K-30 Tungsten vs CFL Test

FruitLooPs · 07-10-2012, 01:20 AM

I see people are asking about this, or at least Tungsten light tests.

I hope someone with a faster accurate lens can try out some more tests, mine is only with the 18-55mm @ 5.6 and 55mm AWB & JPG. My 17-50 F2.8 is far too out of whack to be used for such a test haha.

I don't know anything about the K-5 issues, or how serious they were etc. I leave these results entirely up to your interpretation

It's dark out so no natural light comparison.

The focus chart is a pretty flimsy bit of printer paper, so some user error could have occured YMMV sue me etc

Pheo · 07-10-2012, 01:44 AM

If you ping me the sheet I can try to test it under these lighting conditions as well. But with the Tamron and the 18-135mm lenses.

I take it we are looking for a focus "miss" on the latter shot?

Raffwal · 07-10-2012, 02:14 AM

The focusing chart in question is probably by Yvon Bourque:

PENTAX DSLRs: Front or Back Focusing Problems? Free test (Lens Alignment) charts for Pentax, Nikon, Canon, Sony, Olympus.

FruitLooPs · 07-10-2012, 02:25 AM

Yes those charts, direct link for them is here: http://www.k10dbook.com/newchart.pdf

If you have a more sturdy paper it would be a help. I've only had the K20D prior to this, but I hear lots of chatter about the K5/Kx front focusing in tungsten lighting that was making people wild - just how much i'm not sure.

I only have one true tungsten light left (my porch, hence the brick pattern background for tungsten lol) and its literally freezing out so no more testing from me tonight! All my others are energysavers.

I must say though, I would be surprised if this glitch still occurred after the re-working of AF detect in the camera.

Last edited by FruitLooPs; 07-10-2012 at 02:33 AM.

Pheo · 07-10-2012, 04:41 AM

I'm going to have to find a tungsten bulb. Could be challenging, they're stopping producing them in the EU!

I suppose that is one way of solving the tungsten issue!

goldenarrow · 07-10-2012, 04:45 AM

Nice chart to test with, thanks.

Docrwm · 07-10-2012, 05:33 AM

Thanks to each of you guys!

SteveB · 07-10-2012, 11:28 AM

Was this done using a tripod or something solid as a camera base? With hand-held it's so easy to move a bit after getting a focus lock. They look quite close to dead right viewed full size.

chiane · 07-10-2012, 11:54 AM - **1 Like**

Can someone summarize what the results are? Every time I look at people shooting charts and brick walls, my eyes cross and my brain shuts off.

**Deimos** · 07-10-2012, 12:44 PM

Originally posted by chiane

Can someone summarize what the results are? Every time I look at people shooting charts and brick walls, my eyes cross and my brain shuts off.

looks like there is still some front focusing, but not to the point where you would likely miss focus (with that lens), need to see it with a f1.4-2.0 really as thats where you are going to have issues but nice test

FruitLooPs · 07-10-2012, 01:48 PM

Originally posted by SteveB

Was this done using a tripod or something solid as a camera base? With hand-held it's so easy to move a bit after getting a focus lock. They look quite close to dead right viewed full size.

1st is tripod indoors, second on a stack of books. Shouldn't be any movement.

This lens also has quite a bit of correction adjustment applied to it (-7) so I too would like to see another lens tested like F2.8

The chart is flimsy though, so if the front section is bowed slightly outward in one and inward in the other that could influence results etc. Not ideal, but better than nothing - like I said i'm not sure if the K5 was out by like 20cm in low tungsten light or not, if it is then you can probably safely say this isn't an issue.

Pheo · 07-10-2012, 03:21 PM

Hi Guys,

Sorry this is on my todo list but had to work late. Will try to get to it tomorrow.

Docrwm · 07-10-2012, 04:20 PM

Originally posted by Pheo

Hi Guys,

Sorry this is on my todo list but had to work late. Will try to get to it tomorrow.

What!? Work before doing our bidding! What is this world coming to!>!

deadwolfbones · 07-10-2012, 11:15 PM

Hey guys.

I've only had a K-30 in my possession for a few hours now, but I've taken a few BS SOOC JPEG shots in very dim light here in my office area this evening. The room is currently lit by 2 CFL bulbs under shades (don't actually have any tungsten in my house). Both with the FA 43 Limited wide open (f/1.9):

ISO 3200, 1/20sec (click for full size)

ISO 3200, 1/50sec (click for full size)

Less useful than a focusing chart, but the accuracy looks superb to my eye. Very pleased over here. Didn't take long to focus, either.

deadwolfbones · 07-10-2012, 11:17 PM

And just for kicks, here's one in natural light earlier today:

f/2.2, ISO 100, 1/2000sec

07-10-2012, 01:20 AM	#1
FruitLooPs Veteran Member Join Date: Dec 2007 Location: New Zealand Photos: Gallery \| Albums Posts: 440	K-30 Tungsten vs CFL Test I see people are asking about this, or at least Tungsten light tests. I hope someone with a faster accurate lens can try out some more tests, mine is only with the 18-55mm @ 5.6 and 55mm AWB & JPG. My 17-50 F2.8 is far too out of whack to be used for such a test haha. I don't know anything about the K-5 issues, or how serious they were etc. I leave these results entirely up to your interpretation It's dark out so no natural light comparison. The focus chart is a pretty flimsy bit of printer paper, so some user error could have occured YMMV sue me etc

07-10-2012, 04:45 AM	#6
goldenarrow Veteran Member Join Date: Jun 2009 Location: Chicago Suburbs. Photos: Gallery Posts: 501	thanks for the link Nice chart to test with, thanks.

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07-10-2012, 01:44 AM	#2
Pheo Veteran Member Join Date: Nov 2006 Location: Brighton, United Kingdom Photos: Gallery Posts: 311	If you ping me the sheet I can try to test it under these lighting conditions as well. But with the Tamron and the 18-135mm lenses. I take it we are looking for a focus "miss" on the latter shot?

07-10-2012, 02:14 AM	#3
Raffwal Veteran Member Join Date: Oct 2010 Location: The North Posts: 879	The focusing chart in question is probably by Yvon Bourque: PENTAX DSLRs: Front or Back Focusing Problems? Free test (Lens Alignment) charts for Pentax, Nikon, Canon, Sony, Olympus.

07-10-2012, 02:25 AM	#4
FruitLooPs Veteran Member Join Date: Dec 2007 Location: New Zealand Photos: Gallery \| Albums Posts: 440 Original Poster	Yes those charts, direct link for them is here: http://www.k10dbook.com/newchart.pdf If you have a more sturdy paper it would be a help. I've only had the K20D prior to this, but I hear lots of chatter about the K5/Kx front focusing in tungsten lighting that was making people wild - just how much i'm not sure. I only have one true tungsten light left (my porch, hence the brick pattern background for tungsten lol) and its literally freezing out so no more testing from me tonight! All my others are energysavers. I must say though, I would be surprised if this glitch still occurred after the re-working of AF detect in the camera. Last edited by FruitLooPs; 07-10-2012 at 02:33 AM.

07-10-2012, 04:41 AM	#5
Pheo Veteran Member Join Date: Nov 2006 Location: Brighton, United Kingdom Photos: Gallery Posts: 311	I'm going to have to find a tungsten bulb. Could be challenging, they're stopping producing them in the EU! I suppose that is one way of solving the tungsten issue!

07-10-2012, 05:33 AM	#7
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Thanks to each of you guys!

07-10-2012, 11:28 AM	#8
SteveB Veteran Member Join Date: Mar 2007 Location: U.K. Posts: 685	Was this done using a tripod or something solid as a camera base? With hand-held it's so easy to move a bit after getting a focus lock. They look quite close to dead right viewed full size.

07-10-2012, 11:54 AM - 1 Like	#9
chiane Senior Member Join Date: Feb 2011 Location: Chicago, IL Photos: Gallery Posts: 170	Can someone summarize what the results are? Every time I look at people shooting charts and brick walls, my eyes cross and my brain shuts off.

07-10-2012, 12:44 PM	#10
Deimos Site Supporter Join Date: Oct 2010 Location: Kingdom of Wonder Posts: 1,777	Originally posted by chiane Can someone summarize what the results are? Every time I look at people shooting charts and brick walls, my eyes cross and my brain shuts off. looks like there is still some front focusing, but not to the point where you would likely miss focus (with that lens), need to see it with a f1.4-2.0 really as thats where you are going to have issues but nice test

07-10-2012, 01:48 PM	#11
FruitLooPs Veteran Member Join Date: Dec 2007 Location: New Zealand Photos: Gallery \| Albums Posts: 440 Original Poster	Originally posted by SteveB Was this done using a tripod or something solid as a camera base? With hand-held it's so easy to move a bit after getting a focus lock. They look quite close to dead right viewed full size. 1st is tripod indoors, second on a stack of books. Shouldn't be any movement. This lens also has quite a bit of correction adjustment applied to it (-7) so I too would like to see another lens tested like F2.8 The chart is flimsy though, so if the front section is bowed slightly outward in one and inward in the other that could influence results etc. Not ideal, but better than nothing - like I said i'm not sure if the K5 was out by like 20cm in low tungsten light or not, if it is then you can probably safely say this isn't an issue.

07-10-2012, 03:21 PM	#12
Pheo Veteran Member Join Date: Nov 2006 Location: Brighton, United Kingdom Photos: Gallery Posts: 311	Hi Guys, Sorry this is on my todo list but had to work late. Will try to get to it tomorrow.

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07-10-2012, 04:20 PM	#13
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285	Originally posted by Pheo Hi Guys, Sorry this is on my todo list but had to work late. Will try to get to it tomorrow. What!? Work before doing our bidding! What is this world coming to!>!

07-10-2012, 11:15 PM	#14
deadwolfbones Veteran Member Join Date: Sep 2007 Location: La Crescenta, CA Posts: 7,450	Hey guys. I've only had a K-30 in my possession for a few hours now, but I've taken a few BS SOOC JPEG shots in very dim light here in my office area this evening. The room is currently lit by 2 CFL bulbs under shades (don't actually have any tungsten in my house). Both with the FA 43 Limited wide open (f/1.9): ISO 3200, 1/20sec (click for full size) ISO 3200, 1/50sec (click for full size) Less useful than a focusing chart, but the accuracy looks superb to my eye. Very pleased over here. Didn't take long to focus, either.

07-10-2012, 11:17 PM	#15
deadwolfbones Veteran Member Join Date: Sep 2007 Location: La Crescenta, CA Posts: 7,450	And just for kicks, here's one in natural light earlier today: f/2.2, ISO 100, 1/2000sec