Pass filter

Figure 1.2. A DSLR is a single-lens reflex with a digital image sensor. Mirror and eyepiece allow you to view the image that will fall on the sensor when the mirror flips up and the shutter opens.

Figure 1.2. A DSLR is a single-lens reflex with a digital image sensor. Mirror and eyepiece allow you to view the image that will fall on the sensor when the mirror flips up and the shutter opens.

Figure 1.3. A more elaborate view of what's inside a DSLR. Note computer circuitry ("DIGICII") at right. (Canon USA.)

through the eyepiece, especially since you can magnify the view. Note that some cameras, such as the Olympus E330, offer a live preview from a secondary small sensor, not the main sensor; that kind of live preview is much less useful.

It's hard to guess what the role of DSLRs will be in the history of photography. Future photographers may look back on them as an awkward transitional form, like a fish with legs, soon to be replaced by cameras that don't require mirrors. But at present, DSLRs are the best digital cameras you can get, and they are revolutionizing low-budget astrophotography.

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Digital Cameras For Beginners

Digital Cameras For Beginners

Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.

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