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Wow ! 40 images ! That's even more than myself (and I'm already flooded with same shots of everything). I find it hard to get more disciplined and to only keep the best ones. How do you manage so many files ? That is a lot of work to sort it all out and then to store the best.Many thanks Annna T...Always happy to answer (sensible) questions as yours is
I tried various EV combinations as the light was getting dimmer...I think I took around 40 images in all!
Thanks for your explanations. I see the challenge. Holding the A7r perfectly still for 4 sec. is quite a performance, even leaning on a barrier.I first started out with a more sensible choice of aperture/shutter speed with a faster ISO and then experimented seeing just how slow I could get the shutter speed down to by simply hand balancing it on top of the fence.
On inspection at home I decided to go with the smooth water image (4 seconds was the maximum I could hold it still).
DPreview has shown that in its review of the A7r. 50 ISO, like on many other cameras is a "fake ISO" : the camera overexpose and boost the shadows afterward. This results in a loss of DR in the highlights. They have issued a graph illustrating that here (look for the last graph at the end of the page).I was unaware that you loose DR at 50 ISO + Surprised that the optimal performance for the A7R sensor is at 200 ISO (I must admit pixel peeping that’s not my experience in daylight). Although I was aware that thermal noise starts coming into play at low EV’s. (I live and learn - Thanks).
I like a clean digital look. May be because I never had a darkroom. I shot several years with film, but used to scan my negs or slides. Digital cameras were a real relief and they made the learning of photography technique so much easier.To be honest I'm not so hung up about "Noise" as some others are here...In my Leica M and R days I used to deliberately enhance the acutance of film grain (Tri-X and TMax 3200) by developing in Agfa Rodinal and making small prints.
That was an interesting read Annna (Thank you once again )...I'm not sure I am any the wiser, perhaps I should do a few tests of my own...I made a few changes to my normal camera settings and will see if I can see any real world difference at the lower ISO's, especially the highlights.DPreview has shown that in its review of the A7r. 50 ISO, like on many other cameras is a "fake ISO" : the camera overexpose and boost the shadows afterward. This results in a loss of DR in the highlights. They have issued a graph illustrating that here (look for the last graph at the end of the page).
I got a little unsure about 200 ISO offering better performance than ISO 100. I used to shoot at ISO100, then read about the 200 ISO being better and switched to ISO200. So I made a little more research and nothing confirms that : ISO100 offers also better DR and lower noise (although the difference is subtile). May be those who propagated the idea that it is better to shoot at ISO200 were taking the higher resolution of the sensor in consideration and pushing for faster speeds. Personnally, not having very steady hands, I tend to prefer ISO200 rather than ISO100.
Here is what I found concerning the variation of DR and noise depending on the ISO used :
DXO data
Sensorgen
This last series of graphs is interesting : contrary to what DPreview states they indicate sligthly better results with ISO50 than ISO100. But the difference is sot subtle as to be negligible. In theory, DPreview should be right, but what Sensorgen found out seems to match what you say.
They are using both DXOmark data and statistical data which they compute using Rawdigger. They extract the data from the raw files using converters like DCRAW, aka they try to get the rawest data possible (not what you get from commercial converters like LR, C1, or DXO, where a ), their only goal is to analyse the pure sensor performance, before any settings are applied. When you open an image in Rawdigger, you get a statistical analysis and a graph instead of a converted picture : it isn't for the faint of heartThat was an interesting read Annna (Thank you once again )...I'm not sure I am any the wiser, perhaps I should do a few tests of my own...I made a few changes to my normal camera settings and will see if I can see any real world difference at the lower ISO's, especially the highlights.
I have included the links for others to see below.
Sensorgen..... Sensorgen.info data for Sony A7R
Dpreview.... Sony Alpha 7R Review: Digital Photography Review
Sony Alpha 7R Review: Digital Photography Review
One of the problems is that Sensorgen don't tell you what the camera settings were that they used and that WOULD affect the results...Their results are totally different (@ 50 ISO) from DPreview's as you say.
Cheers Barry
Thanks again Annna...You have obviously spent much, much more time than me delving into all of this. :salute:They are using both DXOmark data and statistical data which they compute using Rawdigger. They extract the data from the raw files using converters like DCRAW, aka they try to get the rawest data possible (not what you get from commercial converters like LR, C1, or DXO, where a ), their only goal is to analyse the pure sensor performance, before any settings are applied. When you open an image in Rawdigger, you get a statistical analysis and a graph instead of a converted picture : it isn't for the faint of heart
There are some explanations there and links to the results of other cameras/sensors: Sensorgen - digital camera sensor data
There is another website explaining sensor performance : Clarkvision I'm sure it had a page allowing you to compare the performances of different cameras depending on the ISO used, but I couldn't find that page again.
Not a A7 file, but love them massive horns.
Georg, your horn is massive compared to mine! :bugeyes:Not a A7 file, but love them massive horns.