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FORUMS Sony Cameras, Lenses & Accessories Sony Cameras 
Thread started 05 Dec 2017 (Tuesday) 05:02
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3 questions on a7r3

 
ccp900
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Dec 05, 2017 05:02 |  #1

hi guys

need help answering the following questions

1) how many uncompressed a7r3 raw stills can fit in a single 64gb card and 128gb card

2) can the a7r3 uhs2 slot use a uhs1 card and can the uhs1 slot use a uhs2 card. aware that the performance won't be the best and might sound funny if I actually put in a uhs2 card in the wrong slot but I just wanted to know if it will actually work. the 2 card in the 1 slot and the 1 card in the 2 slot

3) can the original a7s eyepiece fit on the a7r3?

4) here's the biggie question

the reason I moved from an apsc 7d to a full frame a7s is because of iso performance. if i remember correctly apsc sensors capture the image let's say on iso 100 but because they actually have a smaller physical size they actually gather less light BUT because iso 100 needs to be a certain brightness due to the iso standards, the camera then needs to brighten the picture post capture. this leads to increased noise levels perceived. Now if I have an a7s or a7r3 and I mount let's say a 10 to 18 e mount for apsc. then I shift it to apsc mode. will i be right that the brightness of the image captured will not be altered by the camera making an iso 100 capture a real iso 100 capture?

I hope I made sense


[Sony A7R Mark 3 | Sony A7S | Sony Zeiss 16-35m f/4.0 | Sony FE 28m f2 | Sony Zeiss 55m f1.8 | Sony FE 28-70m f/3.5-5.6 | Helios 44-2 | Helios 44-3 | Nikon 105m f/2.5 AIS | Contax Zeiss Planar 50m f1.7 | Contax Zeiss Planar 100m f2 | Voigtlander Nokton 40m f/1.4 | Canon 24-105m f/4.0L | Canon 85m f/1.8 | Sigma 30m f/1.4 | Canon 10-22m f/3.5-4.5 | Canon 100m f/2.8 Macro USM | Canon 580 EX Ver 1.0]

  
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ccp900
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Dec 05, 2017 05:32 |  #2

I'm sorry I realized I actually had 4 questions hehe. I started with only 3 but thought of 1 more while typing hehehhe


[Sony A7R Mark 3 | Sony A7S | Sony Zeiss 16-35m f/4.0 | Sony FE 28m f2 | Sony Zeiss 55m f1.8 | Sony FE 28-70m f/3.5-5.6 | Helios 44-2 | Helios 44-3 | Nikon 105m f/2.5 AIS | Contax Zeiss Planar 50m f1.7 | Contax Zeiss Planar 100m f2 | Voigtlander Nokton 40m f/1.4 | Canon 24-105m f/4.0L | Canon 85m f/1.8 | Sigma 30m f/1.4 | Canon 10-22m f/3.5-4.5 | Canon 100m f/2.8 Macro USM | Canon 580 EX Ver 1.0]

  
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pyrospawn
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Post edited 8 months ago by pyrospawn. (2 edits in all)
     
Dec 05, 2017 10:57 |  #3

Can't answer all of the question but....
1) I didn't fill up the whole card shooting yet so can't answer for a fact. Since the a7r iii shares the same sensor as the a7r ii, I would infer (per this post https://www.dpreview.c​om/forums/post/5665345​7) (external link)...
"The uncompressed RAW files are roughly double the size of the approximately 42 MB lossy compressed RAW files. That will be an issue for some but at worst that is still around 750 images on a 64GB card"

2) You can use uhs1 card in ush2 slot and vice versa. They are backward compatible. I had my ush1 card in ush2 slot and it worked fine.


http://www.flickr.com/​photos/pyrospawn/ (external link)
Canon 6D, Canon EF 24-105mm f/4 L IS, Canon EF 70-200mm f/2.8L IS, Canon EF 100mm f/2.8L IS Macro, Canon EF-S 10-22mm f/3.5-4.5 (modded for full frame), Canon EF 50mm f/1.8 II, Rokinon FE14M-C 14mm F2.8, Canon MR-14EX Macro Ring Lite

  
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yellowt2
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Dec 05, 2017 12:20 |  #4

ccp900 wrote in post #18510944 (external link)
the reason I moved from an apsc 7d to a full frame a7s is because of iso performance. if i remember correctly apsc sensors capture the image let's say on iso 100 but because they actually have a smaller physical size they actually gather less light BUT because iso 100 needs to be a certain brightness due to the iso standards, the camera then needs to brighten the picture post capture. this leads to increased noise levels perceived. Now if I have an a7s or a7r3 and I mount let's say a 10 to 18 e mount for apsc. then I shift it to apsc mode. will i be right that the brightness of the image captured will not be altered by the camera making an iso 100 capture a real iso 100 capture?

I hope I made sense

I don't think your reasoning is really correct, although it's a little hard to follow. At ISO 100 the APS-C needs the same intensity of light as a full-frame sensor for a proper exposure. Using an A7s or A7R3 in APS-C mode does not change the ISO sensitivity; you just get fewer pixels in the final image because it only uses part of the sensor. The camera doesn't alter the image brightness due to being in APS-C mode; an ISO 100 capture is always an ISO 100 capture.

Basically taking a picture in APS-C mode will give the exact same exposure (brightness) as taking the same picture in full-frame mode (given the same aperture, shutter speed and ISO), you'll just get fewer pixels in your picture.




  
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ccp900
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Dec 06, 2017 03:03 as a reply to  @ yellowt2's post |  #5

hi yellowt2. Thank you for your reply. I'm sorry I wasn't able to explain better. hopefully this link might help

https://m.dpreview.com …e-and-why-should-i-care/2 (external link)

please go to the section on total light equivalence.

here's a video by Tony Northrup on the same topic

https://m.youtube.com …re=youtu.be&v=D​tDotqLx6nA (external link)

so this is how I understand it. iso provides a standard that dictates how bright a picture should be given a specific exposure or a specific combination of shutter speed and aperture. so if we take for example a 50mm lens with a maximum aperture of f2. if you mount that lens on a full frame camera the amount of light gathered by the lens let's say at shutter speed 1/500 and aperture of f2 will be bigger than the amount of light gathered by an apsc camera with the exact same lens and aperture settings. BUT here's the problem. ISO standards demand that a certain brightness value needs to happen at iso 100 but since the apsc camera was not able to gather the exact same amount of light the camera amplifies the photo so that the brightness equates to the standard.

this amplification results to a degraded image quality such that an iso 100 image taken by an apsc looks like a photo taken at iso 225 by a full frame camera

I hope this is a bit clearer


[Sony A7R Mark 3 | Sony A7S | Sony Zeiss 16-35m f/4.0 | Sony FE 28m f2 | Sony Zeiss 55m f1.8 | Sony FE 28-70m f/3.5-5.6 | Helios 44-2 | Helios 44-3 | Nikon 105m f/2.5 AIS | Contax Zeiss Planar 50m f1.7 | Contax Zeiss Planar 100m f2 | Voigtlander Nokton 40m f/1.4 | Canon 24-105m f/4.0L | Canon 85m f/1.8 | Sigma 30m f/1.4 | Canon 10-22m f/3.5-4.5 | Canon 100m f/2.8 Macro USM | Canon 580 EX Ver 1.0]

  
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ccp900
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Dec 06, 2017 03:03 |  #6

pyrospawn wrote in post #18511153 (external link)
Can't answer all of the question but....
1) I didn't fill up the whole card shooting yet so can't answer for a fact. Since the a7r iii shares the same sensor as the a7r ii, I would infer (per this post https://www.dpreview.c​om/forums/post/5665345​7) (external link)...
"The uncompressed RAW files are roughly double the size of the approximately 42 MB lossy compressed RAW files. That will be an issue for some but at worst that is still around 750 images on a 64GB card"

2) You can use uhs1 card in ush2 slot and vice versa. They are backward compatible. I had my ush1 card in ush2 slot and it worked fine.

thank you Pyro!


[Sony A7R Mark 3 | Sony A7S | Sony Zeiss 16-35m f/4.0 | Sony FE 28m f2 | Sony Zeiss 55m f1.8 | Sony FE 28-70m f/3.5-5.6 | Helios 44-2 | Helios 44-3 | Nikon 105m f/2.5 AIS | Contax Zeiss Planar 50m f1.7 | Contax Zeiss Planar 100m f2 | Voigtlander Nokton 40m f/1.4 | Canon 24-105m f/4.0L | Canon 85m f/1.8 | Sigma 30m f/1.4 | Canon 10-22m f/3.5-4.5 | Canon 100m f/2.8 Macro USM | Canon 580 EX Ver 1.0]

  
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yellowt2
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Dec 11, 2017 11:59 |  #7

ccp900 wrote in post #18511699 (external link)
hi yellowt2. Thank you for your reply. I'm sorry I wasn't able to explain better. hopefully this link might help

https://m.dpreview.com …e-and-why-should-i-care/2 (external link)

please go to the section on total light equivalence.

here's a video by Tony Northrup on the same topic

https://m.youtube.com …re=youtu.be&v=D​tDotqLx6nA (external link)

so this is how I understand it. iso provides a standard that dictates how bright a picture should be given a specific exposure or a specific combination of shutter speed and aperture. so if we take for example a 50mm lens with a maximum aperture of f2. if you mount that lens on a full frame camera the amount of light gathered by the lens let's say at shutter speed 1/500 and aperture of f2 will be bigger than the amount of light gathered by an apsc camera with the exact same lens and aperture settings. BUT here's the problem. ISO standards demand that a certain brightness value needs to happen at iso 100 but since the apsc camera was not able to gather the exact same amount of light the camera amplifies the photo so that the brightness equates to the standard.

this amplification results to a degraded image quality such that an iso 100 image taken by an apsc looks like a photo taken at iso 225 by a full frame camera

I hope this is a bit clearer

You're kind of mixing two different things.
1. Full-frame sensors do receive more total light than APS-C sensors, and when looking at similar generations of sensors the full-frame sensor will have better image quality. This is not necessarily true across generations (a brand new APS-C sensor might look better than a 5-year-old full-frame sensor for example, due to a better design).

2. Different sensors use different amplification to bring the image brightness to the ISO standard. This does not depend on sensor size as much as pixel density. Each pixel is essentially its own light sensor, and outputs a voltage based on how much light it receives. A full-frame sensor and APS-C sensor with the same pixel density and sensitivity need to use the same amplification, and will have similar pixel-level image quality. A full-frame sensor and APS-C sensor with the same number of pixels will have different pixel densities, and therefore use different amplification. Also, some sensors have more sensitive pixels than others; in general newer sensor designs are more efficient at receiving light than older designs, and as a result have better image quality.




  
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ccp900
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Dec 11, 2017 14:18 as a reply to  @ yellowt2's post |  #8

Thanks yellowt2. I think I had a more shallow interpretation hehehehe. in my mind given the same generation sensor and the only thing different is the sensor size, the image quality loss is due to the extra amplification being done by the apsc to make sure that the brightness equates the full frame brightness. the full frame one doesn't need this simply because the iso standard is based on the 35mm size.

please forgive the straight forward attack - this might be the reason why we have different takes. I'm not much of a scientist in this area so I went by logic and the simple explanations provided by the links I provided.

there is more to this topic than I can understand hehehehe.


[Sony A7R Mark 3 | Sony A7S | Sony Zeiss 16-35m f/4.0 | Sony FE 28m f2 | Sony Zeiss 55m f1.8 | Sony FE 28-70m f/3.5-5.6 | Helios 44-2 | Helios 44-3 | Nikon 105m f/2.5 AIS | Contax Zeiss Planar 50m f1.7 | Contax Zeiss Planar 100m f2 | Voigtlander Nokton 40m f/1.4 | Canon 24-105m f/4.0L | Canon 85m f/1.8 | Sigma 30m f/1.4 | Canon 10-22m f/3.5-4.5 | Canon 100m f/2.8 Macro USM | Canon 580 EX Ver 1.0]

  
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3 questions on a7r3
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