Fast rectilinear super wides for K1

**clackers** · 05-29-2016, 09:36 PM

Originally posted by stevebrot

Th

As for legacy glass: Pentax FA* 24/1.8

f2 rather than f1.8?

stevebrot · 05-29-2016, 10:03 PM

Originally posted by clackers

f2 rather than f1.8?

Yes...f/2

Thanks for the kick!

Steve

**Ed Hurst** · 05-30-2016, 03:43 AM

Thanks everyone for the input. Very useful!

The usage I have in mind is Milky Way photography making use of the K1's astrotracking capability. I'm aiming for the ability to do it without stitching, or not much anyway, which requires a very wide field of view. Ideally a wide aperture also helps control noise by reducing required ISO, though of course the astrotracking allows longer exposures without trailing (though very low ISOs will remain out of reach, as the function starts to reach its precision limit in exposure duration - so lens speed is still a consideration).

In the end, I can stitch more of course, but would be nice not to have to.

If I want to achieve super high quality, UWA and high speed, it seems the lenses don't yet exist for the K1.

D1N0 · 05-30-2016, 04:06 AM

Originally posted by Ed Hurst

Thanks everyone for the input. Very useful!

The usage I have in mind is Milky Way photography making use of the K1's astrotracking capability. I'm aiming for the ability to do it without stitching, or not much anyway, which requires a very wide field of view. Ideally a wide aperture also helps control noise by reducing required ISO, though of course the astrotracking allows longer exposures without trailing (though very low ISOs will remain out of reach, as the function starts to reach its precision limit in exposure duration - so lens speed is still a consideration).

In the end, I can stitch more of course, but would be nice not to have to.

If I want to achieve super high quality, UWA and high speed, it seems the lenses don't yet exist for the K1.

Nor for other brands on full frame. There is the Sigma 20mm F1.4 and the Nikon 20mm F1.8 But nothing below 20mm. The Samyang 16mm F2 is an aps-c lens. F2.8 is the brightest you will get in the 14-19mm range (apart from the Irix which is 2.4). Your best bets for astrography would be the yet to be launched Irix or the Samyang 14mm F2.8 which is a steal. (Here's a review: http://www.lonelyspeck.com/rokinon-14mm-f2-8-review/ )

Last edited by D1N0; 05-30-2016 at 04:12 AM.

Gimbal · 05-30-2016, 04:10 AM

Look into Samyangs wide lenses, they are supposedly very good when it comes to astrophotography.

**Ed Hurst** · 05-30-2016, 06:08 AM

Originally posted by D1N0

Nor for other brands on full frame. There is the Sigma 20mm F1.4 and the Nikon 20mm F1.8 But nothing below 20mm. The Samyang 16mm F2 is an aps-c lens. F2.8 is the brightest you will get in the 14-19mm range (apart from the Irix which is 2.4). Your best bets for astrography would be the yet to be launched Irix or the Samyang 14mm F2.8 which is a steal. (Here's a review: Rokinon 14mm f/2.8 IF ED UMC Review – Lonely Speck )

I'd settle for a K1 compatible version of the Nikon 14-24 f2.8 or Tamron 15-30 f2.8 to be honest. Either outperforms the Samyang/Rokinon I believe...? Out to FF corners anyway...

D1N0 · 05-30-2016, 06:17 AM

Originally posted by Ed Hurst

or Tamron 15-30 f2.8

There is one: HD Pentax-D FA 15-30mm F2.8 ED SDM WR Reviews - D FA Zoom Lenses - Pentax Lens Reviews & Lens Database

**Ed Hurst** · 05-30-2016, 06:37 AM

Originally posted by D1N0

There is one: HD Pentax-D FA 15-30mm F2.8 ED SDM WR Reviews - D FA Zoom Lenses - Pentax Lens Reviews & Lens Database

Thanks for that. Had rejected that option for its poor corner performance...

Franc · 05-30-2016, 06:39 AM

Originally posted by Ed Hurst

Thanks for that. Had rejected that option for its poor corner performance...

You like the Tamron version but not the Pentax one? Thats weird, its the same lens. The Pentax version is a rebadged Tamron (with better coatings e.d)

---------- Post added 30th May 2016 at 15:58 ----------

there is a Zeiss Distagon 15/2.8 in M42 available. That should fit and work.

Auzzie-Phoenix · 05-30-2016, 03:36 PM

Wouldn't the distagon be more susceptible to coma though?

Adam · 05-30-2016, 03:43 PM

Originally posted by Ed Hurst

Thanks for that. Had rejected that option for its poor corner performance...

The corners aren't any worse than say the 24-70mm at 70mm. The reason people complain is mainly field curvature. Since the astrotracer will likely soften your corners regardless, I wouldn't consider this to be an issue- plus the lens is extremely sharp otherwise.

That said, overall the Pentax lineup is still missing fast ultra wide prime options, but if you look at Nikon many of theirs were also just added recently.

osv · 05-31-2016, 08:22 AM

Originally posted by Ed Hurst

Thanks everyone for the input. Very useful!

The usage I have in mind is Milky Way photography making use of the K1's astrotracking capability.

Tamron 15-30 mm f/2.8 Di VC USD review - Coma, astigmatism and bokeh - LensTip.com

05-30-2016, 03:43 PM	#26
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,593	Originally posted by Ed Hurst Thanks for that. Had rejected that option for its poor corner performance... The corners aren't any worse than say the 24-70mm at 70mm. The reason people complain is mainly field curvature. Since the astrotracer will likely soften your corners regardless, I wouldn't consider this to be an issue- plus the lens is extremely sharp otherwise. That said, overall the Pentax lineup is still missing fast ultra wide prime options, but if you look at Nikon many of theirs were also just added recently. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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05-29-2016, 09:36 PM	#16
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,395	Originally posted by stevebrot Th As for legacy glass: Pentax FA* 24/1.8 f2 rather than f1.8?

05-29-2016, 10:03 PM	#17
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by clackers f2 rather than f1.8? Yes...f/2 Thanks for the kick! Steve

05-30-2016, 03:43 AM	#18
Ed Hurst Site Supporter Join Date: May 2010 Location: Sydney Posts: 1,656 Original Poster	Thanks everyone for the input. Very useful! The usage I have in mind is Milky Way photography making use of the K1's astrotracking capability. I'm aiming for the ability to do it without stitching, or not much anyway, which requires a very wide field of view. Ideally a wide aperture also helps control noise by reducing required ISO, though of course the astrotracking allows longer exposures without trailing (though very low ISOs will remain out of reach, as the function starts to reach its precision limit in exposure duration - so lens speed is still a consideration). In the end, I can stitch more of course, but would be nice not to have to. If I want to achieve super high quality, UWA and high speed, it seems the lenses don't yet exist for the K1.

05-30-2016, 04:06 AM	#19
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	Originally posted by Ed Hurst Thanks everyone for the input. Very useful! The usage I have in mind is Milky Way photography making use of the K1's astrotracking capability. I'm aiming for the ability to do it without stitching, or not much anyway, which requires a very wide field of view. Ideally a wide aperture also helps control noise by reducing required ISO, though of course the astrotracking allows longer exposures without trailing (though very low ISOs will remain out of reach, as the function starts to reach its precision limit in exposure duration - so lens speed is still a consideration). In the end, I can stitch more of course, but would be nice not to have to. If I want to achieve super high quality, UWA and high speed, it seems the lenses don't yet exist for the K1. Nor for other brands on full frame. There is the Sigma 20mm F1.4 and the Nikon 20mm F1.8 But nothing below 20mm. The Samyang 16mm F2 is an aps-c lens. F2.8 is the brightest you will get in the 14-19mm range (apart from the Irix which is 2.4). Your best bets for astrography would be the yet to be launched Irix or the Samyang 14mm F2.8 which is a steal. (Here's a review: http://www.lonelyspeck.com/rokinon-14mm-f2-8-review/ ) Last edited by D1N0; 05-30-2016 at 04:12 AM.

05-30-2016, 04:10 AM	#20
Gimbal Pentaxian Join Date: Apr 2007 Location: Sweden Posts: 2,106	Look into Samyangs wide lenses, they are supposedly very good when it comes to astrophotography.

05-30-2016, 06:08 AM	#21
Ed Hurst Site Supporter Join Date: May 2010 Location: Sydney Posts: 1,656 Original Poster	Originally posted by D1N0 Nor for other brands on full frame. There is the Sigma 20mm F1.4 and the Nikon 20mm F1.8 But nothing below 20mm. The Samyang 16mm F2 is an aps-c lens. F2.8 is the brightest you will get in the 14-19mm range (apart from the Irix which is 2.4). Your best bets for astrography would be the yet to be launched Irix or the Samyang 14mm F2.8 which is a steal. (Here's a review: Rokinon 14mm f/2.8 IF ED UMC Review – Lonely Speck ) I'd settle for a K1 compatible version of the Nikon 14-24 f2.8 or Tamron 15-30 f2.8 to be honest. Either outperforms the Samyang/Rokinon I believe...? Out to FF corners anyway...

05-30-2016, 06:17 AM	#22
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	Originally posted by Ed Hurst or Tamron 15-30 f2.8 There is one: HD Pentax-D FA 15-30mm F2.8 ED SDM WR Reviews - D FA Zoom Lenses - Pentax Lens Reviews & Lens Database

05-30-2016, 06:37 AM	#23
Ed Hurst Site Supporter Join Date: May 2010 Location: Sydney Posts: 1,656 Original Poster	Originally posted by D1N0 There is one: HD Pentax-D FA 15-30mm F2.8 ED SDM WR Reviews - D FA Zoom Lenses - Pentax Lens Reviews & Lens Database Thanks for that. Had rejected that option for its poor corner performance...

05-30-2016, 06:39 AM	#24
Franc Pentaxian Join Date: Jan 2010 Location: Hoevelaken Photos: Gallery Posts: 1,211	Originally posted by Ed Hurst Thanks for that. Had rejected that option for its poor corner performance... You like the Tamron version but not the Pentax one? Thats weird, its the same lens. The Pentax version is a rebadged Tamron (with better coatings e.d) ---------- Post added 30th May 2016 at 15:58 ---------- there is a Zeiss Distagon 15/2.8 in M42 available. That should fit and work.

05-30-2016, 03:36 PM	#25
Auzzie-Phoenix Veteran Member Join Date: Sep 2014 Photos: Albums Posts: 1,020	Wouldn't the distagon be more susceptible to coma though?

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05-31-2016, 08:22 AM	#27
osv Veteran Member Join Date: Mar 2007 Location: So Cal Photos: Gallery Posts: 2,080	Originally posted by Ed Hurst Thanks everyone for the input. Very useful! The usage I have in mind is Milky Way photography making use of the K1's astrotracking capability. Tamron 15-30 mm f/2.8 Di VC USD review - Coma, astigmatism and bokeh - LensTip.com