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Moon Test - K-x vs K20D · 05:09 PM

Just for comparison. The time on the K-x was supposed to be 1/125th instead of 1/90th.

Barnster · 12-03-2009, 05:42 PM

Well by test the K-x seems to be an overall clearer image at 800 than the K20d at 400.Did you take a image with iso 400 on the K-x,just to see if that image is even better again?Also the K20D looks like it's on the bluer side of the whiteness compared to the K-x image.

**Ash** · 12-03-2009, 05:50 PM

Both look fine to me, other than the K20D's moon is bigger than that of the K-x's.

Barnster · 12-03-2009, 06:00 PM

Originally posted by Ash

Both look fine to me, other than the K20D's moon is bigger than that of the K-x's.

Maybe that could be the difference in the overall image,the cropping!If you crop one in more then the other,then you can't really make a proper judgement on the two.But as I said the first time,what you have posted,the K-x quality looks better.Get the moons cropped equally and on the same iso's aswell.

HogRider · 12-03-2009, 06:04 PM

They have been resized by the same amount. The K20D is bigger because the sensor is bigger. Both were taken with the same lens at 600mm.

**Ash** · 12-03-2009, 06:06 PM

How much bigger is the K20D's sensor? I never thought about sensor size differences between APS-C cams.

HogRider · 12-03-2009, 06:22 PM

Not in physical size but in screen pixels.

K-x 4288 x 2848
K20D 4672 x 3104

**Ash** · 12-03-2009, 06:27 PM

Gotcha.
I knew the difference in resolution but not in sensor size.
Cheers.

Barnster · 12-03-2009, 06:32 PM

Well if that's the case then I'll cancel my second comment and return to the first!!!!!!!!!!

mithrandir · 12-03-2009, 06:56 PM

Regardless, wouldn't a genuine comparison require two equal sized images?

Barnster · 12-05-2009, 03:21 AM

Originally posted by mithrandir

Regardless, wouldn't a genuine comparison require two equal sized images?

That's what I thought,but it's the different sensor size that causes the size difference in the moons,so I won't argue with that.

ytterbium · 12-05-2009, 04:03 AM

What's with the equal shutter speeds at different iso's?
Are the sensitivities wrong, or you just changed aperture or pushed in post process?
Why it is K20D-x?

Pretty moon capture btw.. it feels very..hmm.. round or spherical i'd say, nice.

niklas · 12-05-2009, 05:05 AM

Do you have 2 similar lenses of that Vivitar model since both photos are taken at the exact same time with the exact same lens?

Niklas

JohnBee · 12-05-2009, 05:25 AM

Originally posted by Ash

How much bigger is the K20D's sensor? I never thought about sensor size differences between APS-C cams.

K20 14.6Mp Sensor size:23.4 x 15.6mm
K-x 12.4Mp Sensor size:23.6 x 15.8mm

HogRider · 12-05-2009, 08:49 AM

Originally posted by ytterbium

What's with the equal shutter speeds at different iso's?
Are the sensitivities wrong, or you just changed aperture or pushed in post process?
Why it is K20D-x?

Pretty moon capture btw.. it feels very..hmm.. round or spherical i'd say, nice.

I adjusted brightness in post processing to give them about the same amount of brightness for viewing. The K20D-x is a typo.

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12-03-2009, 05:42 PM	#2
Barnster Veteran Member Join Date: Jun 2009 Location: Mid North Coast,Australia Photos: Gallery Posts: 1,016	Well by test the K-x seems to be an overall clearer image at 800 than the K20d at 400.Did you take a image with iso 400 on the K-x,just to see if that image is even better again?Also the K20D looks like it's on the bluer side of the whiteness compared to the K-x image.

12-03-2009, 05:50 PM	#3
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Both look fine to me, other than the K20D's moon is bigger than that of the K-x's.

12-03-2009, 06:00 PM	#4
Barnster Veteran Member Join Date: Jun 2009 Location: Mid North Coast,Australia Photos: Gallery Posts: 1,016	Originally posted by Ash Both look fine to me, other than the K20D's moon is bigger than that of the K-x's. Maybe that could be the difference in the overall image,the cropping!If you crop one in more then the other,then you can't really make a proper judgement on the two.But as I said the first time,what you have posted,the K-x quality looks better.Get the moons cropped equally and on the same iso's aswell.

12-03-2009, 06:04 PM	#5
HogRider Veteran Member Join Date: Sep 2006 Location: Arizona, USA Photos: Gallery Posts: 608 Original Poster	They have been resized by the same amount. The K20D is bigger because the sensor is bigger. Both were taken with the same lens at 600mm.

12-03-2009, 06:06 PM	#6
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	How much bigger is the K20D's sensor? I never thought about sensor size differences between APS-C cams.

12-03-2009, 06:22 PM	#7
HogRider Veteran Member Join Date: Sep 2006 Location: Arizona, USA Photos: Gallery Posts: 608 Original Poster	Not in physical size but in screen pixels. K-x 4288 x 2848 K20D 4672 x 3104

12-03-2009, 06:27 PM	#8
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Gotcha. I knew the difference in resolution but not in sensor size. Cheers.

12-03-2009, 06:32 PM	#9
Barnster Veteran Member Join Date: Jun 2009 Location: Mid North Coast,Australia Photos: Gallery Posts: 1,016	Well if that's the case then I'll cancel my second comment and return to the first!!!!!!!!!!

12-03-2009, 06:56 PM	#10
mithrandir Veteran Member Join Date: Nov 2007 Location: Maryland Photos: Gallery Posts: 1,895	Regardless, wouldn't a genuine comparison require two equal sized images?

12-05-2009, 03:21 AM	#11
Barnster Veteran Member Join Date: Jun 2009 Location: Mid North Coast,Australia Photos: Gallery Posts: 1,016	Originally posted by mithrandir Regardless, wouldn't a genuine comparison require two equal sized images? That's what I thought,but it's the different sensor size that causes the size difference in the moons,so I won't argue with that.

12-05-2009, 04:03 AM	#12
ytterbium Veteran Member Join Date: Jan 2008 Posts: 1,076	What's with the equal shutter speeds at different iso's? Are the sensitivities wrong, or you just changed aperture or pushed in post process? Why it is K20D-x? Pretty moon capture btw.. it feels very..hmm.. round or spherical i'd say, nice.

12-05-2009, 05:05 AM	#13
niklas Junior Member Join Date: May 2009 Photos: Gallery Posts: 35	Do you have 2 similar lenses of that Vivitar model since both photos are taken at the exact same time with the exact same lens? Niklas

12-05-2009, 05:25 AM	#14
JohnBee Veteran Member Join Date: Sep 2008 Location: Newrfoundland Photos: Albums Posts: 4,667	Originally posted by Ash How much bigger is the K20D's sensor? I never thought about sensor size differences between APS-C cams. K20 14.6Mp Sensor size:23.4 x 15.6mm K-x 12.4Mp Sensor size:23.6 x 15.8mm

12-05-2009, 08:49 AM	#15
HogRider Veteran Member Join Date: Sep 2006 Location: Arizona, USA Photos: Gallery Posts: 608 Original Poster	Originally posted by ytterbium What's with the equal shutter speeds at different iso's? Are the sensitivities wrong, or you just changed aperture or pushed in post process? Why it is K20D-x? Pretty moon capture btw.. it feels very..hmm.. round or spherical i'd say, nice. I adjusted brightness in post processing to give them about the same amount of brightness for viewing. The K20D-x is a typo.

Night Moon Test - K-x vs K20D

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