So...which lenses work with the K-1?

**clackers** · 02-19-2016, 01:50 AM - **1 Like**

Originally posted by 99exposures

Will the pentax da★300mm f4 ed work with k1 in aps c mode?
.

Even better for you, 99exposures, it works in full frame.

99exposures · 02-19-2016, 09:15 AM

Originally posted by clackers

Even better for you, 99exposures, it works in full frame.

Sweet! Wait, with vignetting I suppose?

**filoxophy** · 02-19-2016, 09:29 AM

Originally posted by 99exposures

Sweet! Wait, with vignetting I suppose?

No, it is a FF design per Ricoh's released lens compatibility list.

**Oakland Rob** · 02-19-2016, 09:42 AM

Originally posted by clackers

Losing 50 percent of your pixels is a big hit, Rob.

Some would say you just spent $1800 on PQ your K5-IIS could have done! Something to use as a last resort, IMHO.

I override the Auto Crop on my Sony A7 if I know the APS-C lens covers more than the standard crop, which I'm happy to do myself in post.

You'll find DA lenses like the DA35, DA50 and DA70 are just fine.

I have two beautiful zooms - the Sigma 17-50 f2.8 and the DA*50-135 f2.8 that I won't even try to put on FF. I use the Tamron 28-75 f2.8 and 70-200 f2.8 instead.

I am aware of the sensor difference.

But I still have the question. And that is indeed the dilemma: would it be worth using the K-1 or would even the K-50 do? Or maybe even a M43 body? probably more an issue for long lenses I'd expect. And even if they fill the sensor, some lenses are rather crappy at the edges, although in other situations that might be desirable.

Which brings me to another question: I've seen pictures of the "crop" view in the K-1 viewfinder (and I assume live view is the same). Does the camera only crop JPEG? I would assume if you're using DNG it would always produce uncropped images, but I've already been wrong and may be wrong on this too. I ask cuz I wonder if the camera does anything but crop, like use some of the "extra" image it sees outside the crop for exposure, etc.

99exposures · 02-19-2016, 09:50 AM

Originally posted by filoxophy

No, it is a FF design per Ricoh's released lens compatibility list.

oh i got confused by adorama. yesterday adorama's website put "not compatible with ff" on the da*300mm.

**Oakland Rob** · 02-19-2016, 09:51 AM - **1 Like**

Originally posted by 99exposures

Sweet! Wait, with vignetting I suppose?

smc DA* 300mm "f/4.0" - Search Results - PentaxForums.com

Unfortunately, the links to the photos are dead. Reports vignetting at F4, but I dunno whether that would be true on the K-1.

BrianR · 02-19-2016, 11:05 AM - **1 Like**

Some test photos for the DA*300mm can be found here:

DA* 300mm f/4 on Z-1p

He notes the lens hood as a possible cause for the vignetting at f/4. It definitely covers the full frame.

beholder3 · 02-19-2016, 11:20 AM - **1 Like**

The Pentax DA*300 at F4 used on a Canon 5DIII (quick test handheld):

mee · 02-20-2016, 07:36 AM

Originally posted by pathdoc

PENTAX K-1 Laboratory | PENTAX K-1 Special site | RICOH IMAGING

"Coming Soon"

hmmmmmmm. That could mean today or on launch day (at the end of April) or several months after that or several years after that or..

I hope they (or someone else) does a test site where they have each lens in the same setting, shot with each different aperture from max to around f/8 that can be cycled through a drop down box. That would be spiffy.

Transit · 02-20-2016, 02:26 PM

have seen comments on other forums that the K1 will out resolve old lenses. Is that a reality ?
I can imagine chromatic issues could effect resolution. Is it down to the pixel density ?
Are they more tightly packed than my K-5iis ?

**clackers** · 02-20-2016, 02:35 PM

Originally posted by Transit

have seen comments on other forums that the K1 will out resolve old lenses. Is that a reality ?
I can imagine chromatic issues could effect resolution. Is it down to the pixel density ?
Are they more tightly packed than my K-5iis ?

Ignore them. It's the same density as your K-5iis.

Transit · 02-20-2016, 02:41 PM

Originally posted by clackers

Ignore them. It's the same density as your K-5iis.

goodoh thanks

normhead · 02-20-2016, 02:55 PM

I can show you almost as bad vignetting on my 18-135 , maybe it's really a 4/3 lens.

Class A · 02-20-2016, 09:50 PM

Originally posted by Oakland Rob

I'm still sorta confused about which lenses will work in FF glory on the K-1.

I have compiled a list of FF lenses that are in current lens manufacturers catalogues.

Class A · 02-20-2016, 09:57 PM

Originally posted by Transit

have seen comments on other forums that the K1 will out resolve old lenses.

The K-1 does not challenge lenses anymore than a 16MP APS-C camera.

As a matter of fact, if you consider the same output size (say 8x10) then the K-1 will make one and the same lens look better. This argument is not considering equivalent images, i.e., obviously a lens like the FA 50/1.4 will have a wide angle of view on the K-1, but if you just consider the image sharpness (ignoring what is included) the lower enlargement factor of the K-1 will produce the better image.

Needless to say that a K-3 (II) with its 24MP pixels does stress lens more than the K-1. But even 24MP are not enough to outresolve a decent lens, as old as the latter may be.

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02-19-2016, 01:50 AM - 1 Like	#31
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by 99exposures Will the pentax da★300mm f4 ed work with k1 in aps c mode? . Even better for you, 99exposures, it works in full frame.

02-19-2016, 09:15 AM	#32
99exposures New Member Join Date: Oct 2015 Posts: 23	Originally posted by clackers Even better for you, 99exposures, it works in full frame. Sweet! Wait, with vignetting I suppose?

02-19-2016, 09:29 AM	#33
filoxophy Site Supporter Join Date: Jul 2012 Location: Albuquerque Posts: 1,133	Originally posted by 99exposures Sweet! Wait, with vignetting I suppose? No, it is a FF design per Ricoh's released lens compatibility list.

02-19-2016, 09:42 AM	#34
Oakland Rob Loyal Site Supporter Join Date: Apr 2015 Location: Bay Area California Photos: Gallery \| Albums Posts: 798 Original Poster	Originally posted by clackers Losing 50 percent of your pixels is a big hit, Rob. Some would say you just spent $1800 on PQ your K5-IIS could have done! Something to use as a last resort, IMHO. I override the Auto Crop on my Sony A7 if I know the APS-C lens covers more than the standard crop, which I'm happy to do myself in post. You'll find DA lenses like the DA35, DA50 and DA70 are just fine. I have two beautiful zooms - the Sigma 17-50 f2.8 and the DA*50-135 f2.8 that I won't even try to put on FF. I use the Tamron 28-75 f2.8 and 70-200 f2.8 instead. I am aware of the sensor difference. But I still have the question. And that is indeed the dilemma: would it be worth using the K-1 or would even the K-50 do? Or maybe even a M43 body? probably more an issue for long lenses I'd expect. And even if they fill the sensor, some lenses are rather crappy at the edges, although in other situations that might be desirable. Which brings me to another question: I've seen pictures of the "crop" view in the K-1 viewfinder (and I assume live view is the same). Does the camera only crop JPEG? I would assume if you're using DNG it would always produce uncropped images, but I've already been wrong and may be wrong on this too. I ask cuz I wonder if the camera does anything but crop, like use some of the "extra" image it sees outside the crop for exposure, etc.

02-19-2016, 09:50 AM	#35
99exposures New Member Join Date: Oct 2015 Posts: 23	Originally posted by filoxophy No, it is a FF design per Ricoh's released lens compatibility list. oh i got confused by adorama. yesterday adorama's website put "not compatible with ff" on the da*300mm.

02-19-2016, 09:51 AM - 1 Like	#36
Oakland Rob Loyal Site Supporter Join Date: Apr 2015 Location: Bay Area California Photos: Gallery \| Albums Posts: 798 Original Poster	Originally posted by 99exposures Sweet! Wait, with vignetting I suppose? smc DA* 300mm "f/4.0" - Search Results - PentaxForums.com Unfortunately, the links to the photos are dead. Reports vignetting at F4, but I dunno whether that would be true on the K-1.

02-19-2016, 11:05 AM - 1 Like	#37
BrianR Veteran Member Join Date: Dec 2010 Location: Ontario Photos: Gallery Posts: 3,332	Some test photos for the DA300mm can be found here: DA 300mm f/4 on Z-1p He notes the lens hood as a possible cause for the vignetting at f/4. It definitely covers the full frame.

02-19-2016, 11:20 AM - 1 Like	#38
beholder3 Pentaxian Join Date: Dec 2011 Posts: 3,112	The Pentax DA*300 at F4 used on a Canon 5DIII (quick test handheld):

02-20-2016, 07:36 AM	#39
mee Veteran Member Join Date: May 2010 Posts: 7,403	Originally posted by pathdoc PENTAX K-1 Laboratory \| PENTAX K-1 Special site \| RICOH IMAGING "Coming Soon" hmmmmmmm. That could mean today or on launch day (at the end of April) or several months after that or several years after that or.. I hope they (or someone else) does a test site where they have each lens in the same setting, shot with each different aperture from max to around f/8 that can be cycled through a drop down box. That would be spiffy.

02-20-2016, 02:26 PM	#40
Transit Pentaxian Join Date: Aug 2007 Location: Whanganui NZ Photos: Gallery \| Albums Posts: 4,624	have seen comments on other forums that the K1 will out resolve old lenses. Is that a reality ? I can imagine chromatic issues could effect resolution. Is it down to the pixel density ? Are they more tightly packed than my K-5iis ?

02-20-2016, 02:35 PM	#41
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Transit have seen comments on other forums that the K1 will out resolve old lenses. Is that a reality ? I can imagine chromatic issues could effect resolution. Is it down to the pixel density ? Are they more tightly packed than my K-5iis ? Ignore them. It's the same density as your K-5iis.

02-20-2016, 02:41 PM	#42
Transit Pentaxian Join Date: Aug 2007 Location: Whanganui NZ Photos: Gallery \| Albums Posts: 4,624	Originally posted by clackers Ignore them. It's the same density as your K-5iis. goodoh thanks

02-20-2016, 02:55 PM	#43
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451	I can show you almost as bad vignetting on my 18-135 , maybe it's really a 4/3 lens.

02-20-2016, 09:50 PM	#44
Class A Pentaxian Join Date: Aug 2008 Location: Wellington, New Zealand Posts: 11,251	Originally posted by Oakland Rob I'm still sorta confused about which lenses will work in FF glory on the K-1. I have compiled a list of FF lenses that are in current lens manufacturers catalogues.

02-20-2016, 09:57 PM	#45
Class A Pentaxian Join Date: Aug 2008 Location: Wellington, New Zealand Posts: 11,251	Originally posted by Transit have seen comments on other forums that the K1 will out resolve old lenses. The K-1 does not challenge lenses anymore than a 16MP APS-C camera. As a matter of fact, if you consider the same output size (say 8x10) then the K-1 will make one and the same lens look better. This argument is not considering equivalent images, i.e., obviously a lens like the FA 50/1.4 will have a wide angle of view on the K-1, but if you just consider the image sharpness (ignoring what is included) the lower enlargement factor of the K-1 will produce the better image. Needless to say that a K-3 (II) with its 24MP pixels does stress lens more than the K-1. But even 24MP are not enough to outresolve a decent lens, as old as the latter may be.