Serguei Palto

Serguei Palto

Joined on Dec 7, 2012

Serguei Palto's recent activity

  • Replied in Why not ..
    Are you so young..:)? I am impressed...!:) Can I open a secret for you?:) Do you know that before a signal is digitized by ADC the number of electrons is converted to a voltage that can be measured ...
  • Replied in Why not ..
    The dark noise can be not only of the pure thermal nature. At very low frequencies of time-domain signal there is so-called 1/f noise that is inversely proportional to the frequency f . It is also ...
  • Replied in Why not ..
    Of course, you are right. Sure, the circuity (converters, amplifyers, ADCs) makes an addititional contribution, and also wiring at sensor surface influences the effective area of photosites (In my ...
  • Replied in Why not ..
    Yes, this is well known. Why you leave this important subject?:) Are you sure? Are the units used to measure are so important? What about if a signal is measured in photons or in Joules? Do you ...
  • Replied in Why not ..
    Anders, you are right in case of the photon noise is dominating. But I am not speaking on situations when the photon noise is the limiting factor. The photon noise is not much interesting in case ...
  • Replied in Why not ..
    No. It would not be equal to m4/3. m4/3 would be one stop ahead if we are speaking on the same DOF and the same number of pixels per sensors area. Why? If the sensor area is increased 4 times then ...
  • Of course, you are completely right. The characteristic size of Airy disk produced by a lens is explicitly proportional to f-number (f-n), so the lens resolution is just inversely proportional to f-n.
  • The 14-bits ADC dynamic range can't be exceeded if we are speaking on the dynamic range for the whole space-spectral band of the sensor (maximal possible resolution at a single pixel level). Howeve ...
  • Replied in So..
    Below, in the picture you can see that Sony Alpha-7 loses of about 1/3 -0.5 of stop compared to DSLMs. And this is, to my assumption, is the effect of the temperature Fig. from dpreview, low light ...
  • Replied in So..
    Yes, you are right. The smaller sensors are more efficient (I am speaking on an efficiency per unit of area). And this is due to the statistical (random) nature of the noise. When, at the same ...
  • Replied in So..
    At an equal technology and equal temperature the difference between APS-C and m43 is of about 0.5 of stop (base 2 logarithm of square root of the crop-factor). DSLR sensors operate typically at ...
  • The main problem is not connected to the fact that IBIS consume the energy and produces some heat (despite this also gives some negative contribution). The main problem is that the sensor itself ...
  • Agree. Heat is a serious problem in case of IBIS. IBIS is not compatible with the highest quality and reliable videorecording.
  • Yes, the image circle is a property of a lens. But this is the geometrical property that only limits the space area were we are discussing on the optical property such as resolution. It can not be ...
  • Yes, You are free to measure it as you fit. But these measurements will be useless for general purposes if they are system dependent. You certainly do not understand what I am speaking about. Yes, ...
  • No, you can not, if we speak on lens performance! After the multiplying you did the numbers are not more the characteristics of the true lens resolution. The resolution in lines per picture height ...
  • Anders, you have no rights to scale absolute values of resolution (l/mm) by a factor of 2. The lens is an independent optical device, and its optical performance must be evaluated independently on ...
  • Yes, I agree with you. This is evident for everybody who has eyes.
  • The written below is addressed to everyone wishing to know what actually the science tells about influencing the sensor size on its performance. Many at this forum think that signal-to-noise-ratio ...
  • Sorry, my first reply to your post contains typos. The corrected version is as follows. On account of a rather low pixel density in modern sensors I completely agree with your opinion. However, as ...
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