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

i83N · 02-18-2016, 01:23 PM

Originally posted by JinDesu

Per the other thread: DA* 50-135mm F2.8 ED [IF] SDM: -
- indicates does not work for FF

So you'll have to use the cropped mode.

That's the problem that i think It can be wrong, no photos to prove me wrong.

**THoog** · 02-18-2016, 01:49 PM

Originally posted by Oakland Rob

I don't suppose there are comparisons of say a K-3II with a 40mm XS wide open vs same lens wide open in crop mode on the K-1 yet? IOW, is a crop lens on the new FF sensor gonna have better IQ than the same on APS-C sensor?

It's only been 24 hours since launch, and no one (that I know of) has seen a production body yet. Patience, grasshopper!

We'll have to see what this sensor can do, but the crop area on the K-1 is ~16MP. So you'll probably see similarities to what you would see comparing a K-3II and a K-5IIs. The K-3's 24MP sensor will probably have more detail, but the K-1's 36/16MP will probably have better dynamic range and low-light performance.

**clackers** · 02-18-2016, 05:19 PM

Originally posted by Oakland Rob

Thanks guys.

I don't suppose there are comparisons of say a K-3II with a 40mm XS wide open vs same lens wide open in crop mode on the K-1 yet? IOW, is a crop lens on the new FF sensor gonna have better IQ than the same on APS-C sensor?

In crop mode, you'll lose more than half your pixels.

**Oakland Rob** · 02-18-2016, 05:56 PM

Originally posted by clackers

In crop mode, you'll lose more than half your pixels.

Well, yeah, of course...but the question is how that half looks compared to the "whole" of the APS-C shot.

If one had a non-FF lens and had to decide to use the FF cropped, or the APS-C "full," which would it be? I'd guess better AF on the FF, and certainly some reasons to use it, but if one is committed to the lens, then the FF would have to have a better IQ for that crop than the APS-C.

**THoog** · 02-18-2016, 06:01 PM

Originally posted by Oakland Rob

then the FF would have to have a better IQ for that crop than the APS-C.

How are you defining 'better IQ'? More, smaller pixels give better detail. Less, bigger pixels give better dynamic range and low-light response. When the K-3 came out, there were quite a few folks calling for a K-5III, with all the features of the K-3 but the 16MP sensor of the K-5.

**Oakland Rob** · 02-18-2016, 06:53 PM

Originally posted by THoog

How are you defining 'better IQ'? More, smaller pixels give better detail. Less, bigger pixels give better dynamic range and low-light response. When the K-3 came out, there were quite a few folks calling for a K-5III, with all the features of the K-3 but the 16MP sensor of the K-5.

Just a balance of all of the above, in say different scenarios like landscape, portrait, etc. It's obviously influenced by the lens as well. We compare sensors all the time; what works depends on how much you value the particular balance of criteria.

**clackers** · 02-18-2016, 07:55 PM

Originally posted by Oakland Rob

Well, yeah, of course...but the question is how that half looks compared to the "whole" of the APS-C shot.

If one had a non-FF lens and had to decide to use the FF cropped, or the APS-C "full," which would it be? I'd guess better AF on the FF, and certainly some reasons to use it, but if one is committed to the lens, then the FF would have to have a better IQ for that crop than the APS-C.

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.

hectorse · 02-18-2016, 07:59 PM

Does the DA 50/1.8 cover the whole FF circle?

**clackers** · 02-18-2016, 08:15 PM

Originally posted by hectorse

Does the DA 50/1.8 cover the whole FF circle?

Yes, the Pentax site says 'Stopped down' - as it does for others - but it's fine.

hectorse · 02-18-2016, 08:21 PM

Originally posted by clackers

Yes, the Pentax site says 'Stopped down' - as it does for others - but it's fine.

That's great

what site are you refereing too?

**clackers** · 02-18-2016, 09:21 PM

Originally posted by hectorse

That's great

what site are you refereing too?

There's a list that was put up in one of the threads or review sites ... perhaps from a press release.

Look, what we've known for a long time now is that all the K, M, A, F, FA, etc film era lenses work, the D FA series, as well as normal and long DA and DA* primes.

The wider DA primes will need crop mode as will basically any DA or DA* zoom - but even they may be fine at certain focal lengths.

Check the lenses on FF club in this very forum for experiments going back several years.

[Edit: DPR had the Ricoh information: http://www.dpreview.com/reviews/pentax-k-1/ ]

ScooterMaxi Jim · 02-18-2016, 10:01 PM

I suspect we will be hearing a push for a 1.3x crop mode, or something like 30x20mm as an intermediate setting as a FW upgrade.

As some of us had predicted, what "works" on a Sony FF or film might not match up right on the Pentax system with SR. I suspect the restrictions listed by Pentax will be more accurate than the optimistic reports from hopeful backyard testers.

99exposures · 02-18-2016, 10:07 PM

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

I think it should but some confirmatio would be great. Thx.

Sandy Hancock · 02-18-2016, 10:12 PM

Originally posted by i83N

i broke my brain but will DA* 50-135mm cropped or just stopped down?

I have tested it on my PZ-1, and it's definitely no good on full frame at any focal length.

You want proof?

Near-infinity focus at 135mm. The vignetting is even worse at close focus.

135 @ infinity(ish)

And at 50mm. Both taken with the hood off.

It's bloody good on crop though

i83N · 02-18-2016, 10:25 PM

Originally posted by Sandy Hancock

I have tested it on my PZ-1, and it's definitely no good on full frame at any focal length.

You want proof?

Near-infinity focus at 135mm. The vignetting is even worse at close focus.

135 @ infinity(ish)

And at 50mm. Both taken with the hood off.

It’s bloody good on crop though

Thank you.
That’s not such a bad vignetting on 135mm that you cant work around.
Ok lets wait and see how it works on K-1.

02-18-2016, 09:21 PM	#26
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by hectorse That's great what site are you refereing too? There's a list that was put up in one of the threads or review sites ... perhaps from a press release. Look, what we've known for a long time now is that all the K, M, A, F, FA, etc film era lenses work, the D FA series, as well as normal and long DA and DA* primes. The wider DA primes will need crop mode as will basically any DA or DA* zoom - but even they may be fine at certain focal lengths. Check the lenses on FF club in this very forum for experiments going back several years. [Edit: DPR had the Ricoh information: http://www.dpreview.com/reviews/pentax-k-1/ ] Last edited by clackers; 02-18-2016 at 09:27 PM.

02-18-2016, 10:12 PM	#29
Sandy Hancock Moderator Site Supporter Join Date: Feb 2012 Location: Adelaide Hills, South Australia Photos: Gallery \| Albums Posts: 11,275	Originally posted by i83N i broke my brain but will DA* 50-135mm cropped or just stopped down? I have tested it on my PZ-1, and it's definitely no good on full frame at any focal length. You want proof? Near-infinity focus at 135mm. The vignetting is even worse at close focus. 135 @ infinity(ish) And at 50mm. Both taken with the hood off. It's bloody good on crop though Last edited by Sandy Hancock; 02-18-2016 at 10:19 PM.

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02-18-2016, 01:23 PM	#16
i83N Veteran Member Join Date: Mar 2009 Location: Lithuania Photos: Gallery Posts: 1,203	Originally posted by JinDesu Per the other thread: DA* 50-135mm F2.8 ED [IF] SDM: - - indicates does not work for FF So you'll have to use the cropped mode. That's the problem that i think It can be wrong, no photos to prove me wrong.

02-18-2016, 01:49 PM	#17
THoog Loyal Site Supporter Join Date: Aug 2012 Location: North Carolina Photos: Gallery \| Albums Posts: 3,685	Originally posted by Oakland Rob I don't suppose there are comparisons of say a K-3II with a 40mm XS wide open vs same lens wide open in crop mode on the K-1 yet? IOW, is a crop lens on the new FF sensor gonna have better IQ than the same on APS-C sensor? It's only been 24 hours since launch, and no one (that I know of) has seen a production body yet. Patience, grasshopper! We'll have to see what this sensor can do, but the crop area on the K-1 is ~16MP. So you'll probably see similarities to what you would see comparing a K-3II and a K-5IIs. The K-3's 24MP sensor will probably have more detail, but the K-1's 36/16MP will probably have better dynamic range and low-light performance.

02-18-2016, 05:19 PM	#18
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Oakland Rob Thanks guys. I don't suppose there are comparisons of say a K-3II with a 40mm XS wide open vs same lens wide open in crop mode on the K-1 yet? IOW, is a crop lens on the new FF sensor gonna have better IQ than the same on APS-C sensor? In crop mode, you'll lose more than half your pixels.

02-18-2016, 05:56 PM	#19
Oakland Rob Loyal Site Supporter Join Date: Apr 2015 Location: Bay Area California Photos: Gallery \| Albums Posts: 798 Original Poster	Originally posted by clackers In crop mode, you'll lose more than half your pixels. Well, yeah, of course...but the question is how that half looks compared to the "whole" of the APS-C shot. If one had a non-FF lens and had to decide to use the FF cropped, or the APS-C "full," which would it be? I'd guess better AF on the FF, and certainly some reasons to use it, but if one is committed to the lens, then the FF would have to have a better IQ for that crop than the APS-C.

02-18-2016, 06:01 PM	#20
THoog Loyal Site Supporter Join Date: Aug 2012 Location: North Carolina Photos: Gallery \| Albums Posts: 3,685	Originally posted by Oakland Rob then the FF would have to have a better IQ for that crop than the APS-C. How are you defining 'better IQ'? More, smaller pixels give better detail. Less, bigger pixels give better dynamic range and low-light response. When the K-3 came out, there were quite a few folks calling for a K-5III, with all the features of the K-3 but the 16MP sensor of the K-5.

02-18-2016, 06:53 PM	#21
Oakland Rob Loyal Site Supporter Join Date: Apr 2015 Location: Bay Area California Photos: Gallery \| Albums Posts: 798 Original Poster	Originally posted by THoog How are you defining 'better IQ'? More, smaller pixels give better detail. Less, bigger pixels give better dynamic range and low-light response. When the K-3 came out, there were quite a few folks calling for a K-5III, with all the features of the K-3 but the 16MP sensor of the K-5. Just a balance of all of the above, in say different scenarios like landscape, portrait, etc. It's obviously influenced by the lens as well. We compare sensors all the time; what works depends on how much you value the particular balance of criteria.

02-18-2016, 07:55 PM	#22
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Oakland Rob Well, yeah, of course...but the question is how that half looks compared to the "whole" of the APS-C shot. If one had a non-FF lens and had to decide to use the FF cropped, or the APS-C "full," which would it be? I'd guess better AF on the FF, and certainly some reasons to use it, but if one is committed to the lens, then the FF would have to have a better IQ for that crop than the APS-C. 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.

02-18-2016, 07:59 PM	#23
hectorse New Member Join Date: Nov 2009 Photos: Albums Posts: 21	Does the DA 50/1.8 cover the whole FF circle?

02-18-2016, 08:15 PM	#24
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by hectorse Does the DA 50/1.8 cover the whole FF circle? Yes, the Pentax site says 'Stopped down' - as it does for others - but it's fine.

02-18-2016, 08:21 PM	#25
hectorse New Member Join Date: Nov 2009 Photos: Albums Posts: 21	Originally posted by clackers Yes, the Pentax site says 'Stopped down' - as it does for others - but it's fine. That's great what site are you refereing too?

02-18-2016, 10:01 PM	#27
ScooterMaxi Jim Veteran Member Join Date: Jul 2009 Location: Minnesota Posts: 1,520	I suspect we will be hearing a push for a 1.3x crop mode, or something like 30x20mm as an intermediate setting as a FW upgrade. As some of us had predicted, what "works" on a Sony FF or film might not match up right on the Pentax system with SR. I suspect the restrictions listed by Pentax will be more accurate than the optimistic reports from hopeful backyard testers.

02-18-2016, 10:07 PM	#28
99exposures New Member Join Date: Oct 2015 Posts: 23	Will the pentax da★300mm f4 ed work with k1 in aps c mode? I think it should but some confirmatio would be great. Thx.

02-18-2016, 10:25 PM	#30
i83N Veteran Member Join Date: Mar 2009 Location: Lithuania Photos: Gallery Posts: 1,203	Originally posted by Sandy Hancock I have tested it on my PZ-1, and it's definitely no good on full frame at any focal length. You want proof? Near-infinity focus at 135mm. The vignetting is even worse at close focus. 135 @ infinity(ish) And at 50mm. Both taken with the hood off. It’s bloody good on crop though Thank you. That’s not such a bad vignetting on 135mm that you cant work around. Ok lets wait and see how it works on K-1.