Phoblographer: K-5 vs. Sony A77 "ISO : Torture Test"

Alizarine · 06-06-2012, 09:13 AM

ISO Torture Test: Sony A77 vs Pentax K-5

Well well well, the K-5 still wins (according to ^ this site)

(oops wrong title, if possible please rename it to "ISO Torture test") thanks!

Anvh · 06-06-2012, 09:42 AM

Not so surprising because of the handicap sony has because of the fixed mirror, so while 100% of the light hits the K5 only 2/3 of the light hits the sensor in the sony camera.

Beside that comparing pixel vs pixel is not really fair, what happen if they resized the A77 photo to match the size of the K5.

RonHendriks1966 · 06-06-2012, 10:36 AM

No surprize that the K-5 is the better camera!

GlennG · 06-06-2012, 11:58 AM

Originally posted by Anvh

only 2/3 of the light hits the sensor in the sony camera.

Only 2/3? Wow, I was led to believe from Sony's ads that only a very tiny amount gets reflected by the mirror. I don't consider 1/3 a tiny amount. I have wondered how much really does go through. I had guessed about 90% hits the sensor. I see some really unique tricks that Sony is up to with the pellicle mirror approach, and they should get some positive credit for their work; however, I've not been too attracted to this technology yet, mostly because it is taking some light away from the sensor.

Anvh · 06-06-2012, 01:06 PM

Was a bit wrong it's 30% not 33%

Sony Alpha SLT-A77 Camera - Initial Test

Quote:

The translucent mirror design has two main drawbacks, both related to its fixed transmission / reflection ratio. It requires use of an electronic viewfinder, since only 30% of incoming light is reflected by the mirror, and so a true optical viewfinder would be unusably dim. Also, with only 70% of incoming light received by the image sensor, Sony's SLT-series cameras aren't able to offer equal sensitivity / noise performance characteristics of a traditional SLR using the same sensor and image processing.

kenafein · 06-06-2012, 02:44 PM

The SLT does have some advantages but, for low light, when you are trying to keep the shutter speed as high as you can, the disadvantages can ruin a shot.

Alizarine · 06-06-2012, 07:17 PM

While the SLT really is disadvantageous against traditional SLRs in low-light, what I'm impressed with the K-5 is that it's being compared here to 2012 technology. Of course the A77 has been developed probably a year or two ago but same goes with K-5, even further back. For some reason SLT technology is not progressing as much as I expected vs. Pentax's current setup.

More K-5 love! lol....

06-06-2012, 09:13 AM	#1
Alizarine Veteran Member Join Date: Dec 2010 Location: Manila Photos: Gallery \| Albums Posts: 2,185	Phoblographer: K-5 vs. Sony A77 "ISO : Torture Test" ISO Torture Test: Sony A77 vs Pentax K-5 Well well well, the K-5 still wins (according to ^ this site) (oops wrong title, if possible please rename it to "ISO Torture test") thanks!

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06-06-2012, 09:42 AM	#2
Anvh Veteran Member Join Date: Sep 2011 Posts: 4,616	Not so surprising because of the handicap sony has because of the fixed mirror, so while 100% of the light hits the K5 only 2/3 of the light hits the sensor in the sony camera. Beside that comparing pixel vs pixel is not really fair, what happen if they resized the A77 photo to match the size of the K5.

06-06-2012, 10:36 AM	#3
RonHendriks1966 Banned Join Date: Jan 2009 Photos: Gallery Posts: 9,675	No surprize that the K-5 is the better camera!

06-06-2012, 11:58 AM	#4
GlennG Veteran Member Join Date: Aug 2010 Location: Houston, Texas Posts: 824	Originally posted by Anvh only 2/3 of the light hits the sensor in the sony camera. Only 2/3? Wow, I was led to believe from Sony's ads that only a very tiny amount gets reflected by the mirror. I don't consider 1/3 a tiny amount. I have wondered how much really does go through. I had guessed about 90% hits the sensor. I see some really unique tricks that Sony is up to with the pellicle mirror approach, and they should get some positive credit for their work; however, I've not been too attracted to this technology yet, mostly because it is taking some light away from the sensor.

06-06-2012, 01:06 PM	#5
Anvh Veteran Member Join Date: Sep 2011 Posts: 4,616	Was a bit wrong it's 30% not 33% Sony Alpha SLT-A77 Camera - Initial Test Quote: The translucent mirror design has two main drawbacks, both related to its fixed transmission / reflection ratio. It requires use of an electronic viewfinder, since only 30% of incoming light is reflected by the mirror, and so a true optical viewfinder would be unusably dim. Also, with only 70% of incoming light received by the image sensor, Sony's SLT-series cameras aren't able to offer equal sensitivity / noise performance characteristics of a traditional SLR using the same sensor and image processing.

06-06-2012, 02:44 PM	#6
kenafein Veteran Member Join Date: May 2011 Location: Southern California Photos: Albums Posts: 4,082	The SLT does have some advantages but, for low light, when you are trying to keep the shutter speed as high as you can, the disadvantages can ruin a shot.

06-06-2012, 07:17 PM	#7
Alizarine Veteran Member Join Date: Dec 2010 Location: Manila Photos: Gallery \| Albums Posts: 2,185 Original Poster	While the SLT really is disadvantageous against traditional SLRs in low-light, what I'm impressed with the K-5 is that it's being compared here to 2012 technology. Of course the A77 has been developed probably a year or two ago but same goes with K-5, even further back. For some reason SLT technology is not progressing as much as I expected vs. Pentax's current setup. More K-5 love! lol....