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<blockquote data-quote="Vincent" data-source="post: 391014" data-attributes="member: 15675"><p>A practical application of this.</p><p>I have the impression that the Sony A7 II is of no use for me, I have to stay with my idea to get better ISO performance, let us reason in stops.</p><p></p><p>Sony A7 II</p><p>IBIS 4.5 stops improvement on the shutter speed.</p><p>ISO 6400 (DXO Mark Dynamic Range EV score of 8 for the original A7)</p><p>24 Mpix</p><p></p><p>better ISO: Sony A7s</p><p>ISO 51200 (that is 3 stops better then the A7 II)</p><p>12 Mpix</p><p>========================</p><p>So in overall the A7 II is better due to better resolution and system that makes you gain more stops (1.5 more).</p><p>If I want to take a picture with a 50mm I can do 1/2s schutter time hand held normally with good results, with a bit of technique even slower.</p><p></p><p>Now the A7s has only 12 Mpix, but the strength is that it shows good 12 Mpix at high ISO.</p><p></p><p>Take a scene which needs flash: 5EV Night home interiors, average light. School or church auditoriums. Subjects lit by campfires or bonfires. </p><p>Can you do something without flash with this new technology?</p><p>We start from daylight 15EV 1/1000s ISO 200 f5.6.</p><p>There is gain of 10 EV needed, we go down to f2.8 so 8EV left to gain.</p><p></p><p>A7 II: 1/3s ISO 200 f2.8 would be possible and give the picture with a 50mm;</p><p>clearly I might choose f5.6 ISO 6400 1/30 s to be able to handle a little movement and have more DOF.</p><p></p><p>A7s: 1/250s ISO 12800 f2.8 is well possible according to most reports</p><p>Clearly I might want to choose: ISO 51200 f5.6 1/250s for a high shutter speed with more DOF.</p><p></p><p>So now it depends what you want to do.</p><p>The A7 II is good for a choir concert ,if their song is not too energetic.</p><p>I`ll probably be in a ruin looking at a birds nest with a telephoto and for me the A7 II will be useless at 1/30s, obviously a Df or D3s will do better for me, since the shutter speed is higher due to the stops gained in ISO and not in slower shutter speed.</p></blockquote><p></p>
[QUOTE="Vincent, post: 391014, member: 15675"] A practical application of this. I have the impression that the Sony A7 II is of no use for me, I have to stay with my idea to get better ISO performance, let us reason in stops. Sony A7 II IBIS 4.5 stops improvement on the shutter speed. ISO 6400 (DXO Mark Dynamic Range EV score of 8 for the original A7) 24 Mpix better ISO: Sony A7s ISO 51200 (that is 3 stops better then the A7 II) 12 Mpix ======================== So in overall the A7 II is better due to better resolution and system that makes you gain more stops (1.5 more). If I want to take a picture with a 50mm I can do 1/2s schutter time hand held normally with good results, with a bit of technique even slower. Now the A7s has only 12 Mpix, but the strength is that it shows good 12 Mpix at high ISO. Take a scene which needs flash: 5EV Night home interiors, average light. School or church auditoriums. Subjects lit by campfires or bonfires. Can you do something without flash with this new technology? We start from daylight 15EV 1/1000s ISO 200 f5.6. There is gain of 10 EV needed, we go down to f2.8 so 8EV left to gain. A7 II: 1/3s ISO 200 f2.8 would be possible and give the picture with a 50mm; clearly I might choose f5.6 ISO 6400 1/30 s to be able to handle a little movement and have more DOF. A7s: 1/250s ISO 12800 f2.8 is well possible according to most reports Clearly I might want to choose: ISO 51200 f5.6 1/250s for a high shutter speed with more DOF. So now it depends what you want to do. The A7 II is good for a choir concert ,if their song is not too energetic. I`ll probably be in a ruin looking at a birds nest with a telephoto and for me the A7 II will be useless at 1/30s, obviously a Df or D3s will do better for me, since the shutter speed is higher due to the stops gained in ISO and not in slower shutter speed. [/QUOTE]
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