alanr0

ISO won't go below 200 if you have highlight correction enabled. HTH

It is not just pixel area.  Looking more closely, Jack may have over-stated the case, in that he starts from a rather low base.  Nikon sensors of D40 / D70 vintage have full well capacities which...

If you read Jack Hogan's post, the latest DSLR sensors have around a factor of 3 lower base ISO than those from a few years ago.  This is in spite of a roughly two fold increase in quantum...

Do you know why they rely on satellite communications?  Wouldn't optical fibre be a better option, with lower latency and higher capacity.  Clients of cloud services might use satellite if they are...

The 'not a problem' referred to the risk of chain reaction - which I am sure Alex did not expect to be taken seriously. I did suggest that one should be aware of the radiation dose one is exposed...

Not a problem unless Jim has nuclear reactor or linear accelerator in his garage.  You need to irradiate your thorium with neutrons and make enough U233 before you can support a decent chain...

Many of the considerations of sensor size, field of view and magnification are a lot simpler if we figure out what is needed in object space.  One can visulalise this in terms of a point source on...

Yes, it is normalised. I believe it is the height of the sensor, so 15.6 mm for a Nikon D7000, 24 mm for full frame, 13 mm for Micro 4/3 etc. Normalisation does help, but as Jack and I have...

Short answer: very cautiously and with difficulty. With a decent lens near its best aperture, resolution will be limited by the sensor even for today's high Mp DSLRs, so you can't rely directly on...

For macro photography you are often limited by depth of field, and likely to be shooting at f:5.6 or smaller, where the merits of the 50 mm f:2.0 will be less apparent. There are plenty of...

Photozone MTF is measured in line widths / picture height, not line widths / mm.  The full frame D3x has more pixels (24 Mp).  Also you are measuring on a larger scale, so diffraction has less...

Well, an individual photon either gets converted or it doesn't, but what happens to a single photon is not a very precise predictor of what happens to 10,000 photons.  You can run QED calculations...

QE and irradiance both vary with wavelength.  To calculate the average QE, sum the product of QE and spectral irradiance over the wavelength range of interest, and divide by the sum of spectral...

For a Bayer sensor the colour filter array is going to have a big impact of the spectral response.  Within the 500-600 nm range, the green filter transmission will peak near 550 nm and drop by...

FWIW, I came across a reference to Multiple Exciton Generation .  I don't know much about it, and after reading the Wikipidia article, it suspect I may not be alone in this. The aphesa article...

Jack: I suspect it will be difficult to get a reliable indication of penetration depth.  In particular, there may be more going on than simple electron-hole creation at wavelength shorter than 400...

If the photon has sufficient energy, more than one electron can be released.  PhotonTrapper has identified possible mechanisms, such as double electron photoemission.  I don't believe this or other...

https://upload.wikimedia.org/wikipedia/commons/thumb/4/41/Response_silicon_photodiode.svg/500px-Response_silicon_photodiode.svg.png The response is shown in A/W.  For each electron released, the...

Chroma subsampling shouldn't make any difference to the colour scheme.  It ignores the very highest spatial frequencies of the chroma (saturation and hue) components when compressing the image...

I am still with Jim, markusm and kh on this, Gerry.  You have it backwards regarding the sensor gain. If you increase gain, you reduce highlight headroom.  If you also reduce exposure by one stop,...