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Official: Sony A7 and A7R Fullframe Mirrorless
  
 
miklar
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p.156 #1 · Official: Sony A7 and A7R Fullframe Mirrorless


Video capabilities of the A7r

Anyone who is interested in the video capabilities of the A7r may find the following links enlightening:

https://vimeo.com/83029048
https://vimeo.com/81904208

Philip Boom the DP, Director, Filmmaker soon will be providing his review of how the A7r compares...
You may have to copy and paste the links to get to the video files.
Cheers



Jan 05, 2014 at 06:19 PM
carstenw
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p.156 #2 · Official: Sony A7 and A7R Fullframe Mirrorless


s/^https/http/

http://vimeo.com/83029048
http://vimeo.com/81904208



Jan 05, 2014 at 07:52 PM
michaelwatkins
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p.156 #3 · Official: Sony A7 and A7R Fullframe Mirrorless


http://newcameranews.com/2014/01/05/sony-a7r-causing-strange-new-feelings-in-pants/




Jan 05, 2014 at 08:58 PM
miklar
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p.156 #4 · Official: Sony A7 and A7R Fullframe Mirrorless


carstenw wrote:
s/^https/http/

http://vimeo.com/83029048
http://vimeo.com/81904208


Thanks, I'll try and remember that



Jan 05, 2014 at 09:05 PM
dovey
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p.156 #5 · Official: Sony A7 and A7R Fullframe Mirrorless


I am having an issue with the histogram on the A7R. It does not give me any indication of clipping, only a curve.
I was hoping to be able to use the histogram to help with metering, however this is not working.
I am shooting in M mode, using Contax lenses with aperture control. The only way I can tell if I am clipping currently is to watch the iso, if this drops to 100 on Autoiso it suggests that I am overexposing.



Jan 05, 2014 at 09:10 PM
miklar
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p.156 #6 · Official: Sony A7 and A7R Fullframe Mirrorless


dovey wrote:
I am having an issue with the histogram on the A7R. It does not give me any indication of clipping, only a curve.
I was hoping to be able to use the histogram to help with metering, however this is not working.
I am shooting in M mode, using Contax lenses with aperture control. The only way I can tell if I am clipping currently is to watch the iso, if this drops to 100 on Autoiso it suggests that I am overexposing.


Try turning on "Zebra" and see if that will help...
It's located under "custom settings" > 1 > Zebra, and can be set to show overblown sections of an image by percentage.
Cheers

Edited on Jan 05, 2014 at 09:33 PM · View previous versions



Jan 05, 2014 at 09:29 PM
carstenw
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p.156 #7 · Official: Sony A7 and A7R Fullframe Mirrorless


miklar wrote:
Thanks, I'll try and remember that


Fred's site doesn't like https links for some reason.



Jan 05, 2014 at 09:30 PM
ct8282
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p.156 #8 · Official: Sony A7 and A7R Fullframe Mirrorless


Quick question peeps. Can you adjust the amount of zoom during image playback when you press the C2 zoom button. Currently it zooms to 100% and then I have spend ages zooming back out to something sensible like 50% so I can review the area of the image I'm interested in. It's becoming quite an irritation.


Jan 05, 2014 at 09:43 PM
philip_pj
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p.156 #9 · Official: Sony A7 and A7R Fullframe Mirrorless


Might have been already posted, I went back only two pages, but this is very enlightening re the 55mm FE - what a lens it is - in 'Most adorable 50s' :

http://3d-kraft.com/index.php?option=com_content&view=article&id=151%3Aadorable-50s-otus-noctilux-summilux-hyperprime-sonnar&catid=40%3Acamerasandlenses&Itemid=2&limitstart=2

"The last weeks we could often read that people are unsatisfied with the border and edge performance of the Summilux(-M 50mm f1.4 ASPH) on the A7/A7R and tried to explain it with edge smearing caused by the sensor. In fact, here it is no edge smearing. Instead it is the result of field curvature as demonstrated with the test charts and the edge focused crops.

The Zeiss FE 1.8/55 delivers an surprisingly good result already at open aperture across the whole image frame and has only very little field curvature...Already at f/2.0 the Zeiss FE 1.8/55 begins to produce moiré in the reproduction of the rastered print..It is an indication that already the resolution of the AA-filterless 36 MP sensor is reached here."

One of the finest things about modern Zeiss is their 'lenses for all seasons and all reasons' approach at affordable prices. Note the comment about the 'Sony smear' re the Summ-M asph also. All very apparent in the MTF chart, for anyone who looked. The 55 FE will be in a lot of people's futures, I suspect, almost a reason to buy into the budding system, all by itself.



Jan 05, 2014 at 10:13 PM
philip_pj
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p.156 #10 · Official: Sony A7 and A7R Fullframe Mirrorless


dovey, the histo is live for the scene, but maybe it's different in M, maybe it cannot keep up? I use A mode based on what I want re DoF/bokeh, then dial in ISO (handy on the spin dial) to get a decent shutter speed if needed. I do this using the live histo. In good light the meter is very close to 'correct', maybe an extra little EC sometimes is needed.

With M I imagine you are using the meter 'exclusively' with the change variable being ISO, using fixed aperture and s/s. If you are getting exposure problems try less (or more on occasions) exposure compensation? I put EC on the more reachable back dial, have no other need for that dial.

I have not used M mode, others can maybe help. The zebra thing seems to intrude too much for me, on specular highlights but also genuine image content, so I do without it. There is a rather good (putting on flame suit here) 450 page a7/r manual on the web which may explain more.



Jan 05, 2014 at 11:03 PM
 

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dovey
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p.156 #11 · Official: Sony A7 and A7R Fullframe Mirrorless


Hi,
I have been amazed at the poor marketing of the Metabones smart adapter. This device is actually quite good, if you get a good copy. I had some issues with the mounting plate, too tight and horrible to take off the lens, however Metabones sent me a replacement plate.
What I was amazed at is how little information Metabones offers. There are two modes for this device, the dumb mode and a smart mode, and you will find no info on their website or in the box. There is no manual or even a diagram.
The adapter is excellent with Canon lenses if you can get the adapter to go into the smart mode. If you have an RX1 you will be familiar with the focus assist that kicks in with DMF, well that is available in MF mode with the Canon lenses and makes them much more useable on this camera than on the Canon cameras in manual mode.
To get this you have to power on the camera body and in MF mode, have the lens attached to the adapter and as be pushing the button on the adapter as you insert it into the camera.
You will find that as you start manual focusing, the camera gives MF assist, that is a great deal of magnification. As well there is a focusing scale.
Bizarre that this makes this system so much better and usable, yet this information is almost impossible to find



Jan 06, 2014 at 11:36 PM
miklar
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p.156 #12 · Official: Sony A7 and A7R Fullframe Mirrorless


A7r Video Review by Philip Bloom

http://philipbloom.net/2014/01/06/a7r/

Click on the 3rd from the bottom video to view his review... It's long



Jan 07, 2014 at 12:29 AM
Taylor Sherman
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p.156 #13 · Official: Sony A7 and A7R Fullframe Mirrorless


miklar wrote:
Try turning on "Zebra" and see if that will help...
It's located under "custom settings" > 1 > Zebra, and can be set to show overblown sections of an image by percentage.
Cheers


I'm not sure zebra is accurate for highlight-clipping. I set it to "100%+" and I would see zebra in scenes where there were no blown highlights -- I'd see the zebra on highlights, take the shot, and then review it, no blown highlights. So, I turned zebra off.




Jan 07, 2014 at 02:10 AM
snapsy
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p.156 #14 · Official: Sony A7 and A7R Fullframe Mirrorless


Wonk Alert! I've done a light transmission test (t-stop) on my A7r for all the 35mm to 50mm lenses I have on hand. The purpose of the test is to see how much light is reached at the sensor when the lenses are wide-open, which accounts both for lens transmission (t-stop) as well as sensor micro-lens transmission loss (DxO Article). This information can be used to make weight/size/price decisions for those considering a purchase of these lenses and wanting the best effective light transmission (ie, best low-light performance).

The test was performed by shooting a raw image of an X-Rite Color Passport, with each lens at the largest aperture supported and the chart centered in the frame to prevent vignetting from affecting the results. All raws were loaded into CS6 with identical white-balance. The Leica Noctilux f/0.95 was used as the reference lens since it is the fastest. The 2nd darkest gray patch on the color chart (3rd patch on top row from left) was sampled in CS6 to obtain the reference luminance. I then loaded the images from the other lenses and adjusted the ACR exposure compensation for each so that the 3rd patch matched the luminance from the Noctilux reference...the delta from reference to the f-stop shows the relative transmission of each lens.

Side note: By comparing the light transmission of the Canon 50L f/1.2 and f/1.4 lenses mounted on a generic EF adapter (no electrical contacts) vs those same lenses mounted on a Metabones Smart Adapter (w/electric contacts, so f/stop data passed to camera), I determined that the A7r does a "silent" ISO gain of .35 stops for f/1.2 and .33 stops for f/1.4. The values in the chart for EF lenses exclude those gains (ie, show the real EV difference).

How to read the chart:
* The "Expected Exp Comp" column shows the expected EV difference between each lens tested vs the Noctilux based on the nominal aperture difference. For example, f/1.2 -> f/1.0 represents 1/2 stop nominal difference. For ease of viewing I've rounded the Noctilux up to f/1.0
* The "ACR Exposure Comp Necessary" column shows how much positive exposure compensation was required to match the brightness of the Noctilux. This value is expected to be less than or equal to the nominal f/stop difference.
* The "EV Diff" shows the exposure compensation necessary vs the expected exposure comp. A positive value indicates that the amount of ACR exposure comp was less than indicated by the nominal f/stop difference. A negative value indicates that the amount of ACR exposure comp was more than indicated by the nominal f/stop difference.

If you want to see the effective transmission difference between two lenses, compare them in the "ACR Exposure Comp Necessary" column. For example, the Sony FE55 @ f/1.8 is 1.30EV darker than the Noctilux @ f/0.95.







Jan 07, 2014 at 03:18 AM
Jeff Kott
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p.156 #15 · Official: Sony A7 and A7R Fullframe Mirrorless


Taylor Sherman wrote:
I'm not sure zebra is accurate for highlight-clipping. I set it to "100%+" and I would see zebra in scenes where there were no blown highlights -- I'd see the zebra on highlights, take the shot, and then review it, no blown highlights. So, I turned zebra off.



Taylor, did you check to make sure Zebra is set to 100%? If it's set to a lower percentage it will show "clipping" before the exposure is blown.



Jan 07, 2014 at 06:06 AM
Luvwine
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p.156 #16 · Official: Sony A7 and A7R Fullframe Mirrorless


FYI I got a shipping notice for my Really Right Stuff A7r L plate today.


Jan 07, 2014 at 06:00 PM
tsdevine
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p.156 #17 · Official: Sony A7 and A7R Fullframe Mirrorless



When did you order if you don't mind me asking?

TIA,
Tim

Luvwine wrote:
FYI I got a shipping notice for my Really Right Stuff A7r L plate today.




Jan 07, 2014 at 06:08 PM
ken.vs.ryu
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p.156 #18 · Official: Sony A7 and A7R Fullframe Mirrorless


carstenw wrote:
s/^https/http/

http://vimeo.com/83029048
http://vimeo.com/81904208


Learned a new term, lens whacking aka free lensing.



Jan 07, 2014 at 07:34 PM
theophilus
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p.156 #19 · Official: Sony A7 and A7R Fullframe Mirrorless


carstenw wrote:
s/^https/http/

http://vimeo.com/83029048
http://vimeo.com/81904208


I love vi.



Jan 07, 2014 at 08:05 PM
snapsy
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p.156 #20 · Official: Sony A7 and A7R Fullframe Mirrorless


ken.vs.ryu wrote:
Learned a new term, lens whacking aka free lensing.


I would recommend against it, particularly on Nikon bodies. It's a great way to bend the aperture lever.



Jan 07, 2014 at 08:06 PM
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