, auto exposure mode and exif data support, not too expensive. Nice. Thanks for the info!

**lmd91343** · 03-10-2022, 09:16 AM

Only $906.30! With TWO lens hoods.

Unfortunately no fstop markings for DOF focusing. The Irix 11 has that, as does every Takumar. Important for WA lenses.

Are the two lens hoods for aps and full frame use?

I think I'll continue to use my SMC Tak 20, Samyang 20, and 21 DA Limited instead.

JohnMc · 03-10-2022, 09:26 AM - **2 Likes**

Originally posted by lmd91343

Only $906.30! With TWO lens hoods.

Two? well that explains the 30¢

Mistral75 · 03-10-2022, 09:29 AM

24x36 image circle
15 elements in 11 groups, including 4 elements made of low-dispersion ED glass, 4 elements made of high-refractive HR glass and 2 aspherical elements
11 rounded diaphragm blades
electronic controls allowing you to control the aperture from the camera and record EXIF data
manual focus, internal
focus ring rotation: 140°
focus lock
minimum focusing distance: 30 cm
weather resistant (four gaskets including a bayonet one)
dimensions: 95mm (maximum diameter) x 99mm to 103mm (length, depending on the mount)
weight: 816g to 830g depending on the mount
available in Canon EF, Nikon F and Pentax K mounts

texandrews · 03-10-2022, 09:32 AM

This was showing as a cine lens, and on the U.S. site it is listed as T1.5 (?). So, for stills I'd say the DFA 21 is going to be the better bet, since it will have AF. Also, currently lists for $1,195usd

texandrews · 03-10-2022, 09:39 AM - **2 Likes**

Two threads on this, so I merged them.

**acoufap** · 03-10-2022, 09:40 AM

Minimum focusing distance 30cm. So for short distances there’s a clear advantage for the DFA21 and it‘s around half the weight.

Mistral75 · 03-10-2022, 09:41 AM

Originally posted by texandrews

Two threads on this, so I merged them.

Thank you. You might combine the titles too: "Irix 21mm f/1.4 Dragonfly, a New Ultra-Wide Lens for Pentax FF" or New Ultra-Wide Lens for Pentax FF: Irix 21mm f/1.4 Dragonfly".

Mistral75 · 03-10-2022, 09:44 AM

Originally posted by texandrews

This was showing as a cine lens, and on the U.S. site it is listed as T1.5 (?). So, for stills I'd say the DFA 21 is going to be the better bet, since it will have AF. Also, currently lists for $1,195usd

They first announced a cine T/1.5 version back in January and today the still f/1.4 version.

Here below what I wrote in January:

Originally posted by Mistral75

I won't open a new, dedicated thread since this is neither Pentax-related news, nor a rumour, but an educated guess.

TH Swiss AG just announced a new lens, the Irix Cine 21mm T/1.5: https://irixlens.com/cine-lenses/21mm/

The announcement of the Irix 21mm f/1.4 Dragonfly in a few months is therefore to be expected. Like the five Irix lenses currently in TH Swiss AG's portfolio (11mm f/4 - 15mm f/2.4 - 30mm f/1.4 - 45mm f/1.4 - 150mm f/2.8 Macro) this Irix 21mm f/1.4 should be available in Pentax KA mount.

BarneyL · 03-10-2022, 09:47 AM

Originally posted by acoufap

Minimum focusing distance 30cm. So for short distances there’s a clear advantage for the DFA21 and it‘s around half the weight.

Well, the DFA is more than a stop slower, so that's no surprise it weighs much less...

Looks like pretty good astro-landscape lens. A welcome option, since DFA 21 limited is a lens designed with specific purpose, not an all round super wide.

**acoufap** · 03-10-2022, 09:49 AM

Originally posted by BarneyL

Well, the DFA is more than a stop slower, so that's no surprise it weighs much less...

Looks like pretty good astro-landscape lens. A welcome option, since DFA 21 limited is a lens designed with specific purpose, not an all round super wide.

right, nice to have another option

jslifoaw · 03-10-2022, 09:55 AM

Do we know if for this lens, electronic aperture for Pentax now means "KA4" (MF, electromagnetic aperture, CPU), "KA" (MF, mechanical auto aperture, no CPU), or "KA2" (MF, mechanical auto aperture, CPU)? I don't own any lenses from this company but would be interesting to know what degree of compatibility is offered.

(Realizing that strictly speaking, there's also no aperture ring that traditional MF A lenses have)

03-10-2022, 08:46 AM - 4 Likes	#1
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	New Ultra-Wide lens for Pentax FF... TH Swiss AG just announced the Irix 21mm f/1.4 Dragonfly, an ultra-wide angle prime lens covering the 24x36 image circle and available in particular in Pentax K mount: https://irixlens.com/photo-lenses/21mm/ €795.

03-10-2022, 08:48 AM - 4 Likes	#2
mtgmansf Veteran Member Join Date: Jun 2013 Posts: 321	New Ultra-Wide lens for Pentax FF... Irix has just produced a low-cost, ultra-wide for Pentax with a great, wide aperture: Obiektyw Irix 21mm f/1.4 Dragonfly for Pentax might be a great lens for astro at f1.4. Pros: Weather-sealed, wide aperture, and inexpensive. Cons: Heavy and not yet tested. Probably cannot take front filters.

03-10-2022, 09:16 AM	#5
lmd91343 Site Supporter Join Date: Jul 2009 Location: Los Angeles, CA USA Photos: Gallery \| Albums Posts: 1,027	Only $906.30! With TWO lens hoods. Unfortunately no fstop markings for DOF focusing. The Irix 11 has that, as does every Takumar. Important for WA lenses. Are the two lens hoods for aps and full frame use? I think I'll continue to use my SMC Tak 20, Samyang 20, and 21 DA Limited instead. Last edited by lmd91343; 03-10-2022 at 10:45 AM. Reason: Added DA

03-10-2022, 09:29 AM	#7
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527 Original Poster	24x36 image circle 15 elements in 11 groups, including 4 elements made of low-dispersion ED glass, 4 elements made of high-refractive HR glass and 2 aspherical elements 11 rounded diaphragm blades electronic controls allowing you to control the aperture from the camera and record EXIF data manual focus, internal focus ring rotation: 140° focus lock minimum focusing distance: 30 cm weather resistant (four gaskets including a bayonet one) dimensions: 95mm (maximum diameter) x 99mm to 103mm (length, depending on the mount) weight: 816g to 830g depending on the mount available in Canon EF, Nikon F and Pentax K mounts

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03-10-2022, 08:54 AM - 3 Likes	#3
LennyBloke Pentaxian Join Date: Aug 2008 Location: Worcestershire, UK Photos: Gallery Posts: 677	Great to have some choice (and competition) - it'll be interesting to see how it stands up against the D FA* 21mm f2.4 thanks for sharing

03-10-2022, 09:01 AM	#4
acoufap Site Supporter Join Date: Jan 2011 Location: Munich, Germany Photos: Gallery \| Albums Posts: 4,187	Interesting new but heavy option, fast, no filter thread, wr, auto exposure mode and exif data support, not too expensive. Nice. Thanks for the info!

03-10-2022, 09:26 AM - 2 Likes	#6
JohnMc Pentaxian Join Date: Sep 2020 Posts: 655	Originally posted by lmd91343 Only $906.30! With TWO lens hoods. Two? well that explains the 30¢

03-10-2022, 09:32 AM	#8
texandrews Moderator Join Date: Apr 2014 Location: Baltimore Photos: Albums Posts: 3,390	This was showing as a cine lens, and on the U.S. site it is listed as T1.5 (?). So, for stills I'd say the DFA 21 is going to be the better bet, since it will have AF. Also, currently lists for $1,195usd

03-10-2022, 09:39 AM - 2 Likes	#9
texandrews Moderator Join Date: Apr 2014 Location: Baltimore Photos: Albums Posts: 3,390	Two threads on this, so I merged them.

03-10-2022, 09:40 AM	#10
acoufap Site Supporter Join Date: Jan 2011 Location: Munich, Germany Photos: Gallery \| Albums Posts: 4,187	Minimum focusing distance 30cm. So for short distances there’s a clear advantage for the DFA21 and it‘s around half the weight.

03-10-2022, 09:41 AM	#11
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527 Original Poster	Originally posted by texandrews Two threads on this, so I merged them. Thank you. You might combine the titles too: "Irix 21mm f/1.4 Dragonfly, a New Ultra-Wide Lens for Pentax FF" or New Ultra-Wide Lens for Pentax FF: Irix 21mm f/1.4 Dragonfly".

03-10-2022, 09:44 AM	#12
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527 Original Poster	Originally posted by texandrews This was showing as a cine lens, and on the U.S. site it is listed as T1.5 (?). So, for stills I'd say the DFA 21 is going to be the better bet, since it will have AF. Also, currently lists for $1,195usd They first announced a cine T/1.5 version back in January and today the still f/1.4 version. Here below what I wrote in January: Originally posted by Mistral75 I won't open a new, dedicated thread since this is neither Pentax-related news, nor a rumour, but an educated guess. TH Swiss AG just announced a new lens, the Irix Cine 21mm T/1.5: https://irixlens.com/cine-lenses/21mm/ The announcement of the Irix 21mm f/1.4 Dragonfly in a few months is therefore to be expected. Like the five Irix lenses currently in TH Swiss AG's portfolio (11mm f/4 - 15mm f/2.4 - 30mm f/1.4 - 45mm f/1.4 - 150mm f/2.8 Macro) this Irix 21mm f/1.4 should be available in Pentax KA mount.

03-10-2022, 09:47 AM	#13
BarneyL Pentaxian Join Date: Feb 2017 Posts: 899	Originally posted by acoufap Minimum focusing distance 30cm. So for short distances there’s a clear advantage for the DFA21 and it‘s around half the weight. Well, the DFA is more than a stop slower, so that's no surprise it weighs much less... Looks like pretty good astro-landscape lens. A welcome option, since DFA 21 limited is a lens designed with specific purpose, not an all round super wide.

03-10-2022, 09:49 AM	#14
acoufap Site Supporter Join Date: Jan 2011 Location: Munich, Germany Photos: Gallery \| Albums Posts: 4,187	Originally posted by BarneyL Well, the DFA is more than a stop slower, so that's no surprise it weighs much less... Looks like pretty good astro-landscape lens. A welcome option, since DFA 21 limited is a lens designed with specific purpose, not an all round super wide. right, nice to have another option

03-10-2022, 09:55 AM	#15
jslifoaw Pentaxian Join Date: Apr 2007 Location: Toronto/Victoria Posts: 460	Do we know if for this lens, electronic aperture for Pentax now means "KA4" (MF, electromagnetic aperture, CPU), "KA" (MF, mechanical auto aperture, no CPU), or "KA2" (MF, mechanical auto aperture, CPU)? I don't own any lenses from this company but would be interesting to know what degree of compatibility is offered. (Realizing that strictly speaking, there's also no aperture ring that traditional MF A lenses have)