John Sheehy

It's not the greatest image in the absolute sense, but what would the subject look like if you had used a DSLR with the same lens from that distance, instead of the Q?  It would have been worthless...

The only reason I don't use my Q more with EOS lenses and an adapter is because it is hard to grip the Q while turning the focus ring, hand-held.  A bigger grip structure would be invaluable, and...

Every camera that I have purchased within the last several years that has a RAW output option includes a full-res JPEG embedded in the RAW. Every camera that I have purchased at any time that...

You know, as much as the administration excuses the situation by claiming that the issue is being worked on, one glaring fact remains: the code deliberately prevents return to the state of the...

So, you used an advertisement from a company whose bottom line is the Yen to prove a scientific hypothesis.  Canon is either ignorant here, or dishonest.  Did you even try what I suggested in the...

Obviously.  I am not the type to confuse real detail with pixelation or aliasing, and I don't like to fool myself by comparing TC options with different levels of subject magnification. Bird...

Are you downsizing the images before printing them?  If you are using the "nearest neighbor" method, stop right here; it is garbage for general use, and is only useful for certain purposes if you...

You might be thinking of the 5D3. 5760 pixels wide (22.12MP in 3:2 aspect) is an integer (3x) multiple of 1920. Binning each color channel in each unique 3x3 tile is not optimal for preventing...

That's not true at all.  The bigger the pixels, the bigger the effect of motion blur.  The thing your model ignores is the fact that when a point of light does cross into the next pixel, the bigger...

Of course, what you are "revealing" when you increase pixel density, is what is really there, as opposed to lower pixel density, which fails to reveal to many people the simple fact that the lower...

Lenses are nowhere near running out of resolution with pixels spaced almost 5 microns apart. Where do all you people who keep saying this come from?

People are creatures of illusion.  Some people just can't wrap their minds around the idea that pixel quality is not image quality; they think that to look at your results, you zoom right in to...

These discussions often are unproductive, because people rarely state what the real issue is. The fact is, if a 2x TC does not interfere with focus, and adds no significant aberrations of its own,...

Now that you make me think of it, I lost 2 8GB cards and their wallet about a year ago, and this would never have happened if these two 8GB cards were 8GB "chapters" in a 32 GB "book", as they'd...

If you can afford it, why not get multiple large cards, and just change them after you have recorded something important? That way, you still have the security of spreading your eggs over multiple...

Most (if not all) ND filters do not attenuate IR as much as they attenuate visible light, and IR appears purplish-magenta to the camera.

Of course; what else could it be?  You've collected the same number of electron charges as if you had one exposure 40x as long.  The difference is, you could have a lot less noise this way than if...

Increasing maximum ISO and decreasing minimum ISO are two completely different things. Any sensor can shoot at any high ISO; the only issue is, the higher you go, the noisier the image gets, until...

One or the other, or something in-between - but not both extremes combined.  At a lower fps, noise should not be greater, and accepting a higher per-pixel noise, speed may be maintained. Heat has...

Not really, the only thing, looking over it, that might be wrong is that I guess you could say that just like a lens itself can be diffraction-limited, the system (including the sensor) could be...