Red and Blue

by Gordon

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3

JPEG is a compressed format so the filesize does not correspond directly to the image resolution, but rather to it's content. The JPEG algorithm achieves lower filesizes with images that contain less detail, so if you have areas with very little detail, such as out of focus backgrounds or blown out skies then that can lead to dramatically smaller filesizes, ...


3

Based on the information you've given so far, I'm not yet convinced there is a problem. Assuming you mean 2-7 MB (Megabytes), not KB (Kilobytes), that file size could be consistent with a full resolution JPEG. 2-7 KB would not actually fit an image, except maybe a tiny thumbnail or icon. Look up the dimension of the image in pixels in your file browser - ...


0

A digital sensor only has ONE sensitivity, its one native sensitivity, probably rated ISO 100 for most DSLR today. All a sensor can do is to collect the light photons hitting its cells. It cannot attract more photons. :) Then basically, all any higher ISO setting can do is to multiply the existing data values, shifting the data up in the histogram, which ...


1

The answer is not that simple, also because of the compression scheme SONY are using. Technically, between ISO 50 and ISO 100 all that is supposed to happen is exposure meter shift, 1 stop. That is, ISO 50 shot is supposed to be ISO 100 shot overexposed by 1 stop, just as Mr. Grum wrote. However if one starts to split hairs and perform noise measurements, ...


1

They have lower level of noise, but also a lower ceiling for highlights. ISO 50 is effectively doing ETTR and then scaling back a stop. Whether or not the ceiling for highlights has been reduced too much is up to the scene and what you're trying to do.


6

ISOs lower than 100 on the A7 are not "real" in the sense that they don't lower the gain on the sensor, they just instruct the camera to increase exposure time as if the sensitivity was lower. The net result of this is reduced highlight headroom. If you shoot RAW there is nothing really to be gained from any ISO setting less than 100.


0

I have a D610 and a NEX 5R, so I'm in a similar situation. Just buy the cheapest adapter that has mechanical aperture control for G lenses. Forget about autofocus; even if you find the most expensive adapter that allows autofocus, it would not be very good. The beauty of Sony E bodies is the full-time LiveView AND the really nicely implemented focus ...


2

These are video cameras, but the basic principle is the same as with still cameras: the FDR-AX100 has a much larger sensor. It is a 1" type, while the FDR-AX33 has 1/2.3" type sensor. (These formats are common in still cameras too, with the 1/2.3" size being prevalent in compact point and shoots and 1" becoming more common in higher-end compacts and a few ...


5

This could be due to either the angular dependence of image pixels or the design (level of offsetting) in the microlenses. If you imagine an image pixel as a bucket with the light sensitive part in the bottom, light coming from directly above will hit the bottom with no problems. However the more oblique the angle of light the less will hit the bottom as it ...



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