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Forum: Digital Processing, Software, and Printing 01-02-2013, 10:53 AM  
Image transfer from camera to computer
Posted By Adam
Replies: 21
Views: 3,770
Using the cord does have a few advantages, i.e.:
  • Lets you transfer photos even if your pc/laptop doesn't have a card slot

  • May be faster than a cheap card reader (i.e. high-end cameras support USB3 and most others support USB2)

  • Lets you access additional camera features, such as tethering (this depends on the camera make and model)

  • Minimizes wear to card casing and reduces the risk of physically damaging the card

I generally use the card slot in my computer, but lately I've started using the cord too as I've broken one of my cheaper SD cards after taking it out so many times. The casing literally came apart!
Forum: Pentax DSLR Discussion 09-04-2011, 07:25 AM  
Had some time one my hands, so..........
Posted By rparmar
Replies: 31
Views: 4,240
You are wrong and those other "misinformed users" are correct. The aperture specifies the illuminance, which is the luminous flux that makes it to the sensor per unit area. For a given f-stop this is in fact the same across camera systems (ignoring transmittance loss, which we seem to do in still photography, though it's darned important).

Thus a larger sensor does in fact collect more light -- simply multiply the constant flux by the larger area. This is why, all other factors being equal, larger sensors produce better images (define "better" in terms of signal to noise, dynamic range, whatever).

On the contrary, take exactly the same photo with an APS-C camera and a 35mm camera. By "same" I mean perspective, focal length, aperture etc. The result is equivalent to cropping the larger image in the same proportion as the sensor sizes. Using a smaller sensor is like throwing away the extra parts of the image that do not fit into the crop. The term cropping is the simplest way to explain this relationship and is is hence entirely appropriate.

No, perspective is only a matter of where you stand relative to your subject. It has nothing to do with sensors or lenses. I believe you mean "narrower field of view".

Except for those who wish to understand. In this day and age people are swapping lenses between different sensors more than ever. Hence it is important to understand equivalency. I wrote an article on the topic but apparently no-one reads it, or any that preceded them by other authors. :(

I applaud the OP for trying the experiment themselves. :)
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