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padam

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Posts posted by padam

  1. 7 hours ago, kye said:

    If anyone is comparing lenses, be aware that one of the advantages of having a fast lens is that you can stop down and get less distortion.  For example, if you get a 50mm F1.4 and use it at 1.8 then it is likely to be optically superior to the 50mm 1.8 at 1.8.

    This is why people would buy a 1.2 lens in comparison to an 1.4 lens - it's not because they want to shoot a lot at 1.2, it's the performance at 1.4 or 1.8.

    That's actually not true, maybe it is sometimes, but is it mainly dependent on the optical design itself. Oh, and the glass looks a bit fancier both on the specs sheet and in real life... I am sure Sigma could make even better f/2 ART prime lenses for instance, but people would just say 'meh, too expensive but not faster'.

    Generally speaking, you can design a much higher resolving lens (especially in the corners) with lower geometric distortion and far less aberrations by opting to use a slower aperture (the increase going into extreme F-stops is actually monumental). The vignetting might be more significant, but that can be corrected. This is exactly why they went with f/1.8 Z primes instead of faster. Other casing point is the Leica 50/2 APO, which still sets the benchmark (although all the rest they made is not far off in absolute terms).

    It will be interesting to see what the 58mm f0.95 can do.

    I have to say, while the 35mm f/1.8 looks very sharp, I don't find the rendering anything special in these early samples. Only seen thumbnails from the 50mm f/1.8 so far.

  2. You can find A9 video comparisons on YT, but here is one:

    You can see the exact same stretching.

     

    So in conclusion, this is how the computation works in the current FF cameras capable of 6k readout and it is not going to be "fixed'.

    I'm pretty sure that the A7SIII will have less megapixels so the internal downsampling won't be pushed to its limits. But for 4k60p they may need to upgrade the codec and processing to be able to handle that (maybe with an external recorder, but probably 8-bit 4:2:2 limited).

  3. I like the argument about which camera brand is better when in fact it's been laid out that they all have their marketing strategies and other different methods of milking the customers.

    And they won't care what happens in the forums, they care more about global sales and maybe each other (for instance the C100II would not have received price drops if the FS5 was not released and so on...)

    Yes Pro features codecs etc. will eventually come down to a lower level. But much later than people expect.

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