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p.2 #11 · p.2 #11 · No significant advantage to use 1.6x vs 1.3x crop DSLR with super-tele lens | |
Gonemad wrote:
Perfectly good example. So, let's use your example of two sensors with the same resolution but different sizes. If you agree with jcolwell's picture (see page 1), then you should also agree the bug formed at the focal plane would "fill" more on the smaller sensor than the larger sensor. If you say printer just prints, then if I were to send the image file from the larger sensor to the printer the bug will appear smaller on print as compared to the print from the smaller sensor - same paper and same dpi. In which case, whatever this "crop magnification" is called, it's not imaginary. Is it not? I'm sorry if I fail to see your point......Show more →
You've made several confusions. I'll try to explain but please be forgiving as English is not my native language (and the f...ing keyboard of my tablet is too small !).
If you want to compare photos shot with sensors of different sizes, you have to keep the other parameters "independent". It means the same FoV, the same DoF and the same speed. Let's name the results "equivalent photos".
Whatever is your sensor, it actually digitalizes a portion of reality into a sequence of points (named pixels). This sequence is actually an array whose size is pre-determined by the capabilities of the sensor (and some configuration too). In the end, you've got a picture of X x Y points. These are the points that are sent to the printer, or the monitor. There's no more reference to their origin (sensor A or B, except in the metadata).
So if you take an equivalent picture of a bug with a FF camera and an APS-C camera both having the same resolution, at the end you've got the same picture. No one will be enlarged more. And the bug will have the same size.
Regarding how the magnification is evolving with lenses, there are two factors involved. First is the apparent magnification in the viewfinder : how bigger one sees the subject when changing the focal. The second factor is how many pixels we can put to the subject (the part of the image we want to print). That's another story (but it's interesting too).
Pwew, at least I've reached the end. Dunno which one. Maybe the dark side ?!
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