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Forum: Pentax DSLR Discussion 03-12-2017, 07:34 PM  
understanding the 1.5 crop factor
Posted By pschlute
Replies: 37
Views: 4,674
The point I was trying to make was that it is not the format (aps-c) that gives an apparent "greater reach". In your example the 24mp aps-c camera has a much higher pixel density than the 24mp FF. If we assume that all pixels are created equal (and they clearly are not as you demonstrated in your post), then it is the pixel density which is giving the aps-c camera extra reach and equal resolution, not the format. For example would you say the same above if you substitute my old Pentax DS 6mp aps-c camera ?

I agree in practice it is probably just semantics
Forum: Pentax DSLR Discussion 03-12-2017, 05:29 PM  
understanding the 1.5 crop factor
Posted By pschlute
Replies: 37
Views: 4,674
It is important to understand that the crop factor (versus FF/35mm frame) while giving a "field of view" equivalent to a longer lens, does not have any zoom effect from the lens itself. The subject of your picture, say a person, is rendered by the lens at exactly the same size on both aps-c and FF sensor.

When you view the resultant picture on your computer screen the aps-c image will appear larger (zoomed), but that is simply because there was a smaller field of view recorded, so everything will be enlarged more to fill the same space on your computer screen.

The K1 FF camera allows you to use FF or aps-c size. There is no difference in image quality to using the FF and cropping the image, to using the aps-c setting uncropped. Both resultant images will be produced from the same number of pixels on the sensor.

So aps-c does not give longer "reach" by itself. What will make a difference is the number of pixels/pixel density that the sensor has. For example, assuming all pixels are made equal (!) a 25mp aps-c camera will out resolve a 36mp full frame camera. This will enable you to "enlarge" (crop) your images more and still maintain image quality. But this has nothing to do with the crop factor.
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